2008-08-31 23:59:13 -06:00
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/*
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2008-10-19 10:56:28 -06:00
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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2021-01-08 09:04:23 -07:00
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Copyright (C) 2004-2021 The Stockfish developers (see AUTHORS file)
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2008-08-31 23:59:13 -06:00
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2008-10-19 10:56:28 -06:00
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Stockfish is free software: you can redistribute it and/or modify
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2008-08-31 23:59:13 -06:00
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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2008-09-23 16:32:53 -06:00
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2008-10-19 10:56:28 -06:00
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Stockfish is distributed in the hope that it will be useful,
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2008-08-31 23:59:13 -06:00
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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2008-09-23 16:32:53 -06:00
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2008-08-31 23:59:13 -06:00
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <cassert>
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2014-12-30 02:31:50 -07:00
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#include <cstring> // For std::memset
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2008-08-31 23:59:13 -06:00
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#include "material.h"
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2014-12-30 02:31:50 -07:00
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#include "thread.h"
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2008-08-31 23:59:13 -06:00
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2009-07-26 10:42:48 -06:00
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using namespace std;
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2008-08-31 23:59:13 -06:00
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2021-02-26 02:02:13 -07:00
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namespace Stockfish {
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2008-08-31 23:59:13 -06:00
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namespace {
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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#define S(mg, eg) make_score(mg, eg)
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2008-08-31 23:59:13 -06:00
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2014-12-27 02:47:21 -07:00
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// Polynomial material imbalance parameters
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2009-11-15 01:35:22 -07:00
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2021-01-12 06:59:51 -07:00
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// One Score parameter for each pair (our piece, another of our pieces)
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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constexpr Score QuadraticOurs[][PIECE_TYPE_NB] = {
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2021-01-12 06:59:51 -07:00
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// OUR PIECE 2
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// bishop pair pawn knight bishop rook queen
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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{S(1419, 1455) }, // Bishop pair
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{S( 101, 28), S( 37, 39) }, // Pawn
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2021-01-12 06:59:51 -07:00
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{S( 57, 64), S(249, 187), S(-49, -62) }, // Knight OUR PIECE 1
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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{S( 0, 0), S(118, 137), S( 10, 27), S( 0, 0) }, // Bishop
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{S( -63, -68), S( -5, 3), S(100, 81), S(132, 118), S(-246, -244) }, // Rook
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{S(-210, -211), S( 37, 14), S(147, 141), S(161, 105), S(-158, -174), S(-9,-31) } // Queen
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2013-03-13 17:23:29 -06:00
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};
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2009-07-20 02:56:21 -06:00
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2021-01-12 06:59:51 -07:00
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// One Score parameter for each pair (our piece, their piece)
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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constexpr Score QuadraticTheirs[][PIECE_TYPE_NB] = {
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2021-01-12 06:59:51 -07:00
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// THEIR PIECE
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// bishop pair pawn knight bishop rook queen
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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{ }, // Bishop pair
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{S( 33, 30) }, // Pawn
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2021-01-12 06:59:51 -07:00
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{S( 46, 18), S(106, 84) }, // Knight OUR PIECE
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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{S( 75, 35), S( 59, 44), S( 60, 15) }, // Bishop
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{S( 26, 35), S( 6, 22), S( 38, 39), S(-12, -2) }, // Rook
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{S( 97, 93), S(100, 163), S(-58, -91), S(112, 192), S(276, 225) } // Queen
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2017-07-08 15:07:25 -06:00
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};
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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#undef S
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2013-12-02 11:04:09 -07:00
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// Endgame evaluation and scaling functions are accessed directly and not through
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2014-01-05 17:21:44 -07:00
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// the function maps because they correspond to more than one material hash key.
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2014-12-30 02:31:50 -07:00
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Endgame<KXK> EvaluateKXK[] = { Endgame<KXK>(WHITE), Endgame<KXK>(BLACK) };
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2011-04-11 10:12:41 -06:00
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2011-08-21 13:11:37 -06:00
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Endgame<KBPsK> ScaleKBPsK[] = { Endgame<KBPsK>(WHITE), Endgame<KBPsK>(BLACK) };
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Endgame<KQKRPs> ScaleKQKRPs[] = { Endgame<KQKRPs>(WHITE), Endgame<KQKRPs>(BLACK) };
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Endgame<KPsK> ScaleKPsK[] = { Endgame<KPsK>(WHITE), Endgame<KPsK>(BLACK) };
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Endgame<KPKP> ScaleKPKP[] = { Endgame<KPKP>(WHITE), Endgame<KPKP>(BLACK) };
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2010-04-26 06:43:03 -06:00
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2015-02-07 02:09:56 -07:00
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// Helper used to detect a given material distribution
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bool is_KXK(const Position& pos, Color us) {
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return !more_than_one(pos.pieces(~us))
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&& pos.non_pawn_material(us) >= RookValueMg;
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2010-04-26 03:42:46 -06:00
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}
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Renaming some variables in code
Implements renaming suggestions by Marco Costalba, Günther Demetz,
Gontran Lemaire, Ronald de Man, Stéphane Nicolet, Alain Savard,
Joost VandeVondele, Jerry Donald Watson, Mike Whiteley, xoto10,
and I hope that I haven't forgotten anybody.
Perpetual renaming thread for suggestions:
https://github.com/official-stockfish/Stockfish/issues/1426
No functional change.
2018-03-15 03:44:26 -06:00
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bool is_KBPsK(const Position& pos, Color us) {
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2015-02-07 02:09:56 -07:00
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return pos.non_pawn_material(us) == BishopValueMg
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2021-03-19 12:43:25 -06:00
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&& pos.count<PAWN>(us) >= 1;
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2010-04-26 03:42:46 -06:00
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}
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2015-02-07 02:09:56 -07:00
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bool is_KQKRPs(const Position& pos, Color us) {
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return !pos.count<PAWN>(us)
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&& pos.non_pawn_material(us) == QueenValueMg
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&& pos.count<ROOK>(~us) == 1
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&& pos.count<PAWN>(~us) >= 1;
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2010-04-26 03:42:46 -06:00
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}
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2008-08-31 23:59:13 -06:00
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2020-06-24 14:19:58 -06:00
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2013-12-02 11:04:09 -07:00
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/// imbalance() calculates the imbalance by comparing the piece count of each
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2012-12-16 04:00:54 -07:00
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/// piece type for both colors.
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2020-06-24 14:19:58 -06:00
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2012-12-16 04:00:54 -07:00
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template<Color Us>
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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Score imbalance(const int pieceCount[][PIECE_TYPE_NB]) {
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2012-12-16 04:00:54 -07:00
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2020-03-30 14:45:35 -06:00
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constexpr Color Them = ~Us;
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2012-12-16 04:00:54 -07:00
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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Score bonus = SCORE_ZERO;
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2012-12-16 04:00:54 -07:00
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2017-11-18 03:24:23 -07:00
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// Second-degree polynomial material imbalance, by Tord Romstad
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2014-06-20 15:15:31 -06:00
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for (int pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; ++pt1)
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2012-12-16 04:00:54 -07:00
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{
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2014-06-20 15:15:31 -06:00
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if (!pieceCount[Us][pt1])
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2012-12-16 04:00:54 -07:00
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continue;
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2020-06-24 14:19:58 -06:00
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int v = QuadraticOurs[pt1][pt1] * pieceCount[Us][pt1];
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2012-12-16 04:00:54 -07:00
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2020-06-24 14:19:58 -06:00
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for (int pt2 = NO_PIECE_TYPE; pt2 < pt1; ++pt2)
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2014-12-30 02:31:50 -07:00
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v += QuadraticOurs[pt1][pt2] * pieceCount[Us][pt2]
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+ QuadraticTheirs[pt1][pt2] * pieceCount[Them][pt2];
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2012-12-16 04:00:54 -07:00
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2014-06-20 15:15:31 -06:00
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bonus += pieceCount[Us][pt1] * v;
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2012-12-16 04:00:54 -07:00
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}
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2014-04-03 02:38:11 -06:00
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2014-06-20 15:15:31 -06:00
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return bonus;
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2012-12-16 04:00:54 -07:00
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}
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2011-04-11 10:12:41 -06:00
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} // namespace
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2009-07-17 11:16:20 -06:00
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2012-12-16 04:00:54 -07:00
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namespace Material {
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2008-08-31 23:59:13 -06:00
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2020-06-24 14:19:58 -06:00
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2014-12-30 02:31:50 -07:00
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/// Material::probe() looks up the current position's material configuration in
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/// the material hash table. It returns a pointer to the Entry if the position
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/// is found. Otherwise a new Entry is computed and stored there, so we don't
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/// have to recompute all when the same material configuration occurs again.
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2008-08-31 23:59:13 -06:00
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2014-12-30 02:31:50 -07:00
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Entry* probe(const Position& pos) {
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2008-10-27 12:07:48 -06:00
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2011-12-25 03:50:59 -07:00
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Key key = pos.material_key();
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2014-12-30 02:31:50 -07:00
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Entry* e = pos.this_thread()->materialTable[key];
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2008-08-31 23:59:13 -06:00
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2012-03-31 05:15:57 -06:00
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if (e->key == key)
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return e;
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2008-08-31 23:59:13 -06:00
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2013-07-13 09:21:24 -06:00
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std::memset(e, 0, sizeof(Entry));
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2012-03-31 05:15:57 -06:00
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e->key = key;
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e->factor[WHITE] = e->factor[BLACK] = (uint8_t)SCALE_FACTOR_NORMAL;
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2017-07-09 03:45:31 -06:00
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Value npm_w = pos.non_pawn_material(WHITE);
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Value npm_b = pos.non_pawn_material(BLACK);
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2020-07-11 08:59:33 -06:00
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Value npm = std::clamp(npm_w + npm_b, EndgameLimit, MidgameLimit);
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2017-07-09 03:45:31 -06:00
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// Map total non-pawn material into [PHASE_ENDGAME, PHASE_MIDGAME]
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e->gamePhase = Phase(((npm - EndgameLimit) * PHASE_MIDGAME) / (MidgameLimit - EndgameLimit));
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2009-11-13 05:29:04 -07:00
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2013-12-02 11:04:09 -07:00
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// Let's look if we have a specialized evaluation function for this particular
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// material configuration. Firstly we look for a fixed configuration one, then
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// for a generic one if the previous search failed.
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2019-05-15 02:41:58 -06:00
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if ((e->evaluationFunction = Endgames::probe<Value>(key)) != nullptr)
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2012-03-31 05:15:57 -06:00
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return e;
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2008-10-28 12:30:57 -06:00
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2019-07-16 06:08:58 -06:00
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for (Color c : { WHITE, BLACK })
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2015-02-07 02:09:56 -07:00
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if (is_KXK(pos, c))
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{
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e->evaluationFunction = &EvaluateKXK[c];
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return e;
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}
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2011-04-11 03:32:55 -06:00
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2014-12-30 02:31:50 -07:00
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// OK, we didn't find any special evaluation function for the current material
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// configuration. Is there a suitable specialized scaling function?
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2019-05-15 02:41:58 -06:00
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const auto* sf = Endgames::probe<ScaleFactor>(key);
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2008-11-01 04:38:30 -06:00
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2019-03-31 03:47:36 -06:00
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if (sf)
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2008-10-27 14:54:39 -06:00
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{
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2017-06-04 03:03:23 -06:00
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e->scalingFunction[sf->strongSide] = sf; // Only strong color assigned
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2012-03-31 05:15:57 -06:00
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return e;
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2008-08-31 23:59:13 -06:00
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}
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2014-12-30 02:31:50 -07:00
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// We didn't find any specialized scaling function, so fall back on generic
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// ones that refer to more than one material distribution. Note that in this
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// case we don't return after setting the function.
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2019-07-16 06:08:58 -06:00
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for (Color c : { WHITE, BLACK })
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2015-02-07 02:09:56 -07:00
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{
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Renaming some variables in code
Implements renaming suggestions by Marco Costalba, Günther Demetz,
Gontran Lemaire, Ronald de Man, Stéphane Nicolet, Alain Savard,
Joost VandeVondele, Jerry Donald Watson, Mike Whiteley, xoto10,
and I hope that I haven't forgotten anybody.
Perpetual renaming thread for suggestions:
https://github.com/official-stockfish/Stockfish/issues/1426
No functional change.
2018-03-15 03:44:26 -06:00
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if (is_KBPsK(pos, c))
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2015-02-07 02:09:56 -07:00
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e->scalingFunction[c] = &ScaleKBPsK[c];
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2008-10-27 14:54:39 -06:00
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2015-02-07 02:09:56 -07:00
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else if (is_KQKRPs(pos, c))
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e->scalingFunction[c] = &ScaleKQKRPs[c];
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}
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2008-10-27 14:54:39 -06:00
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2014-12-30 02:31:50 -07:00
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if (npm_w + npm_b == VALUE_ZERO && pos.pieces(PAWN)) // Only pawns on the board
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2008-10-27 14:54:39 -06:00
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{
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2013-06-16 03:59:40 -06:00
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if (!pos.count<PAWN>(BLACK))
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2008-10-27 14:54:39 -06:00
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{
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2013-06-16 03:59:40 -06:00
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assert(pos.count<PAWN>(WHITE) >= 2);
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2014-12-30 02:31:50 -07:00
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2012-03-31 05:15:57 -06:00
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e->scalingFunction[WHITE] = &ScaleKPsK[WHITE];
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2008-10-27 14:54:39 -06:00
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}
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2013-06-16 03:59:40 -06:00
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else if (!pos.count<PAWN>(WHITE))
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2008-10-27 14:54:39 -06:00
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{
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2013-06-16 03:59:40 -06:00
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assert(pos.count<PAWN>(BLACK) >= 2);
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2014-12-30 02:31:50 -07:00
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2012-03-31 05:15:57 -06:00
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e->scalingFunction[BLACK] = &ScaleKPsK[BLACK];
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2008-10-27 14:54:39 -06:00
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}
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2013-06-16 03:59:40 -06:00
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else if (pos.count<PAWN>(WHITE) == 1 && pos.count<PAWN>(BLACK) == 1)
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2008-10-27 14:54:39 -06:00
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{
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2009-08-13 04:45:35 -06:00
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// This is a special case because we set scaling functions
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// for both colors instead of only one.
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2012-03-31 05:15:57 -06:00
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e->scalingFunction[WHITE] = &ScaleKPKP[WHITE];
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e->scalingFunction[BLACK] = &ScaleKPKP[BLACK];
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2008-10-27 14:54:39 -06:00
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}
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2008-08-31 23:59:13 -06:00
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}
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2014-12-30 02:31:50 -07:00
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// Zero or just one pawn makes it difficult to win, even with a small material
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// advantage. This catches some trivial draws like KK, KBK and KNK and gives a
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// drawish scale factor for cases such as KRKBP and KmmKm (except for KBBKN).
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2013-06-16 03:59:40 -06:00
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if (!pos.count<PAWN>(WHITE) && npm_w - npm_b <= BishopValueMg)
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2014-12-30 02:31:50 -07:00
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e->factor[WHITE] = uint8_t(npm_w < RookValueMg ? SCALE_FACTOR_DRAW :
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2015-10-05 20:48:47 -06:00
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npm_b <= BishopValueMg ? 4 : 14);
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2011-04-11 06:50:56 -06:00
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2013-06-16 03:59:40 -06:00
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if (!pos.count<PAWN>(BLACK) && npm_b - npm_w <= BishopValueMg)
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2014-12-30 02:31:50 -07:00
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e->factor[BLACK] = uint8_t(npm_b < RookValueMg ? SCALE_FACTOR_DRAW :
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2015-10-05 20:48:47 -06:00
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npm_w <= BishopValueMg ? 4 : 14);
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2011-04-11 03:32:55 -06:00
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2013-09-04 22:34:13 -06:00
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// Evaluate the material imbalance. We use PIECE_TYPE_NONE as a place holder
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2013-12-02 11:04:09 -07:00
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// for the bishop pair "extended piece", which allows us to be more flexible
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2011-04-11 03:32:55 -06:00
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// in defining bishop pair bonuses.
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2018-03-18 16:38:58 -06:00
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const int pieceCount[COLOR_NB][PIECE_TYPE_NB] = {
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2013-09-04 22:34:13 -06:00
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{ pos.count<BISHOP>(WHITE) > 1, pos.count<PAWN>(WHITE), pos.count<KNIGHT>(WHITE),
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pos.count<BISHOP>(WHITE) , pos.count<ROOK>(WHITE), pos.count<QUEEN >(WHITE) },
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{ pos.count<BISHOP>(BLACK) > 1, pos.count<PAWN>(BLACK), pos.count<KNIGHT>(BLACK),
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pos.count<BISHOP>(BLACK) , pos.count<ROOK>(BLACK), pos.count<QUEEN >(BLACK) } };
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2010-11-23 01:09:15 -07:00
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New Imbalance Tables Tweak
Imbalance tables tweaked to contain MiddleGame and Endgame values, instead of a single value.
The idea started from Fisherman, which requested my help to tune the values back in June/July,
so I tuned the values back then, and we were able to accomplish good results,
but not enough to pass both STC and LTC tests.
So after the recent changes, I decided to give it another shot, and I am glad that it was a successful attempt.
A special thanks goes also to mstembera, which notified me a simple way to let the patch perform a little better.
Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 115976 W: 23124 L: 22695 D: 70157
Ptnml(0-2): 2074, 13652, 26285, 13725, 2252
https://tests.stockfishchess.org/tests/view/5fc92d2d42a050a89f02ccc8
Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 156304 W: 20617 L: 20024 D: 115663
Ptnml(0-2): 1138, 14647, 46084, 15050, 1233
https://tests.stockfishchess.org/tests/view/5fc9fee142a050a89f02cd3e
closes https://github.com/official-stockfish/Stockfish/pull/3255
Bench: 4278746
2020-12-07 10:28:47 -07:00
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e->score = (imbalance<WHITE>(pieceCount) - imbalance<BLACK>(pieceCount)) / 16;
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2012-03-31 05:15:57 -06:00
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return e;
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2011-04-11 03:32:55 -06:00
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}
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2012-12-16 04:00:54 -07:00
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} // namespace Material
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2021-02-26 02:02:13 -07:00
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} // namespace Stockfish
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