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WeakUnopposed penalty for backwards on file A or H 

Do not give the WeakUnopposed penalty for backwards on file A or H

The original idea comes from Lolligerhans, and a series of tunings and tests done by Fauzi.

Passed STC:
LLR: 2.96 (-2.94,2.94) {-0.25,1.25}
Total: 140864 W: 28127 L: 27660 D: 85077
Ptnml(0-2): 2529, 16660, 31735, 16831, 2677
https://tests.stockfishchess.org/tests/view/5fe39dec3932f79192d39673

Passed LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.25}
Total: 67568 W: 8993 L: 8590 D: 49985
Ptnml(0-2): 523, 6176, 19983, 6579, 523
https://tests.stockfishchess.org/tests/view/5fe3dd1b3932f79192d39693

closes https://github.com/official-stockfish/Stockfish/pull/3275

Bench: 4109336
pull/3285/head
FauziAkram 2020-12-25 16:19:04 +02:00 committed by Joost VandeVondele
parent 8ec97d161e
commit d21e421ad7
1 changed files with 8 additions and 8 deletions
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16
src/pawns.cpp
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@ -30,11 +30,11 @@ namespace {
#define S(mg, eg) make_score(mg, eg)
// Pawn penalties
constexpr Score Backward = S( 8, 25);
constexpr Score Doubled = S(10, 55);
constexpr Score Isolated = S( 3, 15);
constexpr Score WeakLever = S( 3, 55);
constexpr Score WeakUnopposed = S(13, 25);
constexpr Score Backward = S( 6, 23);
constexpr Score Doubled = S(13, 53);
constexpr Score Isolated = S( 2, 15);
constexpr Score WeakLever = S( 5, 57);
constexpr Score WeakUnopposed = S(16, 22);
// Bonus for blocked pawns at 5th or 6th rank
constexpr Score BlockedPawn[2] = { S(-15, -3), S(-6, 3) };
@ -69,8 +69,8 @@ namespace {
// KingOnFile[semi-open Us][semi-open Them] contains bonuses/penalties
// for king when the king is on a semi-open or open file.
constexpr Score KingOnFile[2][2] = {{ S(-19,12), S(-6, 7) },
{ S( 0, 2), S( 6,-5) }};
constexpr Score KingOnFile[2][2] = {{ S(-21,10), S(-7, 1) },
{ S( 0,-3), S( 9,-4) }};
#undef S
#undef V
@ -172,7 +172,7 @@ namespace {
else if (backward)
score -= Backward
+ WeakUnopposed * !opposed;
+ WeakUnopposed * !opposed * bool(~(FileABB | FileHBB) & s);
if (!support)
score -= Doubled * doubled