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Remove attacked pawns from storm evaluation 

STC:
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 54456 W: 11009 L: 10737 D: 32710
Ptnml(0-2): 929, 6326, 12523, 6444, 1006
https://tests.stockfishchess.org/tests/view/5ec962e4404591b2793008a5

LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 62448 W: 9018 L: 8664 D: 44766
Ptnml(0-2): 462, 5928, 18121, 6220, 493
https://tests.stockfishchess.org/tests/view/5ec976a8a586eee45aa2ab40

Non regression STC with "noob_3moves.epd" opening book
LLR: 3.81 (-2.94,2.94) {-1.50,0.50}
Total: 91896 W: 17770 L: 17653 D: 56473
Ptnml(0-2): 1598, 10782, 21124, 10793, 1651
https://tests.stockfishchess.org/tests/view/5ec9b83ea586eee45aa2ab96

closes https://github.com/official-stockfish/Stockfish/pull/2698

Bench 4488597
pull/2702/head
Moez Jellouli 2020-05-24 01:54:37 +02:00 committed by Joost VandeVondele
parent 81c58855e4
commit 7f2c8a2b81
1 changed files with 5 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/pawns.cpp
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@ -33,12 +33,13 @@ namespace {
// Pawn penalties
constexpr Score Backward = S( 9, 24);
constexpr Score BlockedStorm = S(82, 82);
constexpr Score Doubled = S(11, 56);
constexpr Score Isolated = S( 5, 15);
constexpr Score WeakLever = S( 0, 56);
constexpr Score WeakUnopposed = S(13, 27);
constexpr Score BlockedStorm[RANK_NB] = {S( 0, 0), S( 0, 0), S( 76, 78), S(-10, 15), S(-7, 10), S(-4, 6), S(-1, 2)};
// Connected pawn bonus
constexpr int Connected[RANK_NB] = { 0, 7, 8, 12, 29, 48, 86 };
@ -200,8 +201,8 @@ Score Entry::evaluate_shelter(const Position& pos, Square ksq) {
constexpr Color Them = ~Us;
Bitboard b = pos.pieces(PAWN) & ~forward_ranks_bb(Them, ksq);
Bitboard ourPawns = b & pos.pieces(Us);
Bitboard theirPawns = b & pos.pieces(Them);
Bitboard ourPawns = b & pos.pieces(Us) & ~pawnAttacks[Them];
Bitboard theirPawns = b & pos.pieces(Them) & ~pawnAttacks[Us];
Score bonus = make_score(5, 5);
@ -218,7 +219,7 @@ Score Entry::evaluate_shelter(const Position& pos, Square ksq) {
bonus += make_score(ShelterStrength[d][ourRank], 0);
if (ourRank && (ourRank == theirRank - 1))
bonus -= BlockedStorm * int(theirRank == RANK_3);
bonus -= BlockedStorm[theirRank];
else
bonus -= make_score(UnblockedStorm[d][theirRank], 0);
}