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Count only the most advanced passed pawn for each file.

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This patch adjusts definition of passed pawns - if there is a pawn of our color in the same file in front of a current pawn it's no longer counts as passed.

passed STC
https://tests.stockfishchess.org/tests/view/5e802037e42a5c3b3ca2ed07
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 215296 W: 41843 L: 41341 D: 132112
Ptnml(0-2): 3688, 25313, 49304, 25495, 3848

passed LTC
https://tests.stockfishchess.org/tests/view/5e806441e42a5c3b3ca2ed2b
LLR: 2.95 (-2.94,2.94) {0.25,1.75}
Total: 74050 W: 9761 L: 9379 D: 54910
Ptnml(0-2): 510, 6838, 22025, 7064, 588

closes https://github.com/official-stockfish/Stockfish/pull/2602

bench: 4902237
This commit is contained in:
Vizvezdenec 2020-03-29 20:04:20 +03:00 • committed by Joost VandeVondele
parent 8c73339a36
commit f2430bf034
1 changed files with 2 additions and 0 deletions
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2
src/pawns.cpp
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@ -124,6 +124,8 @@ namespace {
|| ( stoppers == blocked && r >= RANK_5
&& (shift<Up>(support) & ~(theirPawns | doubleAttackThem)));
passed &= !(forward_file_bb(Us, s) & ourPawns);
// Passed pawns will be properly scored later in evaluation when we have
// full attack info.
if (passed)