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Remove passed_count from almostUnwinnable.

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This simplification allows the almostUnwinnable flag to match endgames where the pawns are all on the same flank but are not symmetrical.

STC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 23356 W: 4543 L: 4395 D: 14418
Ptnml(0-2): 346, 2651, 5582, 2707, 392
https://tests.stockfishchess.org/tests/view/5e7b8f57e42a5c3b3ca2eb09

LTC:
LLR: 2.96 (-2.94,2.94) {-1.50,0.50}
Total: 31778 W: 4097 L: 4023 D: 23658
Ptnml(0-2): 199, 2853, 9729, 2891, 217
https://tests.stockfishchess.org/tests/view/5e7ba5ade42a5c3b3ca2eb16

closes https://github.com/official-stockfish/Stockfish/pull/2596

Bench 4777139
This commit is contained in:
xoto10 2020-03-25 16:06:25 +00:00 • committed by Joost VandeVondele
parent 8b229381da
commit c8e8e48b14
1 changed files with 1 additions and 2 deletions
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3
src/evaluate.cpp
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@ -707,8 +707,7 @@ namespace {
bool pawnsOnBothFlanks = (pos.pieces(PAWN) & QueenSide)
&& (pos.pieces(PAWN) & KingSide);
bool almostUnwinnable = !pe->passed_count()
&& outflanking < 0
bool almostUnwinnable = outflanking < 0
&& !pawnsOnBothFlanks;
bool infiltration = rank_of(pos.square<KING>(WHITE)) > RANK_4