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Simplify stalemate detection

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Passed Non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 107392 W: 27959 L: 27818 D: 51615
Ptnml(0-2): 317, 12094, 28735, 12231, 319
https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825

Passed Non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94014 W: 24129 L: 23986 D: 45899
Ptnml(0-2): 47, 9917, 26934, 10064, 45
https://tests.stockfishchess.org/tests/view/68a8f45cb6fb3300203bcb5e

Passed Stalemate 10k:
Elo: 2.22 ± 1.3 (95%) LOS: 100.0%
Total: 10000 W: 4626 L: 4562 D: 812
Ptnml(0-2): 1, 137, 4659, 203, 0
nElo: 12.00 ± 6.8 (95%) PairsRatio: 1.47
https://tests.stockfishchess.org/tests/view/68a65d8ab6fb3300203bc825

Supersedes #6114
Closes #6232

closes https://github.com/official-stockfish/Stockfish/pull/6255

Bench: 2473929
This commit is contained in:
Shawn Xu
2025-08-24 19:50:51 +02:00
committed by Joost VandeVondele
parent 7fa7a36dc6
commit 85f87649bf
3 changed files with 1 additions and 22 deletions
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src/search.cpp
+1 -2
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@@ -1056,8 +1056,7 @@ moves_loop: // When in check, search starts here
depth > 2 && alpha < 0 && pos.non_pawn_material(us) == PieceValue[movedPiece]
&& PieceValue[movedPiece] >= RookValue
// it can't be stalemate if we moved a piece adjacent to the king
&& !(attacks_bb<KING>(pos.square<KING>(us)) & move.from_sq())
&& !mp.can_move_king_or_pawn();
&& !(attacks_bb<KING>(pos.square<KING>(us)) & move.from_sq());
// avoid pruning sacrifices of our last piece for stalemate
if (!mayStalemateTrap)