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Corrects a functional change in a cleanup patch.

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This corrects a functional change in
https://github.com/official-stockfish/Stockfish/commit/ddcbacd04d1c860e808202ce8c1206c8acdca627
changing evaluation of KPPvK. Bench remains unchanged at low depth

With this patch, 8/8/5k1p/8/7p/7K/8/8 b - - 1 11 is again correctly evaluated as a draw.

closes https://github.com/official-stockfish/Stockfish/pull/2807

Bench: 4366686
This commit is contained in:
syzygy1
2020-07-11 16:25:34 +02:00
committed by Joost VandeVondele
parent 1f3bd968bb
commit 6c197c3964
1 changed files with 2 additions and 2 deletions
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src/endgame.cpp
+2 -2
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@@ -589,8 +589,8 @@ ScaleFactor Endgame<KPsK>::operator()(const Position& pos) const {
Bitboard strongPawns = pos.pieces(strongSide, PAWN);
// If all pawns are ahead of the king on a single rook file, it's a draw.
if (!((strongPawns & ~FileABB) || (strongPawns & ~FileHBB)) &&
!(strongPawns & ~passed_pawn_span(weakSide, weakKing)))
if ( !(strongPawns & ~(FileABB | FileHBB))
&& !(strongPawns & ~passed_pawn_span(weakSide, weakKing)))
return SCALE_FACTOR_DRAW;
return SCALE_FACTOR_NONE;