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Extend last non-pawn captures

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Extend last non-pawn captures at principal variation nodes because
they are in general decisive moves with clear endgame result.

STC
http://tests.stockfishchess.org/tests/view/5ddafc86e75c0005326d2140
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 9892 W: 2238 L: 2099 D: 5555

LTC
http://tests.stockfishchess.org/tests/view/5ddb0401e75c0005326d2150
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 30369 W: 5013 L: 4756 D: 20600

Closes https://github.com/official-stockfish/Stockfish/pull/2425

Bench: 5059526
This commit is contained in:
Moez Jellouli
2019-11-24 21:57:09 +01:00
committed by Stéphane Nicolet
parent 87ed9facf1
commit 53125902e4
1 changed files with 6 additions and 0 deletions
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6
src/search.cpp
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@@ -1049,6 +1049,12 @@ moves_loop: // When in check, search starts from here
&& pos.pawn_passed(us, to_sq(move))) && pos.pawn_passed(us, to_sq(move)))
extension = 1; extension = 1;
// Last captures extension
else if ( PvNode
&& PieceValue[EG][pos.captured_piece()] > PawnValueEg
&& pos.non_pawn_material() <= 2 * RookValueMg)
extension = 1;
// Castling extension // Castling extension
if (type_of(move) == CASTLING) if (type_of(move) == CASTLING)
extension = 1; extension = 1;