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Remove castling extension

Browse Source 
STC https://tests.stockfishchess.org/tests/view/5f5fa5348fbc1c8a3f476eca
LLR: 2.94 (-2.94,2.94) {-1.25,0.25}
Total: 38520 W: 4713 L: 4610 D: 29197
Ptnml(0-2): 233, 3486, 11734, 3559, 248

LTC https://tests.stockfishchess.org/tests/view/5f62166a912c15f19854b806
LLR: 2.93 (-2.94,2.94) {-0.75,0.25}
Total: 48024 W: 2673 L: 2600 D: 42751
Ptnml(0-2): 64, 2247, 19316, 2322, 63

closes https://github.com/official-stockfish/Stockfish/pull/3128

bench: 3818400
This commit is contained in:
Unai Corzo
2020-09-16 19:14:32 +02:00
committed by Joost VandeVondele
parent df43805953
commit 0ca93c5b94
1 changed files with 0 additions and 5 deletions
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5
src/search.cpp
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@@ -1127,11 +1127,6 @@ moves_loop: // When in check, search starts from here
&& pos.non_pawn_material() <= 2 * RookValueMg)
extension = 1;
// Castling extension
if ( type_of(move) == CASTLING
&& popcount(pos.pieces(us) & ~pos.pieces(PAWN) & (to_sq(move) & KingSide ? KingSide : QueenSide)) <= 2)
extension = 1;
// Late irreversible move extension
if ( move == ttMove
&& pos.rule50_count() > 80