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Simplify away late irreversible move extension 

Late irreversible move extension seems to be useless now.

STC https://tests.stockfishchess.org/tests/view/5fe75c5c3932f79192d398ca
LLR: 2.93 (-2.94,2.94) {-1.25,0.25}
Total: 196192 W: 18111 L: 18278 D: 159803
Ptnml(0-2): 681, 14097, 68652, 14040, 626

LTC https://tests.stockfishchess.org/tests/view/5fe875e23932f79192d39952
LLR: 2.96 (-2.94,2.94) {-0.75,0.25}
Total: 28080 W: 1105 L: 1053 D: 25922
Ptnml(0-2): 13, 904, 12158, 948, 17

closes https://github.com/official-stockfish/Stockfish/pull/3279

bench: 4144640
pull/3285/head
Unai Corzo 2020-12-27 21:19:19 +01:00 committed by Joost VandeVondele
parent c57c71bf5c
commit 8985c210a1
1 changed files with 0 additions and 6 deletions
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6
src/search.cpp
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@ -1142,12 +1142,6 @@ moves_loop: // When in check, search starts from here
&& pos.non_pawn_material() <= 2 * RookValueMg)
extension = 1;
// Late irreversible move extension
if ( move == ttMove
&& pos.rule50_count() > 80
&& (captureOrPromotion || type_of(movedPiece) == PAWN))
extension = 2;
// Add extension to new depth
newDepth += extension;