kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 08:43:09 +00:00
Code Issues Releases Wiki Activity

Remove late irreversible move extension

Browse source 
We simplify away the late irreversible move extension, which
does not seem to be necessary in the current master.

STC
LLR: 2.93 (-2.94,2.94) {-1.50,0.50}
Total: 38584 W: 7464 L: 7342 D: 23778
Ptnml(0-2): 581, 4328, 9365, 4424, 594
https://tests.stockfishchess.org/tests/view/5f1c9669c09435d870cb9de9

LTC
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 27840 W: 3417 L: 3353 D: 21070
Ptnml(0-2): 120, 2315, 8994, 2363, 128
https://tests.stockfishchess.org/tests/view/5f1d2e22c09435d870cb9e21

closes https://github.com/official-stockfish/Stockfish/pull/2836

bench: 4829420
This commit is contained in:
UnaiCorzo 2020-07-25 22:30:05 +02:00 • committed by Stéphane Nicolet
parent f0abde241d
commit 62d3106caa
1 changed files with 1 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
src/search.cpp
View file

@ -1067,7 +1067,7 @@ moves_loop: // When in check, search starts from here
// search of (alpha-s, beta-s), and just one fails high on (alpha, beta), // search of (alpha-s, beta-s), and just one fails high on (alpha, beta),
// then that move is singular and should be extended. To verify this we do // then that move is singular and should be extended. To verify this we do
// a reduced search on all the other moves but the ttMove and if the // a reduced search on all the other moves but the ttMove and if the
// result is lower than ttValue minus a margin then we will extend the ttMove. // result is lower than ttValue minus a margin, then we will extend the ttMove.
if ( depth >= 6 if ( depth >= 6
&& move == ttMove && move == ttMove
&& !rootNode && !rootNode
@ -1131,12 +1131,6 @@ moves_loop: // When in check, search starts from here
if (type_of(move) == CASTLING) if (type_of(move) == CASTLING)
extension = 1; 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 // Add extension to new depth
newDepth += extension; newDepth += extension;