kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-29 16:23:09 +00:00
Code Issues Releases Wiki Activity

Introduce pre-qsearch ttmove extensions at pv nodes

Browse source 
The idea is that we are about to dive into qsearch (next search depth is <= 0)
but since we have the move in transposition table we should extend that move
and evaluate it with more precise search - because branch seems important.

Passed STC:
https://tests.stockfishchess.org/tests/view/6699d2564ff211be9d4ec488
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 83104 W: 21789 L: 21401 D: 39914
Ptnml(0-2): 293, 9748, 21128, 10044, 339

Passed LTC:
https://tests.stockfishchess.org/tests/view/669b3f1a4ff211be9d4ec602
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 136098 W: 34636 L: 34111 D: 67351
Ptnml(0-2): 105, 14882, 37550, 15407, 105

closes https://github.com/official-stockfish/Stockfish/pull/5512

bench 1526129
This commit is contained in:
Michael Chaly 2024-07-23 16:36:49 +03:00 • committed by Joost VandeVondele
parent 985b9fd7b0
commit 836154acb5
1 changed files with 4 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
src/search.cpp
View file

@ -1206,6 +1206,10 @@ moves_loop: // When in check, search starts here
(ss + 1)->pv = pv;
(ss + 1)->pv[0] = Move::none();
// Extend move from transposition table if we are about to dive into qsearch.
if (move == ttData.move && ss->ply <= thisThread->rootDepth * 2)
newDepth = std::max(newDepth, 1);
value = -search<PV>(pos, ss + 1, -beta, -alpha, newDepth, false);
}