kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-05-01 09:13:08 +00:00
Code Issues Releases Wiki Activity

Scale child node futility pruning with previous move history.

Browse source 
Idea is to do more futility pruning if previous move has bad histories and less if it has good histories.

passed STC
https://tests.stockfishchess.org/tests/view/61e3757fbabab931824e0db7
LLR: 2.96 (-2.94,2.94) <0.00,2.50>
Total: 156816 W: 42282 L: 41777 D: 72757
Ptnml(0-2): 737, 17775, 40913, 18212, 771

passed LTC
https://tests.stockfishchess.org/tests/view/61e43496928632f7813a5535
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 349968 W: 94612 L: 93604 D: 161752
Ptnml(0-2): 300, 35934, 101550, 36858, 342

closes https://github.com/official-stockfish/Stockfish/pull/3903

bench 4720954
This commit is contained in:
Michael Chaly 2022-01-25 02:22:03 +03:00 • committed by Joost VandeVondele
parent bddd38c45e
commit 8b4afcf8f7
1 changed files with 2 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
src/search.cpp
View file

@ -777,7 +777,8 @@ namespace {
// The depth condition is important for mate finding. // The depth condition is important for mate finding.
if ( !ss->ttPv if ( !ss->ttPv
&& depth < 9 && depth < 9
&& eval - futility_margin(depth, improving) >= beta && eval - futility_margin(depth, improving) - (ss-1)->statScore / 256 >= beta
&& eval >= beta
&& eval < 15000) // 50% larger than VALUE_KNOWN_WIN, but smaller than TB wins. && eval < 15000) // 50% larger than VALUE_KNOWN_WIN, but smaller than TB wins.
return eval; return eval;