kate/BadFish
1
0
Fork 0
mirror of https://github.com/sockspls/badfish synced 2025-04-30 16:53:09 +00:00
Code Issues Releases Wiki Activity

Increase reduction for captures.

Browse source 
The idea behind this patch is that if static eval is really bad so capturing of current piece on spot will still produce a position with an eval much lower than alpha then our best chance is to create some kind of king attack. So captures without check are mostly worse than captures with check and can be reduced more.

passed STC
https://tests.stockfishchess.org/tests/view/5e8514b44411759d9d098543
LLR: 2.94 (-2.94,2.94) {-0.50,1.50}
Total: 46196 W: 9039 L: 8781 D: 28376
Ptnml(0-2): 750, 5412, 10628, 5446, 862

passed LTC
https://tests.stockfishchess.org/tests/view/5e8530134411759d9d09854c
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 23462 W: 3228 L: 2988 D: 17246
Ptnml(0-2): 186, 2125, 6849, 2405, 166

close https://github.com/official-stockfish/Stockfish/pull/2612

bench 4742598
This commit is contained in:
Vizvezdenec 2020-04-02 06:33:53 +03:00 • committed by Joost VandeVondele
parent 375e4eeaf5
commit c14f4877cf
1 changed files with 10 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
src/search.cpp
View file

@ -1189,10 +1189,17 @@ moves_loop: // When in check, search starts from here
// Decrease/increase reduction for moves with a good/bad history (~30 Elo)
r -= ss->statScore / 16434;
}
else
{
// Increase reduction for captures/promotions if late move and at low depth
if (depth < 8 && moveCount > 2)
r++;
// Increase reduction for captures/promotions if late move and at low depth
else if (depth < 8 && moveCount > 2)
r++;
// Unless giving check, this capture is likely bad
if ( !givesCheck
&& ss->staticEval + PieceValue[EG][pos.captured_piece()] + 200 * depth <= alpha)
r++;
}
Depth d = Utility::clamp(newDepth - r, 1, newDepth);