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Increase reduction based on the number of best move changes.

Browse source 
Thanks to Vizvezdenec for the PvNode idea and also to vondele the !PvNode idea.

Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 19120 W: 1998 L: 1839 D: 15283
Ptnml(0-2): 76, 1445, 6375, 1572, 92
https://tests.stockfishchess.org/tests/view/5fa8af3e67cbf42301d6a6c9

Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 75584 W: 3454 L: 3205 D: 68925
Ptnml(0-2): 54, 2832, 31771, 3081, 54

closes https://github.com/official-stockfish/Stockfish/pull/3224

Bench: 3595418
This commit is contained in:
lonfom169 2020-11-08 23:43:32 -03:00 • committed by Joost VandeVondele
parent 392b529c3f
commit b5781150ea
2 changed files with 4 additions and 0 deletions
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1
AUTHORS
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@ -19,6 +19,7 @@ Alain Savard (Rocky640)
Alayan Feh (Alayan-stk-2)
Alexander Kure
Alexander Pagel (Lolligerhans)
Alfredo Menezes (lonfom169)
Ali AlZhrani (Cooffe)
Andrew Grant (AndyGrant)
Andrey Neporada (nepal)

3
src/search.cpp
View file

@ -1169,6 +1169,9 @@ moves_loop: // When in check, search starts from here
if (ss->ttPv)
r -= 2;
if (!PvNode && depth > 10 && thisThread->bestMoveChanges <= 2)
r++;
if (moveCountPruning && !formerPv)
r++;