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Reduce more when improving and ttvalue is lower than alpha

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More reduction if position is improving but value from TT doesn't
exceeds alpha but the tt move is excluded.

This idea is based on following LMR condition tuning
https://tests.stockfishchess.org/tests/view/66423a1bf9f4e8fc783cba37
by using only three of the four largest terms P[3], P[18] and P[12].

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 27840 W: 7309 L: 7004 D: 13527
Ptnml(0-2): 85, 3219, 7018, 3502, 96
https://tests.stockfishchess.org/tests/view/6643dc1cbc537f56194508ba

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 191280 W: 48656 L: 48020 D: 94604
Ptnml(0-2): 78, 20979, 52903, 21589, 91
https://tests.stockfishchess.org/tests/view/6643e543bc537f5619451683

closes https://github.com/official-stockfish/Stockfish/pull/5245

Bench: 1430835
This commit is contained in:
Stefan Geschwentner 2024-05-15 04:10:58 +02:00 • committed by Disservin
parent 09dba1f080
commit 9b90cd88f0
1 changed files with 3 additions and 0 deletions
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3
src/search.cpp
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@ -1134,6 +1134,9 @@ moves_loop: // When in check, search starts here
if (PvNode)
r--;
if (improving && ttValue <= alpha && move != ttMove)
r++;
// Increase reduction if next ply has a lot of fail high (~5 Elo)
if ((ss + 1)->cutoffCnt > 3)
r++;