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Simplify move history reduction

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Recent VLTC search tuning has suggested that the depth limit can be increased
by a lot. This patch simplifies away the depth-based bonus from statScore
reduction, making the divisor a constant.

Passed STC:
https://tests.stockfishchess.org/tests/view/656201f5136acbc573549791
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 91520 W: 23130 L: 22967 D: 45423
Ptnml(0-2): 282, 10947, 23141, 11106, 284

Passed LTC:
https://tests.stockfishchess.org/tests/view/6562b43a136acbc57354a581
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 352902 W: 86796 L: 86917 D: 179189
Ptnml(0-2): 190, 40227, 95741, 40100, 193

closes https://github.com/official-stockfish/Stockfish/pull/4886

Bench: 1297179
This commit is contained in:
Muzhen Gaming 2023-11-25 22:16:56 +08:00 • committed by Disservin
parent 13426a93c1
commit 757ae2ff53
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1165,7 +1165,7 @@ moves_loop: // When in check, search starts here
+ (*contHist[3])[movedPiece][to_sq(move)] - 3848; + (*contHist[3])[movedPiece][to_sq(move)] - 3848;
// Decrease/increase reduction for moves with a good/bad history (~25 Elo) // Decrease/increase reduction for moves with a good/bad history (~25 Elo)
r -= ss->statScore / (10216 + 3855 * (depth > 5 && depth < 23)); r -= ss->statScore / 14200;
// Step 17. Late moves reduction / extension (LMR, ~117 Elo) // Step 17. Late moves reduction / extension (LMR, ~117 Elo)
// We use various heuristics for the sons of a node after the first son has // We use various heuristics for the sons of a node after the first son has