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Simplify new cmh pruning thresholds by using directly a quadratic formula.

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This decouples also the stat bonus updates from the threshold which creates less dependencies for tuning of stat bonus parameters.
Perhaps a further fine tuning of the now separated coefficients for constHist[0] and constHist[1] could give further gains.

STC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 78384 W: 6134 L: 6090 D: 66160
Ptnml(0-2): 207, 5013, 28705, 5063, 204
https://tests.stockfishchess.org/tests/view/6106d235afad2da4f4ae3d4b

LTC:
LLR: 2.93 (-2.94,2.94) <-2.50,0.50>
Total: 38176 W: 1149 L: 1095 D: 35932
Ptnml(0-2): 6, 1000, 17030, 1038, 14
https://tests.stockfishchess.org/tests/view/6107a080afad2da4f4ae3def

closes https://github.com/official-stockfish/Stockfish/pull/3639

Bench: 5098146
This commit is contained in:
Stefan Geschwentner 2021-08-03 16:32:48 +02:00 • committed by Joost VandeVondele
parent 31ebd918ea
commit 5cd42f6b0b
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -1017,8 +1017,8 @@ moves_loop: // When in check, search starts here
{
// Continuation history based pruning (~20 Elo)
if ( lmrDepth < 5
&& (*contHist[0])[movedPiece][to_sq(move)] < (depth == 1 ? 0 : -stat_bonus(depth-1))
&& (*contHist[1])[movedPiece][to_sq(move)] < (depth == 1 ? 0 : -stat_bonus(depth-1)))
&& (*contHist[0])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth
&& (*contHist[1])[movedPiece][to_sq(move)] < 23 - 23 * depth * depth)
continue;
// Futility pruning: parent node (~5 Elo)