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Adjust reduction less at medium depths

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This patch dampens the reduction increase/decrease from statScore at mid-range depths.
Inspired by patterns noticed in this tune: https://tests.stockfishchess.org/tests/view/635188930e5f47a8d0ffe8f5

Passed STC:
https://tests.stockfishchess.org/tests/view/63599dfd6b27ef94d9ec04af
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 87464 W: 23519 L: 23134 D: 40811
Ptnml(0-2): 319, 9599, 23524, 9958, 332

Passed LTC:
https://tests.stockfishchess.org/tests/view/635a73046b27ef94d9ec2313
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 154792 W: 41746 L: 41214 D: 71832
Ptnml(0-2): 79, 15181, 46349, 15703, 84

closes https://github.com/official-stockfish/Stockfish/pull/4213

Bench 4271738
This commit is contained in:
kurt22i
2022-10-30 09:02:48 -04:00
committed by Joost VandeVondele
parent f154ed7a2d
commit d09653df0d
2 changed files with 2 additions and 2 deletions
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AUTHORS
+1 -1
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@@ -91,7 +91,7 @@ Hongzhi Cheng
Ivan Ivec (IIvec) Ivan Ivec (IIvec)
Jacques B. (Timshel) Jacques B. (Timshel)
Jan Ondruš (hxim) Jan Ondruš (hxim)
Jared Kish (Kurtbusch) Jared Kish (Kurtbusch, kurt22i)
Jarrod Torriero (DU-jdto) Jarrod Torriero (DU-jdto)
Jean Gauthier (OuaisBla) Jean Gauthier (OuaisBla)
Jean-Francois Romang (jromang) Jean-Francois Romang (jromang)
src/search.cpp
+1 -1
View File
@@ -1177,7 +1177,7 @@ moves_loop: // When in check, search starts here
- 4433; - 4433;
// Decrease/increase reduction for moves with a good/bad history (~30 Elo) // Decrease/increase reduction for moves with a good/bad history (~30 Elo)
r -= ss->statScore / 13628; r -= ss->statScore / (13628 + 4000 * (depth > 7 && depth < 19));
// In general we want to cap the LMR depth search at newDepth, but when // In general we want to cap the LMR depth search at newDepth, but when
// reduction is negative, we allow this move a limited search extension // reduction is negative, we allow this move a limited search extension