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Simplify depth formula based on score improvement

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Simplify depth formula based on score improvement.
This idea was first tried by cj5716

Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 347104 W: 89683 L: 89804 D: 167617
Ptnml(0-2): 1357, 38824, 93307, 38711, 1353
https://tests.stockfishchess.org/tests/view/66378edf9819650825aa75d0

Passed LTC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 63000 W: 15851 L: 15694 D: 31455
Ptnml(0-2): 22, 5396, 20499, 5569, 14
https://tests.stockfishchess.org/tests/view/663c04e5c0b75d7f7b97d461

closes https://github.com/official-stockfish/Stockfish/pull/5225

Bench: 2691699

Co-Authored-By: cj5716 <125858804+cj5716@users.noreply.github.com>
This commit is contained in:
FauziAkram 2024-05-09 02:56:43 +03:00 • committed by Joost VandeVondele
parent 23439e4096
commit 574ad14b32
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1288,7 +1288,7 @@ moves_loop: // When in check, search starts here
else
{
// Reduce other moves if we have found at least one score improvement (~2 Elo)
if (depth > 2 && depth < 13 && beta < 15868 && value > -14630)
if (depth > 2 && depth < 13 && abs(value) < VALUE_TB_WIN_IN_MAX_PLY)
depth -= 2;
assert(depth > 0);