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Reduce depth after score improvement at PV nodes

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STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.50>
Total: 73760 W: 19590 L: 19244 D: 34926
Ptnml(0-2): 285, 8352, 19292, 8634, 317
https://tests.stockfishchess.org/tests/view/626eb2dc9116b52aa83b73da

LTC:
LLR: 2.93 (-2.94,2.94) <0.50,3.00>
Total: 114400 W: 30561 L: 30111 D: 53728
Ptnml(0-2): 68, 11432, 33785, 11812, 103
https://tests.stockfishchess.org/tests/view/626f730859e9c431e0b10b21

closes https://github.com/official-stockfish/Stockfish/pull/4008

bench: 6174823
This commit is contained in:
Stéphane Nicolet 2022-05-04 07:39:23 +02:00
parent a32d2086bc
commit 9eb7b607cf
1 changed files with 11 additions and 0 deletions
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11
src/search.cpp
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@ -1300,7 +1300,18 @@ moves_loop: // When in check, search starts here
update_pv(ss->pv, move, (ss+1)->pv);
if (PvNode && value < beta) // Update alpha! Always alpha < beta
{
alpha = value;
// Reduce other moves if we have found at least one score improvement
if ( depth > 2
&& depth < 7
&& beta < VALUE_KNOWN_WIN
&& alpha > -VALUE_KNOWN_WIN)
depth -= 1;
assert(depth > 0);
}
else
{
ss->cutoffCnt++;