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Tweak usage of correction history

Browse source 
Instead of using linear formula use quadratic one. Maximum impact of
correction history is doubled this way, it breaks even with previous
formula on half of maximum value.

Passed STC:
https://tests.stockfishchess.org/tests/view/659591e579aa8af82b95d7e8
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 225216 W: 57616 L: 57019 D: 110581
Ptnml(0-2): 747, 26677, 57201, 27198, 785

Passed LTC:
https://tests.stockfishchess.org/tests/view/6596ee0b79aa8af82b95f08a
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 73314 W: 18524 L: 18125 D: 36665
Ptnml(0-2): 41, 8159, 19875, 8524, 58

closes https://github.com/official-stockfish/Stockfish/pull/4967

Bench: 1464785
This commit is contained in:
Michael Chaly 2024-01-06 07:42:53 +03:00 • committed by Disservin
parent a5f7386efb
commit 6f9071c643
1 changed files with 14 additions and 4 deletions
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18
src/search.cpp
View file

@ -745,7 +745,9 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
Value newEval =
ss->staticEval
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)] / 32;
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)]
* std::abs(thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)])
/ 16384;
ss->staticEval = eval = to_static_eval(newEval);
@ -759,7 +761,9 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
Value newEval =
ss->staticEval
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)] / 32;
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)]
* std::abs(thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)])
/ 16384;
ss->staticEval = eval = to_static_eval(newEval);
@ -1502,7 +1506,10 @@ Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth) {
Value newEval =
ss->staticEval
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)] / 32;
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)]
* std::abs(
thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)])
/ 16384;
ss->staticEval = bestValue = to_static_eval(newEval);
@ -1519,7 +1526,10 @@ Value qsearch(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth) {
Value newEval =
ss->staticEval
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)] / 32;
+ thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)]
* std::abs(
thisThread->correctionHistory[us][pawn_structure_index<Correction>(pos)])
/ 16384;
ss->staticEval = bestValue = to_static_eval(newEval);
}