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Tweak continuation history bonus dependent on ply.

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This patch is based on following tuning https://tests.stockfishchess.org/tests/view/6648b2eb308cceea45533abe by only using the tuned factors for the continuation history.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 99904 W: 25865 L: 25457 D: 48582
Ptnml(0-2): 281, 11705, 25578, 12101, 287
https://tests.stockfishchess.org/tests/view/6648c136308cceea45533af8

Passed LTC:
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 36402 W: 9362 L: 9039 D: 18001
Ptnml(0-2): 20, 3952, 9951, 4241, 37
https://tests.stockfishchess.org/tests/view/6648ee3cb8fa20e74c39f3fd

closes https://github.com/official-stockfish/Stockfish/pull/5267

Bench: 1917762
This commit is contained in:
Stefan Geschwentner 2024-05-19 10:12:05 +02:00 • committed by Joost VandeVondele
parent 27eb49a221
commit a3bb7e626d
1 changed files with 2 additions and 0 deletions
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2
src/search.cpp
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@ -1779,6 +1779,8 @@ void update_all_stats(const Position& pos,
// by moves at ply -1, -2, -3, -4, and -6 with current move. // by moves at ply -1, -2, -3, -4, and -6 with current move.
void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) { void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
bonus = bonus * (112 * ss->ply + 136) / (159 * ss->ply + 124);
for (int i : {1, 2, 3, 4, 6}) for (int i : {1, 2, 3, 4, 6})
{ {
// Only update the first 2 continuation histories if we are in check // Only update the first 2 continuation histories if we are in check