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Add offsets to history updates.

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All parameters were tuned on 60k STC games (https://tests.stockfishchess.org/tests/view/6867ef49fe0f2fe354c0c735).

Passed STC:
LLR: 2.98 (-2.94,2.94) <0.00,2.00>
Total: 60576 W: 15794 L: 15444 D: 29338
Ptnml(0-2): 141, 7003, 15642, 7369, 133
https://tests.stockfishchess.org/tests/view/686d5af11451bd6fb830772a

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 58722 W: 15159 L: 14799 D: 28764
Ptnml(0-2): 19, 6259, 16455, 6599, 29
https://tests.stockfishchess.org/tests/view/686f9fd51451bd6fb83081c9

closes https://github.com/official-stockfish/Stockfish/pull/6158

bench: 2706299
This commit is contained in:
Daniel Samek
2025-07-24 10:24:08 +02:00
committed by Joost VandeVondele
parent 793110ca19
commit 2c9a1871ae
1 changed files with 6 additions and 3 deletions
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src/search.cpp
+6 -3
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@@ -1872,13 +1872,16 @@ void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
static constexpr std::array<ConthistBonus, 6> conthist_bonuses = {
{{1, 1092}, {2, 631}, {3, 294}, {4, 517}, {5, 126}, {6, 445}}};
static constexpr int conthist_offsets[6]{71, 106, -22, -20, 29, -74};
for (const auto [i, weight] : conthist_bonuses)
{
// Only update the first 2 continuation histories if we are in check
if (ss->inCheck && i > 2)
break;
if (((ss - i)->currentMove).is_ok())
(*(ss - i)->continuationHistory)[pc][to] << bonus * weight / 1024;
(*(ss - i)->continuationHistory)[pc][to]
<< (bonus * weight / 1024) + conthist_offsets[i - 1];
}
}
@@ -1891,14 +1894,14 @@ void update_quiet_histories(
workerThread.mainHistory[us][move.from_to()] << bonus; // Untuned to prevent duplicate effort
if (ss->ply < LOW_PLY_HISTORY_SIZE)
workerThread.lowPlyHistory[ss->ply][move.from_to()] << bonus * 792 / 1024;
workerThread.lowPlyHistory[ss->ply][move.from_to()] << (bonus * 792 / 1024) + 40;
update_continuation_histories(ss, pos.moved_piece(move), move.to_sq(),
bonus * (bonus > 0 ? 1082 : 784) / 1024);
int pIndex = pawn_structure_index(pos);
workerThread.pawnHistory[pIndex][pos.moved_piece(move)][move.to_sq()]
<< bonus * (bonus > 0 ? 705 : 450) / 1024;
<< (bonus * (bonus > 0 ? 705 : 450) / 1024) + 70;
}
}