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Simplify extra continuation history updates

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Passed simplification STC
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 254464 W: 65774 L: 65793 D: 122897
Ptnml(0-2): 699, 30087, 65638, 30150, 658
https://tests.stockfishchess.org/tests/view/68863283966ed85face24a59

Passed simplification LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 144750 W: 37111 L: 37018 D: 70621
Ptnml(0-2): 79, 15676, 40764, 15785, 71
https://tests.stockfishchess.org/tests/view/6886655f7b562f5f7b731359

closes https://github.com/official-stockfish/Stockfish/pull/6189

Bench: 3071078
This commit is contained in:
Daniel Monroe
2025-07-28 20:13:15 +02:00
committed by Joost VandeVondele
parent ab83d320b8
commit 525a5749bc
1 changed files with 1 additions and 4 deletions
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src/search.cpp
+1 -4
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@@ -1856,16 +1856,13 @@ void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {
static constexpr std::array<ConthistBonus, 6> conthist_bonuses = { static constexpr std::array<ConthistBonus, 6> conthist_bonuses = {
{{1, 1108}, {2, 652}, {3, 273}, {4, 572}, {5, 126}, {6, 449}}}; {{1, 1108}, {2, 652}, {3, 273}, {4, 572}, {5, 126}, {6, 449}}};
static constexpr int conthist_offsets[6]{71, 106, -22, -20, 29, -74};
for (const auto [i, weight] : conthist_bonuses) for (const auto [i, weight] : conthist_bonuses)
{ {
// Only update the first 2 continuation histories if we are in check // Only update the first 2 continuation histories if we are in check
if (ss->inCheck && i > 2) if (ss->inCheck && i > 2)
break; break;
if (((ss - i)->currentMove).is_ok()) if (((ss - i)->currentMove).is_ok())
(*(ss - i)->continuationHistory)[pc][to] (*(ss - i)->continuationHistory)[pc][to] << (bonus * weight / 1024) + 80 * (i < 2);
<< (bonus * weight / 1024) + conthist_offsets[i - 1];
} }
} }