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Introduce one more continuation history

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This one is counter counter counter history - with really low update value and divided by 3 in movepicker unlike the other ones.

Passed STC:
https://tests.stockfishchess.org/tests/view/67861495460e2910c51de720
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 44352 W: 11699 L: 11370 D: 21283
Ptnml(0-2): 156, 5098, 11361, 5383, 178

Passed LTC:
https://tests.stockfishchess.org/tests/view/6786e89e3b8f206a2696b646
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 432660 W: 110355 L: 109207 D: 213098
Ptnml(0-2): 381, 48214, 118039, 49268, 428

closes https://github.com/official-stockfish/Stockfish/pull/5792

Bench: 1491837
This commit is contained in:
Michael Chaly
2025-01-18 03:23:50 +03:00
committed by Joost VandeVondele
parent b392ac76db
commit 7701d0b3c4
2 changed files with 6 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
src/movepick.cpp
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@@ -162,6 +162,7 @@ void MovePicker::score() {
m.value += (*continuationHistory[1])[pc][to];
m.value += (*continuationHistory[2])[pc][to];
m.value += (*continuationHistory[3])[pc][to];
m.value += (*continuationHistory[4])[pc][to] / 3;
m.value += (*continuationHistory[5])[pc][to];
// bonus for checks

13
src/search.cpp
View File

@@ -923,12 +923,9 @@ moves_loop: // When in check, search starts here
&& !is_decisive(beta) && is_valid(ttData.value) && !is_decisive(ttData.value))
return probCutBeta;
const PieceToHistory* contHist[] = {(ss - 1)->continuationHistory,
(ss - 2)->continuationHistory,
(ss - 3)->continuationHistory,
(ss - 4)->continuationHistory,
nullptr,
(ss - 6)->continuationHistory};
const PieceToHistory* contHist[] = {
(ss - 1)->continuationHistory, (ss - 2)->continuationHistory, (ss - 3)->continuationHistory,
(ss - 4)->continuationHistory, (ss - 5)->continuationHistory, (ss - 6)->continuationHistory};
MovePicker mp(pos, ttData.move, depth, &thisThread->mainHistory, &thisThread->lowPlyHistory,
@@ -1844,8 +1841,8 @@ void update_all_stats(const Position& pos,
// Updates histories of the move pairs formed 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) {
static constexpr std::array<ConthistBonus, 5> conthist_bonuses = {
{{1, 1025}, {2, 621}, {3, 325}, {4, 512}, {6, 534}}};
static constexpr std::array<ConthistBonus, 6> conthist_bonuses = {
{{1, 1025}, {2, 621}, {3, 325}, {4, 512}, {5, 122}, {6, 534}}};
for (const auto [i, weight] : conthist_bonuses)
{