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Use more continuation histories. #4827

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Use more continuation histories. #4827

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1 change: 1 addition & 0 deletions src/movepick.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -141,6 +141,7 @@ void MovePicker::score() {
m.value = 2 * (*mainHistory)[pos.side_to_move()][from_to(m)];
m.value += 2 * (*continuationHistory[0])[pc][to];
m.value += (*continuationHistory[1])[pc][to];
m.value += (*continuationHistory[2])[pc][to] / 4;
m.value += (*continuationHistory[3])[pc][to];
m.value += (*continuationHistory[5])[pc][to];

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8 changes: 4 additions & 4 deletions src/search.cpp
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Expand Up @@ -918,7 +918,7 @@ namespace {
return probCutBeta;

const PieceToHistory* contHist[] = { (ss-1)->continuationHistory, (ss-2)->continuationHistory,
nullptr , (ss-4)->continuationHistory,
(ss-3)->continuationHistory, (ss-4)->continuationHistory,
nullptr , (ss-6)->continuationHistory };

Move countermove = prevSq != SQ_NONE ? thisThread->counterMoves[pos.piece_on(prevSq)][prevSq] : MOVE_NONE;
Expand Down Expand Up @@ -1511,7 +1511,7 @@ namespace {
}

const PieceToHistory* contHist[] = { (ss-1)->continuationHistory, (ss-2)->continuationHistory,
nullptr , (ss-4)->continuationHistory,
(ss-3)->continuationHistory, (ss-4)->continuationHistory,
nullptr , (ss-6)->continuationHistory };

// Initialize a MovePicker object for the current position, and prepare
Expand Down Expand Up @@ -1768,13 +1768,13 @@ namespace {

void update_continuation_histories(Stack* ss, Piece pc, Square to, int bonus) {

for (int i : {1, 2, 4, 6})
for (int i : {1, 2, 3, 4, 6})
{
// Only update the first 2 continuation histories if we are in check
if (ss->inCheck && i > 2)
break;
if (is_ok((ss-i)->currentMove))
(*(ss-i)->continuationHistory)[pc][to] << bonus;
(*(ss-i)->continuationHistory)[pc][to] << bonus / (1 + 3 * (i == 3));
}
}

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