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Simplification - Use raw reduction value #6577

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Simplification - Use raw reduction value #6577

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8 changes: 4 additions & 4 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -751,9 +751,9 @@ Value Search::Worker::search(
opponentWorsening = ss->staticEval > -(ss - 1)->staticEval;

// Hindsight adjustment of reductions based on static evaluation difference.
if (priorReduction >= 3 && !opponentWorsening)
if (priorReduction >= 3200 && !opponentWorsening)
depth++;
if (priorReduction >= 2 && depth >= 2 && ss->staticEval + (ss - 1)->staticEval > 173)
if (priorReduction >= 2000 && depth >= 2 && ss->staticEval + (ss - 1)->staticEval > 173)
depth--;

// At non-PV nodes we check for an early TT cutoff
Expand Down Expand Up @@ -929,7 +929,7 @@ Value Search::Worker::search(
// Step 10. Internal iterative reductions
// At sufficient depth, reduce depth for PV/Cut nodes without a TTMove.
// (*Scaler) Making IIR more aggressive scales poorly.
if (!allNode && depth >= 6 && !ttData.move && priorReduction <= 3)
if (!allNode && depth >= 6 && !ttData.move && priorReduction <= 3072)
depth--;

// Step 11. ProbCut
Expand Down Expand Up @@ -1237,7 +1237,7 @@ Value Search::Worker::search(
// std::clamp has been replaced by a more robust implementation.
Depth d = std::max(1, std::min(newDepth - r / 1024, newDepth + 2)) + PvNode;

ss->reduction = newDepth - d;
ss->reduction = r;
value = -search<NonPV>(pos, ss + 1, -(alpha + 1), -alpha, d, true);
ss->reduction = 0;

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