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Simplify Razoring #5724

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Simplify Razoring #5724

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8 changes: 2 additions & 6 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -775,12 +775,8 @@ Value Search::Worker::search(
// Step 7. Razoring (~1 Elo)
// If eval is really low, check with qsearch if we can exceed alpha. If the
// search suggests we cannot exceed alpha, return a speculative fail low.
if (eval < alpha - 469 - 307 * depth * depth)
{
value = qsearch<NonPV>(pos, ss, alpha - 1, alpha);
if (value < alpha && !is_decisive(value))
return value;
}
if (!PvNode && eval < alpha - 469 - 307 * depth * depth)
return qsearch<NonPV>(pos, ss, alpha - 1, alpha);

// Step 8. Futility pruning: child node (~40 Elo)
// The depth condition is important for mate finding.
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