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Simplify IIR #5062

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Simplify IIR #5062

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904ed0e
Simplify IIR
gahtan-syarif Feb 18, 2024
e8fba34
fixed comment
gahtan-syarif Feb 23, 2024
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8 changes: 3 additions & 5 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -808,13 +808,11 @@ Value Search::Worker::search(
}

// Step 10. Internal iterative reductions (~9 Elo)
// For PV nodes without a ttMove, we decrease depth by 2,
// or by 4 if the current position is present in the TT and
// the stored depth is greater than or equal to the current depth.
// Use qsearch if depth <= 0.
// For PV nodes without a ttMove, we decrease depth by 3.
if (PvNode && !ttMove)
depth -= 2 + 2 * (ss->ttHit && tte->depth() >= depth);
depth -= 3;

// Use qsearch if depth <= 0.
if (depth <= 0)
return qsearch<PV>(pos, ss, alpha, beta);

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