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Reduce depth after score improvement at PV nodes #4008

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May 4, 2022
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Reduce depth after score improvement at PV nodes #4008

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11 changes: 11 additions & 0 deletions src/search.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1300,7 +1300,18 @@ namespace {
update_pv(ss->pv, move, (ss+1)->pv);

if (PvNode && value < beta) // Update alpha! Always alpha < beta
{
alpha = value;

// Reduce other moves if we have found at least one score improvement
if ( depth > 2
&& depth < 7
&& beta < VALUE_KNOWN_WIN
&& alpha > -VALUE_KNOWN_WIN)
depth -= 1;

assert(depth > 0);
}
else
{
ss->cutoffCnt++;
Expand Down