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Decrease depth for cutnodes with no tt move. #3697

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Decrease depth for cutnodes with no tt move. #3697

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7 changes: 6 additions & 1 deletion src/search.cpp
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Expand Up @@ -903,12 +903,17 @@ namespace {
ss->ttPv = ttPv;
}

// Step 10. If the position is not in TT, decrease depth by 2
// Step 10. If the position is not in TT, decrease depth by 2 or 1 depending on node type
if ( PvNode
&& depth >= 6
&& !ttMove)
depth -= 2;

if ( cutNode
&& depth >= 9
&& !ttMove)
depth--;

moves_loop: // When in check, search starts here

ttCapture = ttMove && pos.capture_or_promotion(ttMove);
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