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Refactor reduction rules

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Refactor reduction rules so that all ttPv/Pv related stuff is in one
rule and the scaling becomes more clear. No functional change

closes https://github.com/official-stockfish/Stockfish/pull/5871

No functional change
This commit is contained in:
Stefan Geschwentner
2025-02-08 20:17:47 +01:00
committed by Disservin
parent 3a0418c0d0
commit 7258567804
1 changed files with 3 additions and 5 deletions
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src/search.cpp
+3 -5
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@@ -1158,10 +1158,8 @@ moves_loop: // When in check, search starts here
// Decrease reduction for PvNodes (*Scaler)
if (ss->ttPv)
r -= 2230 + (ttData.value > alpha) * 925 + (ttData.depth >= depth) * 971;
if (PvNode)
r -= 1013;
r -= 2230 + PvNode * 1013 + (ttData.value > alpha) * 925
+ (ttData.depth >= depth) * (971 + cutNode * 1159);
// These reduction adjustments have no proven non-linear scaling
@@ -1171,7 +1169,7 @@ moves_loop: // When in check, search starts here
// Increase reduction for cut nodes
if (cutNode)
r += 2608 - (ttData.depth >= depth && ss->ttPv) * 1159;
r += 2608;
// Increase reduction if ttMove is a capture but the current move is not a capture
if (ttCapture && !capture)