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VCN: VC4 stand-pat, VC5 check ordering, PASS in TT #36

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VCN: VC4 stand-pat, VC5 check ordering, PASS in TT #36

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7da6919
Initial plan
Copilot Mar 6, 2026
d170eaa
Add VCN (Victory by Continuous N-level Attack) search mode implementa…
Copilot Mar 6, 2026
100d493
Fix review comments: improve comment clarity in movepick and search code
Copilot Mar 6, 2026
fe8db28
Refactor VCN: VCNLevel enum, move VCNMode to searchcommon.h, VC4/VC5 …
Copilot Mar 7, 2026
ffc8ec9
Fix VCN TT key in vcfsearch, remove vcnAllowB4 params, merge PASS stages
Copilot Mar 7, 2026
3a8a326
Vcn namespace, options consolidation, vcnLevel from parent, PASS/TT fix
Copilot Mar 7, 2026
71d7f28
VC4 stand-pat fix, VC5 check ordering, PASS/TT revert with movepicker…
Copilot Mar 7, 2026
1248ea2
search: fix VCN pass handling in VC4/VCF flow
dhbloo Mar 7, 2026
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8 changes: 5 additions & 3 deletions Rapfi/search/ab/history.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -89,10 +89,12 @@ void HistoryTracker::updateTTMoveStats(Depth depth, Pos ttMove, Value ttValue, V
Color self = board.sideToMove(), oppo = ~self;
bool oppo5 = board.p4Count(oppo, A_FIVE);
bool oppo4 = oppo5 || board.p4Count(oppo, B_FLEX4);
Pattern4 selfP4 = board.cell(ttMove).pattern4[self];
int bonus = statBonus(depth);


// If ttMove is a Pass, we always update the stats, since it might be a refute move in VCN search.
Pattern4 selfP4 = ttMove == Pos::PASS ? NONE : board.cell(ttMove).pattern4[self];
if (!oppo4 && selfP4 < H_FLEX3) {
int bonus = statBonus(depth);

// Bonus for a quiet ttMove that fails high
if (ttValue >= beta)
updateQuietStats(ttMove, bonus);
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