1 files changed, 12 insertions, 0 deletions
diff --git a/src/chess.h b/src/chess.h
index 630f090..9b6303d 100755
--- a/src/chess.h
+++ b/src/chess.h
@@ -1652,6 +1652,18 @@ typedef struct _PIECE_DATA
 extern PIECE_DATA g_PieceData[8];
 
 #define PIECE_VALUE_OVER_100(p) (g_PieceData[PIECE_TYPE(p)].uValueOver100)
+
+// _ScoreAllMoves / _ScoreQSearchMoves{InclChecks,NoChecks} (generate.c) bake
+// a flat +120 move-ordering bias plus small MVV-LVA tie-break nudges into
+// winning/even captures'/promotions' iValue -- harmless for sorting, but
+// wrong once the value is used on the eval axis (compared against
+// material-scale margins). Back it out to recover the pure SEE/
+// material-diff value. ComputeMoveScore() (searchsup.c) already does this;
+// _ShouldWeConsiderThisMove() (search.c) reads iValue raw and needs it too.
+#define MOVE_SCORE_ORDERING_BIAS(mv)                                   \
+    (PIECE_VALUE_OVER_100((mv).pCaptured) + 120 +                      \
+     PIECE_VALUE_OVER_100((mv).pPromoted) -                            \
+     PIECE_VALUE_OVER_100((mv).pMoved))
 extern ULONG
 PieceValueOver100(PIECE p);