1 files changed, 13 insertions, 0 deletions
diff --git a/src/chess.h b/src/chess.h
index 7ff9994..2e9189a 100755
--- a/src/chess.h
+++ b/src/chess.h
@@ -716,6 +716,19 @@ typedef struct _POSITION
     // bbRookAttacks/bbQueenAttacks that will retire the rest of it.
     BITBOARD bbPawnAttacks[2];
 
+    // First mover of the bbMinorAttacks pair (knight only for now --
+    // bishop is a separate, later step; see board_representation/
+    // EVAL.md section 2). "Which squares does this side's knight(s)
+    // attack" -- computed via g_KnightAttacksBB[c] and OR'd in per
+    // knight, Eval()-scoped scratch like bbPawnAttacks above, cleared
+    // once per Eval() call in _ClearAttackTables since (unlike
+    // bbPawnAttacks) it's accumulated across multiple pieces via |=,
+    // not assigned wholesale. Bishop still writes its own minor-bit
+    // contribution into the old rgSquare[c|8].bvAttacks structure for
+    // now -- every consumer that needs "any minor's attack," not just
+    // knight's, ORs both sources together until bishop converts too.
+    BITBOARD bbMinorAttacks[2];
+
     ULONG uWhiteSqBishopCount[2];          // num bishops on white squares
     SCORE iMaterialBalance[2];             // material balance