1 files changed, 18 insertions, 0 deletions
diff --git a/src/chess.h b/src/chess.h
index 421667f..6b09840 100755
--- a/src/chess.h
+++ b/src/chess.h
@@ -752,6 +752,24 @@ typedef struct _POSITION
     BITBOARD bbRookAttacks[2];
     BITBOARD bbRookXrayAttacks[2];
 
+    // Queen's turn to convert (board_representation/EVAL.md section
+    // 9, 2026-09-05): "which squares does this side's queen(s)
+    // attack," ORed in from the two-pass rook-direction/bishop-
+    // direction magic lookups _EvalQueen's mobility computation
+    // already needs (MOVEGEN_MIGRATION.md's own already-tested
+    // "combined 8-ray table measured slower than reusing the
+    // rook/bishop tables in two passes" finding -- reuse that
+    // structure here too). bbQueenXrayAttacks mirrors
+    // bbRookXrayAttacks/bbMinorXrayAttacks: squares seen past a
+    // friendly queen/rook/bishop battery partner, chained arbitrarily
+    // deep like rook's (not single-hop like bishop's original cut) --
+    // queen's own case table never x-rays past an enemy piece (unlike
+    // rook/bishop), only through friendly battery partners. King
+    // hasn't converted yet and still writes its own bits into the old
+    // bvAttacks structure.
+    BITBOARD bbQueenAttacks[2];
+    BITBOARD bbQueenXrayAttacks[2];
+
     ULONG uWhiteSqBishopCount[2];          // num bishops on white squares
     SCORE iMaterialBalance[2];             // material balance