From f1c6f59ae02a9d9db50171a69032dc2409a0e6c6 Mon Sep 17 00:00:00 2001
From: Aargh Rai <aargh.rai+git@gmail.com>
Date: Thu, 16 Jul 2026 15:30:08 +0530
Subject: magic bitboards via AI

---
 src/engine/moves/queen.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

(limited to 'src/engine/moves/queen.c')

diff --git a/src/engine/moves/queen.c b/src/engine/moves/queen.c
index 3e0b8ef..bd3f564 100644
--- a/src/engine/moves/queen.c
+++ b/src/engine/moves/queen.c
@@ -16,17 +16,18 @@ void get_queen_moves(moves_t* moves, position_t position) {
     enemy_pieces = whites(position);
     friendly_queens = position.bitboards[BLACK_QUEEN];
   }
-  
-  __forloop_rook_moves_gen(
-    moves,
-    friendly_queens,
-    friendly_pieces,
-    enemy_pieces
-  );
-  __forloop_bishop_moves_gen(
-    moves,
-    friendly_queens,
-    friendly_pieces,
-    enemy_pieces
-  );
+
+  bitboard_t all_occupied = friendly_pieces | enemy_pieces;
+  bitboard_t queens = friendly_queens;
+  while (queens) {
+    int from = __builtin_ctzll(queens);
+    queens &= queens - 1;
+    bitboard_t attacks = (get_rook_attacks(from, all_occupied) |
+                          get_bishop_attacks(from, all_occupied)) & ~friendly_pieces;
+    while (attacks) {
+      int to = __builtin_ctzll(attacks);
+      attacks &= attacks - 1;
+      add_move(moves, from, to, .flags = ((enemy_pieces >> to) & 1) ? MOVE_CAPTURE : 0);
+    }
+  }
 }
-- 
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