debug

src/main.rs

@@ -1,19 +1,91 @@
 use chess_engine::board::Board;
 use chess_engine::movegen::generate_pseudo_legal_moves;
+use chess_engine::movegen::legal_check::is_king_attacked;
 use chess_engine::r#move::*;
 
 
-fn main() {
-    let mut board = Board::from_fen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
-    let mut move_list = MoveList::new();
-    
-    generate_pseudo_legal_moves(&board, &mut move_list);
-
-    for mv in move_list.iter() {
-        board = Board::from_fen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
-        println!("--> making move: {}", mv.to_algebraic());
-        board.make_move(*mv);
-        board.pretty_print_ascii();
-        println!("---------------------");
+fn count_legal_moves_recursive(board: &mut Board, depth: u8) -> u64 {
+    if depth == 0 {
+        return 1_u64;
     }
+
+    let mut list = MoveList::new();
+    generate_pseudo_legal_moves(&board, &mut list);
+
+    let mut leaf_nodes = 0_u64;
+    for mv in list.iter() {
+        let undo_info = board.make_move(*mv);
+        if !is_king_attacked(board) {
+            leaf_nodes += count_legal_moves_recursive(board, depth - 1);
+        }
+        board.undo_move(undo_info);
+    }
+    leaf_nodes
+}
+
+fn perft() {
+    // TalkChess PERFT Tests (by Martin Sedlak)
+    //--Illegal ep move #1
+    let mut board = Board::from_fen("3k4/3p4/8/K1P4r/8/8/8/8 b - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 1134888);
+    
+    //--Illegal ep move #2
+    let mut board = Board::from_fen("8/8/4k3/8/2p5/8/B2P2K1/8 w - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 1015133);
+    
+    //--EP Capture Checks Opponent
+    let mut board = Board::from_fen("8/8/1k6/2b5/2pP4/8/5K2/8 b - d3 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 1440467);
+    
+    //--Short Castling Gives Check
+    let mut board = Board::from_fen("5k2/8/8/8/8/8/8/4K2R w K - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 661072);
+    
+    //--Long Castling Gives Check
+    let mut board = Board::from_fen("3k4/8/8/8/8/8/8/R3K3 w Q - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 803711);
+    
+    //--Castle Rights
+    let mut board = Board::from_fen("r3k2r/1b4bq/8/8/8/8/7B/R3K2R w KQkq - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 4), 1274206);
+    
+    //--Castling Prevented
+    let mut board = Board::from_fen("r3k2r/8/3Q4/8/8/5q2/8/R3K2R b KQkq - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 4), 1720476);
+    
+    //--Promote out of Check
+    let mut board = Board::from_fen("2K2r2/4P3/8/8/8/8/8/3k4 w - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 3821001);
+    
+    //--Discovered Check
+    let mut board = Board::from_fen("8/8/1P2K3/8/2n5/1q6/8/5k2 b - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 5), 1004658);
+    
+    //--Promote to give check
+    let mut board = Board::from_fen("4k3/1P6/8/8/8/8/K7/8 w - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 217342);
+    
+    //--Under Promote to give check
+    let mut board = Board::from_fen("8/P1k5/K7/8/8/8/8/8 w - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 92683);
+    
+    //--Self Stalemate
+    let mut board = Board::from_fen("K1k5/8/P7/8/8/8/8/8 w - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 6), 2217);
+    
+    //--Stalemate & Checkmate
+    let mut board = Board::from_fen("8/k1P5/8/1K6/8/8/8/8 w - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 7), 567584);
+    
+    //--Stalemate & Checkmate
+    let mut board = Board::from_fen("8/8/2k5/5q2/5n2/8/5K2/8 b - - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 4), 23527);
+    
+    // Standard position
+    let mut board = Board::from_fen("rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1");
+    assert_eq!(count_legal_moves_recursive(&mut board, 3), 8902);
+}
+
+fn main() {
+    perft();
 }