战术困难弃子换取局面或战术优势87654321♜♝♛♚♝♜♟♟♟♟♟♟♟♞♞♟♗♙♘♙♙♙♙♙♙♙♖♘♗♕♔♖abcdefghr1bqkb1r/pppp1ppp/2n2n2/4p3/2B1P3/5N2/PPPP1PPP/RNBQK2R w KQkq - 4 4← 闪击底线将杀 →