1. Rc7!  [1. Bg5? Qxg5 2. Nd5 Qg3+ 3. Kxb4 Qg4+ 4. Bc4 Qxd7-+; 1. Be6? Rd4 2. Rxd4 Qxd4 3. Nb5 Qxd2-+; 1. Ne4? Qxe4 2. Bxb4 Qa8+ 3. Ra7 Qxa7+ 4. Ba5 Qxa5#]  1... Kxd2 2. Nb1+!  Rxb1  [2... Ke3 3. Rc3+ Kf2 4. Rc2+ (perpetual check)]  3. Rd7+ [3. Bxb1?  Qg3+ -+]  3... Ke2   [3... Kc2 4. Rc7+ (4. Bxb1+? Kxb1-+) 4... Kd2 5. Rd7+ Kc2 (5... Ke3 6. Bxb1=) 6. Rc7+ (positional draw)]  4. Bxb1 Qh3+ 5. Rd3! =  [5. Bd3+? Kd2-+)
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