1. Nc4+! Ka6 1... Kb5 2. Nd6+ Ka6 3. Nc8 1... Kb4 2. Nxb6 Nxa8 3. Kg6 2. Bb7+!! 2. Nxb6? Ne6 3. Bd5 Nd8 4. Na8 Rxd7+ 5. Kg6 Ka7 6. Be4 Nb7 2... Rxb7 2... Kxb7 3. Nd6+ Ka6 4. Nc8 3. Na5! Kxa5 4. d8=N!! 1/2-1/2