b) 1.Bc8?<br />1.Ba6! Ka8 2.Nb2 Ba7 3.Nc4 Bb8 4.Nd2 Ba7 5.Nf3 Bb8 6.Nh4 Ba7 7.Nxg6 Bb8 8. Bb7+ Ka7 9.Ne7 g6 10.Nc8#<br />7... Kb8 8.Nf8 Ka8 9.Bb7+ Kb8 10.Nd7#<br />8... g6 9.Nd7+ Ka8 10.Bb7#<br />6... Ka7 7.Nxg6 ...<br />5... Kb8 6.Nh4 ...<br />4... Ka7 5.Nf3 ...<br />3... Kb8? 4.Ne5 dxe5 5.fxe5 Ka8 6.Bb7+ Kb8 7.e6 f4 8.e7 f3 9.e8=Q#<br />5... f4 6.e6 Ka8 7.Bb7+ ...<br />6... f3 7.e7 Ka8 8.Bb7+ ...<br />7... f2? 8.e8=Q#<br />4... Ka8? 5.Bb7+ Kb8 6.Nd7#<br />2... Ka7 3.Nc4 ...<br />