Queen, rook and two knights

• 1. Qxb8 Qc8 2. Qxc8 Ka7 3. Qxb7#

Other defences

• 1. Qxb8 Nd8 2. Qa7#
• 1. Qxb8 Nbd6 2. Qa7#
• 1. Qxb8 Nc5 2. Qa7#
• 1. Qxb8 Nba5 2. Qa7#
• 1. Qxb8 Qc8 2. Qxc8 Ka5 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 Nd6 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 Ne5 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 Na5 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 Ne3 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 Nxd2 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 Nb2 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 b3 3. Qa8#
• 1. Qxb8 Qc8 2. Qxc8 a2 3. Qa8#
• 1. Qxb8 Qxd7 2. Qa8#
• 1. Qxb8 Qc7 2. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 Nd8 3. Qa7#
• 1. Qxb8 Qh6+ 2. Nxh6 Nbd6 3. Qa7#
• 1. Qxb8 Qh6+ 2. Nxh6 Nc5 3. Qa7#
• 1. Qxb8 Qh6+ 2. Nxh6 Nba5 3. Qa7#
• 1. Qxb8 Qh6+ 2. Nxh6 Ka5 3. Qa7#
• 1. Qxb8 Qh6+ 2. Nxh6 Ncd6 3. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 Ne5 3. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 Nca5 3. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 Ne3 3. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 Nxd2 3. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 Nb2 3. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 b3 3. Qa8#
• 1. Qxb8 Qh6+ 2. Nxh6 a2 3. Qa8#
• 1. Qxb8 Qg6 2. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 Nd8 3. Qa7#
• 1. Qxb8 Qf6+ 2. Nxf6 Nbd6 3. Qa7#
• 1. Qxb8 Qf6+ 2. Nxf6 Nc5 3. Qa7#
• 1. Qxb8 Qf6+ 2. Nxf6 Nba5 3. Qa7#
• 1. Qxb8 Qf6+ 2. Nxf6 Ka5 3. Qa7#
• 1. Qxb8 Qf6+ 2. Nxf6 Ncd6 3. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 Ne5 3. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 Nca5 3. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 Ne3 3. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 Nxd2 3. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 Nb2 3. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 b3 3. Qa8#
• 1. Qxb8 Qf6+ 2. Nxf6 a2 3. Qa8#
• 1. Qxb8 Qe6 2. Qa8#
• 1. Qxb8 Qd6 2. Qa8#
• 1. Qxb8 Qd5 2. Qa8#
• 1. Qxb8 Qc5 2. Qa8#
• 1. Qxb8 Qe4 2. Qa8#
• 1. Qxb8 Qf3 2. Qa8#
• 1. Qxb8 Qg2 2. Qa8#
• 1. Qxb8 Qh1 2. Qa8#
• 1. Qxb8 Ka5 2. Qa7#
• 1. Qxb8 Ncd6 2. Qa8#
• 1. Qxb8 Ne5 2. Qa8#
• 1. Qxb8 Nca5 2. Qa8#
• 1. Qxb8 Ne3 2. Qa8#
• 1. Qxb8 Nxd2 2. Qa8#
• 1. Qxb8 Nb2 2. Qa8#
• 1. Qxb8 b3 2. Qa8#
• 1. Qxb8 a2 2. Qa8#