Mate in 3 · No. 504 · HarderQueen, two bishops and knight
White to play and mate in three.
- 1. Qf7 Kc8 2. Qxd7+ Kb8 3. Qxb7#
Other defences
- 1. Qf7 Kxd8 2. Qxd7#
- 1. Qf7 Kb8 2. Qxd7 Ka8 3. Qc8#
- 1. Qf7 Kb8 2. Qxd7 Nf5 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 Nd5 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 Ng4 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 Nc4 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 Ng2 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 Nc2 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 Nf1 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 Nd1 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 b6 3. Qb7#
- 1. Qf7 Kb8 2. Qxd7 a6 3. Qxb7#
- 1. Qf7 Kb8 2. Qxd7 a5 3. Qxb7#
- 1. Qf7 Kd6 2. Qxd7#
- 1. Qf7 Kb6 2. Qxd7 Nf5 3. Qxb7#
- 1. Qf7 Kb6 2. Qxd7 Nd5 3. Qd6#
- 1. Qf7 Kb6 2. Qxd7 Ng4 3. Qd6#
- 1. Qf7 Kb6 2. Qxd7 Nc4 3. Qxb7#
- 1. Qf7 Kb6 2. Qxd7 Ng2 3. Qd6#
- 1. Qf7 Kb6 2. Qxd7 Nc2 3. Qd6#
- 1. Qf7 Kb6 2. Qxd7 Nf1 3. Qd6#
- 1. Qf7 Kb6 2. Qxd7 Nd1 3. Qd6#
- 1. Qf7 Kb6 2. Qxd7 a6 3. Qxb7#
- 1. Qf7 Kb6 2. Qxd7 a5 3. Qxb7#
- 1. Qf7 Nf5 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Nf5 2. Qxd7+ Kb6 3. Qxb7#
- 1. Qf7 Nd5 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Nd5 2. Qxd7+ Kb6 3. Qd6#
- 1. Qf7 Ng4 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Ng4 2. Qxd7+ Kb6 3. Qd6#
- 1. Qf7 Nc4 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Nc4 2. Qxd7+ Kb6 3. Qxb7#
- 1. Qf7 Ng2 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Ng2 2. Qxd7+ Kb6 3. Qd6#
- 1. Qf7 Nc2 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Nc2 2. Qxd7+ Kb6 3. Qd6#
- 1. Qf7 Nf1 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Nf1 2. Qxd7+ Kb6 3. Qd6#
- 1. Qf7 Nd1 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 Nd1 2. Qxd7+ Kb6 3. Qd6#
- 1. Qf7 b6 2. Qxd7+ Kb8 3. Qb7#
- 1. Qf7 a6 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 a6 2. Qxd7+ Kb6 3. Qxb7#
- 1. Qf7 a5 2. Qxd7+ Kb8 3. Qxb7#
- 1. Qf7 a5 2. Qxd7+ Kb6 3. Qxb7#
Position
- White
- king on b1, queen on b3, bishops on b5 and d2, knight on d8, pawns on a4, b2, b4 and d4
- Black
- king on c7, knight on e3, pawns on a7, b7 and d7