- 1. Qxb1+ c2 2. Qxc2+ Kd4 3. Qd2#
Other defences
- 1. Qxb1+ Kd4 2. Qd1#
Position
- White
- king on f3, queen on a2, rook on b2, knight on b7, pawns on a3, a4, f2 and g4
- Black
- king on d3, queen on d6, bishop on a6, knights on b1 and b5, pawns on b4, c3, c4, d5, e5 and f4