Bishop and knight checkmate
White to move and win.
The hardest basic mate, and you have only fifty moves. It can be forced only in a corner of the bishop's colour.
The idea
- Drive the king to the edge first, using your king and both pieces together.
- Mate works only in a corner your bishop can reach.
- If the king runs to the wrong corner, drive it along the edge with the W manoeuvre of the knight.