The solution to last Monday’s problem is that White draws with 1. Kb7!
If Black replies with a5, White continues with 2. Kxc7 a4 3. Kd6 a3 4. f7! and White queens his pawn.
In this week’s problem, White has to play and win.
It is quite difficult. One difficulty is that when White promote his c-pawn, Black will be left with a pawn on the rook’s file. Generally, that is a draw as the best White can usually do is stalemate the king in the corner of the board.
But in this particular example, White can eventually deliver checkmate.
How does White win?