Here's another neat little problem. Black's pawn is about to promote, and all you have is a knight. Can you checkmate before the pawn promotion? White to move and mate in seven.
Don't cheat!
Solution:
1. Kc1 a3
2. Nc2+ Ka2
3. Nd4 Ka1
4. Kc2 Ka2
5. Ne2 Ka1
6. Nc1 a2
7. Nb3#
a2 is a possibility at step 4, but then it's an immediate Nb3#
The FEN for the current puzzle is:
8/8/8/8/pN6/8/2K5/k7
And, the FEN for the previous puzzle is:
1R6/2nb2kp/3p2p1/3PN2n/1P2Pp2/5N1P/1Q3PPK/r2q4
Paste them into
Chessup, and you can work out the problems there if you don't have a chessboard of your own.