To mark the start of the third month of this year, here's my all-time favourite mate-in-3 problem, composed by the famous Sam Loyd.
1st Prize, Checkmate Novelty Tourney, 1903
Solution: 1.Ke2!! f1=Q+ (1...f1=N+ 2.Rf2+; 1...Nxb4 2.Bd3+; 1...Bf4 2.Rf7/f8+; 1...Kxe4 2.Bd3+; 1...Kd4 2.Rf4+ etc.) 2.Ke3 and although Black has ten different checks available, White mates next move.