[Event "?"]
[Site "?"]
[White "White Mates in Four (four solutions)"]
[Black "?"]
[Result "*"]
[Annotator "Mark Lowery's Exciting World of Chess http://chess.markalowery.net/"]
[SetUp "1"]
[FEN "2kr1b1r/2B2p1p/3p1Np1/5n1b/1P6/7K/1P3P1P/R1R2B2 w - - 0 1"]

1.Ra8+ (1.Bxd6+ Kb7 2.Rc7+ Kb8 (2...Kb6 3.Ra6#) 3.Rd7+ Kc8 4.Rc1# (4.Ra8#)) 1...Kb7 2.Rxd8 Nd4 {any Black move or pawn advance makes no difference} 3.Rb8+ Ka7 4.Ra1# *
