White to play and mate in 4 (hard)
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Show moves
1.c8=B b3 2.Bg4 b2 3.Bd1 Kxb1 4.Bb3# 1-0
Games PGN
Created about 5 years ago. 
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White ""]
[Black ""]
[Result "1-0"]
[FEN "8/1KP5/8/2p5/1pP5/p7/k7/1R3R2 w - - 0 1"]
[SetUp "1"]
[Note "The late B. H. Wood's favourite problem"]

1.c8=B b3 2.Bg4 b2 3.Bd1 Kxb1 4.Bb3# 1-0