White to play and win (hard)
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1.Rd4+! Kxd4 2.Nd6 b1=Q ( 2...b1=N 3.Nb5+ Kc4 ( 3...Ke4 4.Kd1 Kxf4 5.Kc2 Ke3 6.Kxb1 Kd3 7.Na7 ) 4.f5 Kxb5 5.f6 ) 3.Nb5+ Kc4 4.Na3+ Kxb4 5.Nxb1 1-0
[Event "?"]
[Site "?"]
[Date "????.??.??"]
[Round "?"]
[White "?"]
[Black "?"]
[Result "1-0"]
[FEN "8/5N2/1p6/3k4/1PR2P2/8/1p2K3/8 w - - 0 1"]
[SetUp "1"]

1.Rd4+ $1 Kxd4 2.Nd6 b1=Q ( 2...b1=N 3.Nb5+ Kc4 ( 3...Ke4 4.Kd1 Kxf4 5.Kc2
Ke3 6.Kxb1 Kd3 7.Na7 ) 4.f5 Kxb5 5.f6 ) 3.Nb5+ Kc4 4.Na3+ Kxb4 5.Nxb1 1-0