White to play and win (hard)
 ← 
 → 
1.Rxe7+! Kxe7 2.Rc7+ Ke8 ( 2...Kf8 3.Qf5 ; 2...Kf6 3.Qf3+ ) 3.Qf5 Rf8 4.Ng3‼ ( 4.Nd4? Qb6 5.Ne6 Qg1+ 6.Rc1 Qxc1+ 7.Kxc1 Rc8+ 8.Kd2 fxe6⩲ ) 4...Qb6 5.Nh5 Qg1+ 6.Rc1 Qa7 7.Nf6+ Ke7 8.Rc7+! 1-0
[Event "?"]
[Site "Cuba"]
[Date "1994.??.??"]
[Round "?"]
[White "Medina"]
[Black "Gonzalez"]
[Result "1-0"]
[FEN "3rk2r/2R1bp2/q2p3p/4p1p1/pp6/3P3Q/PP2N2P/1KR5 w k - 0 1"]
[SetUp "1"]

1.Rxe7+ $1 Kxe7 2.Rc7+ Ke8 ( 2...Kf8 3.Qf5 ) ( 2...Kf6 3.Qf3+ ) 3.Qf5 Rf8
4.Ng3 $3 ( 4.Nd4 $2 Qb6 5.Ne6 Qg1+ 6.Rc1 Qxc1+ 7.Kxc1 Rc8+ 8.Kd2 fxe6 $14 )
4...Qb6 5.Nh5 Qg1+ 6.Rc1 Qa7 7.Nf6+ Ke7 8.Rc7+ $1 1-0