White to play and win (hard)
 ← 
 → 
1.Nxf7! Rxf7 2.Bxg6! hxg6 3.Re8+ Rf8 4.Rfe1 Nc6 ( 4...Nd7 5.R1e7 ; 4...Bd7 5.R1e7 ; 4...Qf6 5.Rxf8+ Qxf8 6.Qxg6+ Kh8 7.Re5 ) 5.Rxf8+ Qxf8 6.Qxg6+ Kh8 7.Re8 Qxe8 ( 7...Bf5? 8.Qh6+ Kg8 9.Qxf8+ ) 8.Qxe8+ Kg7 9.f4 Rb8 10.Qh5+− 1-0
[Event "?"]
[Site "Kuybishev"]
[Date "1970.??.??"]
[Round "?"]
[White "Krogius"]
[Black "Chernikov"]
[Result "1-0"]
[FEN "rnb2rk1/pp3p1p/3q2pQ/3pN3/2pP4/2PB4/P1P2PPP/4RRK1 w - - 0 1"]
[SetUp "1"]

1.Nxf7 $1 Rxf7 2.Bxg6 $1 hxg6 3.Re8+ Rf8 4.Rfe1 Nc6 ( 4...Nd7 5.R1e7 ) ( 
4...Bd7 5.R1e7 ) ( 4...Qf6 5.Rxf8+ Qxf8 6.Qxg6+ Kh8 7.Re5 ) 5.Rxf8+ Qxf8
6.Qxg6+ Kh8 7.Re8 Qxe8 ( 7...Bf5 $2 8.Qh6+ Kg8 9.Qxf8+ ) 8.Qxe8+ Kg7 9.f4 Rb8
10.Qh5 $18 1-0