Welcome to Lesson 29 of Chess Summer School. This is a real "go to the head of the class" position if you get it. It's more for study of the variations that could have taken place in this game. But do give it a try. Remember, someone figured it out over the board. It does highlight a very particular type of sacrificial offer. The game was Nalbandian-Sturua,Protvino, 1993.
1.Nf5 Bxf6 ...gxf5 2.Bh6 Bg7 3.Bxg7 Qe8 4.exf5 Nb6 5.Qg5 Bxf5 6.Rxf5 Rxf5 7.Qxf5; 1...h5 2.Bh6 Qd8 3.Nxd6 Bxf6 4.Nxf7 Kxf7 5.Rxf6+ Qxf6 6.Rf1 Qxf1+ 7.Kxf1 Re8 (7...Nf6 8.Bf4) 8.Bf4 Ra8 9.Bd6 Ne6 10.e5 Kg7 11.Be4 Nb6 12.b3 Ra6 13.Bc2 Nd7 14.Qd3 Ndf8 15.Ne4 Bd7 16.Nf6 Rd8 17.Be7 Rda8 18.Nxd7 Nxd7 19.Qxg6+ Kh8 20.Qh7# 2.Nh6+ Kg7 2...Kh8 3.Rxf6 Rxg5 (3...Nxf6 4.Bxf6+) 4.Qxg5 Ne5 5.Rdxd6 Ncd7 6.Rxd7 Nxd7 7.Nxf7+ Kg7 8.Rf2 Qc5 9.e5 b5 10.Bxc6 Qxc6 11.Nd5 Rb6 12.Qh6+ Kg8 13.Ne7# 3.Rxf6 Nxf6 4.Nf5+ Bxf5 5.Bh6+ Kg8 6.Bxf8 Rxf8 7.exf5 Black Resigned.