Welcome to Lesson 26 of Chess Summer School and our second middle game lesson on attacking a castled king. This pawn front has no minor pieces in front of them and thus are vulnerable themselves. The position is from Petrosian-Larsen in 1960. Larsen got even at the Piatagorsky Cup in later years with a nice queen sac. Sometimes there is no convenient mate, but you still have to win the game. Here, Petrosian sacrifices material to win material!

1.Nf6+ It's possible to play Rh3 first. 1...gxf6 1...Bxf6 2.gxf6 Ne7 3.Ne4! Ng6 4.Rh3 h6 5.fxg7 2.Rh3 Kf8 3.Qxh7 Ke8 4.g6 Bf8 5.g7 Bxg7 6.Qxg7 Qe7 7.Ne4 Rd1+ 8.Kf2 f5 9.Nf6+ and Black Resigned because of 9...Kd8 10.Rh8+ Kc7 11.Re8 winning big material.

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