[Event "Port Erin"] [Site "masterchessopen.com"] [Round "0"] [White "Gruettner, R."] [Black "Lane, G."] [Result "0-1"] [ECO "E90"] [Opening "King's Indian: 5.Nf3"] 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 Nbd7 7.O-O e5 8.d5 { This is known as the Petrosian System, named in honour of former World Champion, Tigran Petrosian, who developed it as a powerful weapon in the 1950s. In his younger years Vladimir Kramnik also employed it with success. } 8...Nc5 9.Qc2 a5 10.Ne1 h6 { The strange thing is that I played this move mainly to have a chance at the trick that occurred in the game, which is the predict-a-move method. This was because my opponent was playing at lightning speed and I thought that, as Rb1 is a standard move for White in this line, he might play it without thinking; and if not, well, 10...h6 is not so bad. } ( { The main alternative is } 10...Ne8 { . For example: } 11.-- ( 11.Be3 f5 12.exf5 gxf5 13.f4 e4 14.Qd2 Nf6 15.Nc2 Bd7 { with equal chances in J.Sherwin-R.J. Fischer, US Championship, New York 1958. } ) ( 11.f3 f5 12.Nd3 b6 { (in this line Black likes to take back on c5 with a b-pawn, partly because he can then try and prevent a safe b2-b4 by placing his rook on b8) } 13.Be3 f4 14.Bxc5 bxc5 15.a3 g5 ( { or first } 15...Rb8 ) 16.Nf2 Nf6 { , when Black has the traditional kingside attack, J.Trevelyan-T.Brown, Welsh Championship, Cardiff 2008. } ) ( 11.Rb1 f5 12.f3 f4 13.b3 ( { this is the sort of position White was expecting in the main game, where the queenside pawns are slowly pushed forward; note that the immediate } 13.a3 { is inaccurate due to } 13...a4 ) 13...g5 14.a3 Bd7 15.b4 axb4 16.axb4 Na4 17.Nd3 { with a balanced and standard position, D.Marinsek-N.Praznik, Latschach 2002. } ) ) {#R} 0-1