I play the ooo in the Exchange. The a4-b4 pawn roller gains in force against this line when light square bishops are not exchanged. That's why the best strategy is to use the "delay castling" trick..to let not White use this attack. Useful to remember too are the basic ideas of the good (for Black) exchange of light square bishops and the defence over the greek sacrifice Bxh7. 1.e4 e6 2.d4 d5 3.exd5 exd5 4.Bd3 Nc6!? 5.Nf3 Bg4 6.c3 Bd6 7.oo Nge7 (a little better than the obvious Qd7 Burn-Spielmann,1912) and now here are some lines vs pawn roller A) 8.Re1 Qd7 A1) 9.Nbd2 ooo 10.b4 (10.a4 g5Gunnarsson, R.-Ingolfsdottir, Harpa Reykjavik ISL, Open 2004 1/2-1/2 Reykjavik ISL Round 6 2004 and Barrero Garcia, Carlos-Matamoros Franco, Carlos Espartinas ESP, Closed IM 07 1/2-1/2 Espartinas ESP Round 4 2007 ) Rde8 (the idea to play Nd8 vs a later b5) 11.a4 (11.b5 Na5! Novikova, M.-Zhesterev, Anatol Kiev UKR, 6th Kurass Memorial 0-1 Kiev UKR Round 6 2005 ) Ng6 (with Nbd2, f4 and h4 are weak squares) Hentzschel, E.-Monte, P. 10th European Senior Team Ch 0-1 Dresden GER Round 6 2008 A2) 9.Bg5?! (seen as dubious because improving Black pawn roller on kingside) f6 10.Bh4 h5! Miroiu, George Catalin-Szabo, Gergely-Andras-Gyul Napoca ROM, Men Ch 2008 0-1 Napoca ROM Round 5 2008 A3) 9.Be3 f5 Dayan, Cansu-Vahtra, Tuuli Antalya TUR, World Youth Ch 2007 0-1 Antalya TUR Round 6.25 2007 A3) 9.h3 Bf5 (9...Bh5 insists on castling queenside 10.a4 (10.b4 Nd8!?) ooo 11.a5 (11.Nbd2 g5!) f6 12.a6 (12.b4 Rde8! (Psakhis) Kochiev-Psakhis,Tallinn 1987 (MCO) ) b6 13.Bb5 Rde8 14.Nbd2 Ng6! 15.Rxe8+ Rxe8 16.g4 Nf4 17.Bxc6 Qxc6 18.gxh5 Nxh3+ 19.Kf1 Qb5+ 20.c4 dxc4 21.Qa4 Qxa4 22.Rxa4 b5 23.Rxa5 c6 (old database about Exchange)) 10 Bg5 oo= A4) 9.b3 ooo or 9..oo Kivisto, Mikko-Kekki, Petri FIN-ch 1/2-1/2 Helsinki 1987 A5) 9.Na3 Bxa3 and a kingside castling Sion Castro, Marcelino-De la Villa Garcia, Jesus Maria Leon 0-1 Leon 1989 (Ech) A6) 9.b4 f6!? 10.a4 oo! 11.Nbd2 Ng6 A7) 9.a4 f6 (9..ooo 10.a5 Ng6 11.b4 Nde8 12.Rxe8+ (12.Re1 Nh4 ; 12.b5?? Nxd4! worth to remelber it) Rxe8 13.Be3 Nf4 14.Bf1 Qf5 15.Nbd2 Qg6 16.Bxf4 Bxf4 17.Qb1 Qh6 18.Qb2 g5 19.b5 Nd8 20.g3 Petlak, Josef-Merenkov, Mikhail Moravia-ch op 1/2-1/2 Moravia 1996 (Ech) A8) 9.Be2 oo Zulic, J.-Hanson, D. Iowa op 0-1 1994 (Ech) B) 8.Nbd2 Qd7 9.b4 oo (safe...Banchev-Lupu,Orange 1990) but 9.Te1 ooo!? (because pawn roller is one tempo less) C) 8.h3?! Bh5 9.b4 Bg6 or 9.Re1 Qd7 10.b4 Nd8!? or 10..ooo 11.a4 (11.b5 Na5) Rde8 12.a5 Ng6 13.Be3 Nh4 14.Be2 Nf5= D) 8.Bg5?! f6 9.Bh4 h5 Opocensky-Alekhine,Paris 1925 (Susan Polgar) E) 8.Be3 Qd7 9.Nbd2 ooo 10.b4 Ng6 Nyland, T.-Roos, J. First Saturday IM-B August 09 0-1 Budapest HUN Round 6 2009 F) 8.a4 Postny-Khenkin,Moscou 2004 Qd7 9.a5/b4 oo G) 8.b4 Qd7 9.Re1 f6 10.a4 oo or 10.b5 Na5 or 10.Nbd2 Nd8 (with the curious idea of using f7 square for the d8 knight) Haapasalo, Jukka Pekka-Manninen, Marko Vantaa op2 0-1 Vantaa Round 7 1994 (Ech)
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