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A21 English opening( 1.c4 e5 2.Nb1c3) A21 English, Troeger defence( 1.c4 e5 2.Nb1c3 d6 3.g3 Bc8e6 4.Bf1g2 Nb8c6) A21 English, Keres variation( 1.c4 e5 2.Nb1c3 d6 3.g3 c6) A21 English opening( 1.c4 e5 2.Nb1c3 d6 3.Ng1f3) A21 English, Smyslov defence( 1.c4 e5 2.Nb1c3 d6 3.Ng1f3 Bc8g4) A21 English, Kramnik-Shirov counterattack( 1.c4 e5 2.Nb1c3 Bf8b4) Thanks to Franz Hemmer franz@hemsoft.ping.dk |