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A42 Modern defence: Averbakh system( 1.d4 d6 2.c4 g6 3.Nb1c3 Bf8g7 4.e4) A42 Pterodactyl defence( 1.d4 d6 2.c4 g6 3.Nb1c3 Bf8g7 4.e4 c5 5.Ng1f3 Qd8a5) A42 Modern defence: Averbakh system, Randspringer variation( 1.d4 d6 2.c4 g6 3.Nb1c3 Bf8g7 4.e4 f5) A42 Modern defence: Averbakh system, Kotov variation( 1.d4 d6 2.c4 g6 3.Nb1c3 Bf8g7 4.e4 Nb8c6) Thanks to Franz Hemmer franz@hemsoft.ping.dk |