rnb1k1nr/pp1pppbp/1q4p1/2p5/2PPP3/5N2/PP3PPP/RNBQKB1R w KQkq - 1 5 ; A04 Modern Defense: Semi-Averbakh Variation, Polish Variation
rnb1k1nr/pp1pppbp/6p1/q1p5/2PPP3/5N2/PP3PPP/RNBQKB1R w KQkq - 1 5 ; A04 Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation
rnb1k1nr/pp2ppbp/3p2p1/q1P5/2P1P3/5N2/PP3PPP/RNBQKB1R w KQkq - 1 6 ; A04 Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted
rnbqk1nr/pp1pp2p/6p1/2pP1p2/2P5/2P5/P3PPPP/R1BQKBNR w KQkq - 0 6 ; A40 Modern Defense: Beefeater Variation
rnbqkb1r/pppppp1p/5np1/7P/3P4/8/PPP1PPP1/RNBQKBNR b KQkq - 0 3 ; A40 Modern Defense: Lizard Defense, Pirc-Diemer Gambit
rnbqk1nr/ppp1ppbp/3p2p1/8/2PP4/2N5/PP2PPPP/R1BQKBNR w KQkq - 0 4 ; A41 Modern Defense
rnbqk1nr/pppp1pbp/6p1/4p3/2PPP3/8/PP3PPP/RNBQKBNR w KQkq - 0 4 ; A41 Modern Defense: Neo-Modern Defense
rnbqk1nr/ppp1ppbp/3p2p1/8/2PPP3/2N5/PP3PPP/R1BQKBNR b KQkq - 0 4 ; A42 Modern Defense: Averbakh System
rnbqk2r/ppp1ppbp/3p1np1/8/2PPP3/4BP2/PP4PP/RN1QKBNR b KQkq - 0 5 ; A42 Modern Defense: Averbakh Variation, Pseudo-Sämisch
r1bqk1nr/ppp1ppbp/2np2p1/8/2PPP3/2N5/PP3PPP/R1BQKBNR w KQkq - 1 5 ; A42 Modern Defense: Kotov Variation
rnbqk1nr/ppp1p1bp/3p2p1/5p2/2PPP3/2N5/PP3PPP/R1BQKBNR w KQkq - 0 5 ; A42 Modern Defense: Randspringer Variation
rnbqkbnr/pppppp1p/6p1/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2 ; B06 Modern Defense
rnbqk1nr/ppppppbp/6p1/8/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - 1 3 ; B06 Modern Defense
rnbqk1nr/pp2ppbp/2pp2p1/8/2BPP3/2N5/PPP1QPPP/R1B1K1NR b KQkq - 1 5 ; B06 Modern Defense: Anti-Modern
rnbqk1nr/ppppppbp/6p1/8/2BPP3/8/PPP2PPP/RNBQK1NR b KQkq - 2 3 ; B06 Modern Defense: Bishop Attack
rnbqk1nr/p1ppppbp/6p1/1p6/2BPP3/8/PPP2PPP/RNBQK1NR w KQkq - 0 4 ; B06 Modern Defense: Bishop Attack, Bücker Gambit
rnbqk1nr/pppp1p1p/4p1p1/8/2BbP3/5Q2/PPP2PPP/RNB1K1NR w KQkq - 0 5 ; B06 Modern Defense: Bishop Attack, Monkey's Bum
rnbqk1nr/pp2pp1p/2P3p1/8/2Pb4/8/PP3PPP/RNBQKBNR w KQkq - 0 6 ; B06 Modern Defense: Dunworthy Variation
rnbqkbnr/ppppp2p/6p1/5p2/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - 0 3 ; B06 Modern Defense: Fianchetto Gambit
rnbqk1nr/pp2ppb1/2p3p1/3pP2p/3P1P2/2N5/PPP3PP/R1BQKBNR w KQkq - 0 6 ; B06 Modern Defense: Gurgenidze Defense
rnbqk1nr/ppp1ppbp/6p1/3p4/3PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 0 4 ; B06 Modern Defense: Lizard Defense, Mittenberger Gambit
rnbq1rk1/ppppp2p/6pb/5P2/3P4/2N5/PPP2PPP/R2QKBNR w KQ - 1 6 ; B06 Modern Defense: Masur Gambit
rnbqk1nr/pp1pppbp/6p1/2p5/3PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 0 4 ; B06 Modern Defense: Modern Pterodactyl
rnbqk1nr/p1ppppbp/1p4p1/8/3PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 0 4 ; B06 Modern Defense: Mongredien Defense, with Nc3
rnbqk1nr/p1ppppbp/1p4p1/8/3PP3/5N2/PPP2PPP/RNBQKB1R w KQkq - 0 4 ; B06 Modern Defense: Mongredien Defense, with Nf3
rnbqkb1r/pppppp1p/5np1/8/3PP3/8/PPP2PPP/RNBQKBNR w KQkq - 1 3 ; B06 Modern Defense: Norwegian Defense
rnbqkb1r/ppp1pp1p/3p2p1/4P2n/3P4/8/PPP1BPPP/RNBQK1NR w KQkq - 0 5 ; B06 Modern Defense: Norwegian Defense, Norwegian Gambit
rnbqk1nr/ppp1ppbp/3p2p1/8/3PPP2/2N5/PPP3PP/R1BQKBNR b KQkq - 0 4 ; B06 Modern Defense: Pseudo-Austrian Attack
rnb1k1nr/pp2ppbp/3p2p1/q1p5/2PPP3/5N2/PP2BPPP/RNBQK2R w KQkq - 2 6 ; B06 Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Declined
rnbqk1nr/ppp1ppbp/3p2p1/8/3PP3/2N5/PPP2PPP/R1BQKBNR w KQkq - 0 4 ; B06 Modern Defense: Standard Defense
rnbqk1nr/ppppppbp/6p1/8/3PP3/2N5/PPP2PPP/R1BQKBNR b KQkq - 2 3 ; B06 Modern Defense: Standard Line
rnbqk1nr/ppppppbp/6p1/8/3PPP2/8/PPP3PP/RNBQKBNR b KQkq - 0 3 ; B06 Modern Defense: Three Pawns Attack
rnbqk1nr/ppp1ppbp/3p2p1/8/3PP3/2N2N2/PPP2PPP/R1BQKB1R b KQkq - 1 4 ; B06 Modern Defense: Two Knights Variation
rnbqk1nr/pp2ppbp/2pp2p1/8/3PP3/2N2N2/PPP2PPP/R1BQKB1R w KQkq - 0 5 ; B06 Modern Defense: Two Knights Variation, Suttles Variation
rnb1k1nr/pp2ppbp/2pp2p1/6B1/3PP3/2N2N2/PqPQ1PPP/R3KB1R w KQkq - 0 7 ; B06 Modern Defense: Two Knights Variation, Suttles Variation, Tal Gambit
rnbqk1nr/ppppppbp/6p1/8/3PP3/8/PPPB1PPP/RN1QKBNR b KQkq - 2 3 ; B06 Modern Defense: Westermann Gambit
rnbqk1nr/ppppppbp/6p1/8/3PP3/3B4/PPP2PPP/RNBQK1NR b KQkq - 2 3 ; B06 Modern Defense: Wind Gambit
rnbqk1nr/ppp1ppbp/3p2p1/8/3PP3/2P2N2/PP3PPP/RNBQKB1R b KQkq - 0 4 ; B07 Modern Defense: Geller's System
rnb1k1nr/pp1pppbp/6p1/q1p5/3PP3/2N2N2/PPP2PPP/R1BQKB1R w KQkq - 3 5 ; B27 Modern Defense: Pterodactyl Variation