The BENKO GAMBIT
[Event "The Benko Gambit"] [Site "TEST"] [Date "2012.05.2"] [Round "1"] [White "Kasparov President"] [Black "Kasparov President"] [Result ""] [ECO ""] [WhiteElo "2800"] [BlackElo "2800"] [Annotator "Mraovich,Robert"] [PlyCount "80"] [EventDate "2012.??.??"] [EventType "tourn"] [EventRounds "1"] [EventCountry "RUS"] [EventCategory "17"] [SourceDate "2012.05.2"] {Kasparov President} 1. d4 ({The walk and castle by hand variation goes: } 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 g6 7. e4 Bxf1 8. Kxf1 d6 9. Nf3 Bg7 10. g3 O-O 11. Kg2 Nbd7 12. Re1 Qa5 13. h3 Rfb8 14. e5 dxe5 15. Nxe5 Nxe5 16. Rxe5 Rb7 17. Qf3 Ne8 18. Re2 Nd6 19. Ne4 Nxe4 20. Rxe4 Qd8 21. Rf4 Rd7 22. Be3 Rxd5 23. Rc1 Bxb2 24. Rxc5 {equal}) 1...Nf6 2. c4 c5 3. d5 b5 4. cxb5 (4. cxb5 a6 5. bxa6 g6 6. Nc3 Bxa6 7. g3 d6 8. Bg2 Bg7 9. Nf3 Nbd7 10. Rb1 O-O 11. O-O Qa5 12. Bd2 Rfb8) 4...a6 5. bxa6 (5. b6 d6 6. Nc3 Qxb6 7. e4 g6 8. Nf3 Bg7 9. Nd2 O-O 10. Be2 Nbd7 11. O-O Qc7 12. a4 Rb8 13. a5 Ne8 14. Nc4 Ne5 15. Nb6 Nd7 16. Nc4 Ne5 {Draw???}) 5...Bxa6 6. g3 (6. Nc3 g6 7. g3 d6 8. Bg2 Bg7 9. Nf3 Nbd7 10. Rb1 O-O 11. O-O Qa5 12. Bd2 Rfb8) 6...d6 7. Bg2 g6 8. Nf3 Bg7 9. O-O O-O 10. Nc3 Nbd7 11. Rb1 Qa5 12. Bd2 Rfb8 13. Qc2 Qc7 14. b3 Nb6 15. Nh4 Qb7 16. Rfd1 Nfxd5 17. Nxd5 Nxd5 18. Bh6 (18. Bh6 Nb4 19. Qd2 Nc6 20. Bxc6 Qxc6 21. Nf5 Bf6) 18...Bxh6 19. Bxd5 Qc8 20. Nxg6 Ra7 21. Nh4 e6 {more lines are added in the 2nd game viewer below...}
BENKO GAMBIT more lines...
[Event "The Benko Gambit, more lines..."] [Site "TEST"] [Date "2012.05.2"] [Round "1"] [White "Kasparov President"] [Black "Kasparov President"] [Result ""] [ECO ""] [WhiteElo "2800"] [BlackElo "2800"] [Annotator "Mraovich,Robert"] [PlyCount "80"] [EventDate "2012.??.??"] [EventType "tourn"] [EventRounds "1"] [EventCountry "RUS"] [EventCategory "17"] [SourceDate "2012.05.2"] {Kasparov President} 1. d4 (1.d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. g3 d6 7. Bg2 g6 8. b3 Bg7 9. Bb2 O-O) 1...Nf6 2. c4 (2. c4 c5 3. d5 b5 4. cxb5 a6 5. b6 Qxb6 6. Nc3 e6 7. e4 Bb7 8. Nf3 Be7 9. Bc4 exd5 10. exd5) 2...c5 3. d5 (3. d5 b5 4. cxb5 a6 5. b6 Qxb6 6. Nc3 g6 7. Nf3 d6 8. Nd2 Bg7 9. e4 O-O) 3...b5 4. cxb5 (4. cxb5 a6 5. b6 Qxb6 6. Nc3 e6 7. e4 exd5 8. exd5 d6 9. Nf3 Be7 10. Be2) 4...a6 5. bxa6 (5. b6 d6 {5. Nc3 is playable...} 6. Nc3 g6 {6. Nc3 Nbd7 is playable...} 7. e4 Bg7 8. a4 a5 9. Bb5 Nbd7 ) 5...Bxa6 6. g3 (6. Nc3 g6 7. e4 Bxf1 8. Kxf1 d6 9. g3 Bg7 10. Kg2 O-O 11. Nf3 Nbd7 12. h3 Ra7 13. Re1 Qa8) 6...g6 7. b3 Bg7 8. Bb2 O-O 9. Bg2 d6 10. Nh3 Nbd7 11. O-O (11. O-O Ra7 12. Nf4) 11...Qb6 12. Bc3 Ra7 13. Re1 Rb8 14. Nd2 {even more lines in the 3rd game viewer below, I guess there is a lot to the Benko Gambit!...}
BENKO GAMBIT even more lines...
[Event "The Benko Gambit, even more lines..."] [Site "TEST"] [Date "2012.05.2"] [Round "1"] [White "Kasparov President"] [Black "Kasparov President"] [Result ""] [ECO ""] [WhiteElo "2800"] [BlackElo "2800"] [Annotator "Mraovich,Robert"] [PlyCount "80"] [EventDate "2012.??.??"] [EventType "tourn"] [EventRounds "1"] [EventCountry "RUS"] [EventCategory "17"] [SourceDate "2012.05.2"] {Kasparov President} 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. b6 (5. bxa6 g6 6. Nc3 Bxa6 7. g3 d6 8. Bg2 Bg7 9. Nf3 Nbd7 10. Rb1 O-Ob 11. O-O Qa5 12. Bd2 Rfb8) 5...d6 6. Nc3 Qxb6 7. e4 g6 8. Nf3 Bg7 9. Nd2 O-O 10. Be2 Nbd7 11. O-O Rb8 12. Nc4 Qc7 13. Bf4 Nb6 14. Ne3 Nfd7 15. Rc1 Ne5 16. Bg3 f5 17. f4 Nf7 18. exf5 gxf5 19. Bd3 Nh6 20. Qe2 Nd7 21. Bh4 Nf6 22. Bg5
BENKO GAMBIT even more lines...
[Event "The Benko Gambit, even more lines..."] [Site "TEST"] [Date "2012.05.2"] [Round "1"] [White "Kasparov President"] [Black "Kasparov President"] [Result ""] [ECO ""] [WhiteElo "2800"] [BlackElo "2800"] [Annotator "Mraovich,Robert"] [PlyCount "80"] [EventDate "2012.??.??"] [EventType "tourn"] [EventRounds "1"] [EventCountry "RUS"] [EventCategory "17"] [SourceDate "2012.05.2"] {Kasparov President} 1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 (5. Nc3 axb5 6. e4 Qa5 7. Bd2 b4 8. e5 bxc3 9. Bxc3 Qa4 10. Qxa4 Rxa4 11. exf6 gxf6 12. Bb5) 5...Bxa6 6. Nc3 (6. Nc3 g6 7. e4 Bxf1 8. Kxf1 d6 9. Nf3 Bg7 10. g3 O-O 11. Kg2 Nbd7 12. Re1 Ng4 13. Nd2 Nge5 14. Qe2 Nb6 15. f4 Ned7 16. a4 Bxc3 17. bxc3 Nxa4 18. c4 Nab6 19. Bb2 Na4 20. Bc1 Nab6 21. Bb2 {equal} ) 6...d6 7. Nf3 g6 8. e4 Bxf1 9. Kxf1 Bg7 10. g3 O-O 11. Kg2 Nbd7 12. Re1 (12. Re1 Ng4 13. Re2 Qa5 14. Bg5 Rfb8 15. Rc1 h6 16. Bd2 Qa6) 12...Qa5 13. Rb1 Rfb8 14. Re2 Rb7

The Benko Gambit. In Russia, its called the Volga Gambit. If white accepts the pawn sac, Black obtains a development advantage and enduring pressure on the white queenside along the A and B files. The Bishop on G7 also gives strong support as well! There are many different variations to this line, however I think Black has full compensation for the pawn sac hence it playability...