A03 Bird's Opening with 1...d5 (1.f4 d5 2.c4)

Depending on the source, the name of the opening changes a bit and the ECO code can also change. According to both Fritz 16 and 365chess, the ECO code is A03, but according to lichess, the ECO code is A02. The name given for this variation also differs from those sources. Fritz 16 classifies the opening as A03 Bird's Opening with 1...d5, lichess gives the name A02 Bird Opening: Sturm Gambit and 365chess gives the name A03 Mujannah opening.

[Event "Yahoo"] [Site "?"] [Date "2006.11.10"] [Round "?"] [White "idoubleu"] [Black "Vierjoki, Timo"] [Result "1-0"] [ECO "A03"] [Annotator "Tactical Analysis 2.10 (30s), TV"] [PlyCount "54"] 1. f4 d5 2. c4 {A03 Bird's Opening with 1...d5 A02 Bird Opening: Sturm Gambit} dxc4 3. e4 (3. Nc3 Nf6 4. e4 c6 5. e5 Nd5 6. Bxc4 Nb6 7. Bb3 Bf5 8. e6 fxe6 9. Qh5+ g6 {1/2-1/2 (9) Ynojosa Aponte,F (2448)-Estrada Nieto,J (2278) Panama City 2013}) 3... e6 (3... Nc6 4. Bxc4 e6 5. Nf3 Bc5 6. Nc3 a6 7. a3 b5 8. Ba2 Bb7 9. b4 Bb6 10. Ne2 Nd4 11. Nc3 Nf6 12. d3 Ng4 13. h3 Nxf3+ 14. Qxf3 Nf2 15. Rf1 Nxd3+ 16. Ke2 Nxc1+ 17. Raxc1 Qe7 18. Rfd1 {Osorio,C (2192)-Posada Zuluaga, J (2057) Medellin 2013 0-1}) 4. Bxc4 $146 (4. Nf3 Nf6 5. Qa4+ Bd7 6. Qxc4 Nc6 7. Bd3 Nb4 8. Ne5 Nxd3+ 9. Qxd3 Bc5 10. Nxd7 Nxd7 11. Qc3 e5 12. d3 Bd4 13. Qc4 O-O 14. Nc3 Nb6 15. Qb3 a5 16. Ne2 a4 17. Qc2 a3 18. Nxd4 Qxd4 {Kuehn, T-Pueschel,W Giessen 1996 0-1}) 4... Qh4+ 5. g3 Qd8 $1 6. Nf3 {0.30/25} (6. d4 $1 $16 {0.95/22}) 6... Nc6 {1.47/21} (6... c5 $11 {0.30/25 keeps the balance.}) 7. a3 {0.06/27} (7. d4 $16 {1.47/21}) 7... Bc5 $11 8. b4 {White is slightly better.} Bb6 {0.44/22} (8... Bd4 $11 {-0.02/25 should be considered.} 9. Nc3 Nf6) 9. Bb2 $14 Nf6 10. e5 {-0.29/28} (10. Nc3 $14 {0.59/25}) 10... Nd5 $11 11. Nc3 {-0.34/25} (11. Qe2 $14 {0.44/26}) 11... Nxc3 {0.75/26} (11... Nce7 $15 { -0.34/25 keeps the upper hand.}) 12. Bxc3 {-0.68/24} (12. dxc3 $16 {0.75/26} Qxd1+ 13. Rxd1) 12... O-O {0.39/23} (12... a6 $15 {-0.68/24}) 13. d4 {-0.19/28} ({Better is} 13. a4 $14 {0.39/23}) 13... Ne7 {0.64/24} (13... Bd7 $11 {-0.19/28 }) 14. O-O {-0.15/29} ({White should try} 14. a4 $14 {0.64/24} a5 15. b5) 14... Nf5 {0.94/22} (14... a6 $11 {-0.15/29}) 15. Qd2 {-0.28/26} (15. Qd3 $16 { 0.94/22}) 15... Bd7 {0.17/29} (15... h5 $142 {-0.28/26}) 16. Bd3 {-0.91/26} ( 16. a4 $11 {0.17/29} a6 17. g4) 16... Ne7 {0.25/28} (16... Bc6 $17 {-0.91/26} 17. Bxf5 exf5) 17. Ng5 {-0.79/22} (17. a4 $11 {0.25/28 remains equal.} a6 18. Be4) 17... h6 $1 $17 18. Ne4 {-1.04/28 [#]} ({White should play} 18. Nf3 $1 $15 {-0.38/24}) 18... Bc6 $1 19. Nf2 {-1.58/26} (19. Bc2 $1 $15 {-0.51/29}) 19... Bxd4 $2 {3.88/24} (19... Qd5 $17 {-1.58/26 keeps the pressure on.} 20. Be4 Qd7) 20. Bxd4 $18 Kh8 ({Don't blunder} 20... Qxd4 $2 {[#]} 21. Bh7+ $1 Kxh7 22. Qxd4 $18) 21. Bc5 Re8 22. Qe2 b6 23. Bxe7 Rxe7 24. Ne4 Qd5 25. Rfe1 {White is clearly winning.} f5 {7.12/25} (25... Qd8 $142 {4.75/29} 26. Red1 Rd7) 26. exf6 gxf6 27. Rad1 f5 {Accuracy: White = 16%, Black = 20%.} 1-0 [Event "Yahoo"] [Site "?"] [Date "2006.11.10"] [Round "?"] [White "idoubleu"] [Black "Vierjoki, Timo"] [Result "1-0"] [ECO "A03"] [Annotator "Tactical Analysis 2.10 (30s), TV"] [PlyCount "68"] 1. f4 d5 2. c4 {A03 Bird's Opening with 1...d5 A02 Bird Opening: Sturm Gambit} dxc4 3. e4 (3. Nc3 Nf6 4. e4 c6 5. e5 Nd5 6. Bxc4 Nb6 7. Bb3 Bf5 8. e6 fxe6 9. Qh5+ g6 {1/2-1/2 (9) Ynojosa Aponte,F (2448)-Estrada Nieto,J (2278) Panama City 2013}) 3... e6 4. Bxc4 Nc6 5. a3 $146 (5. Nf3 Bc5 6. Nc3 a6 7. a3 b5 8. Ba2 Bb7 9. b4 Bb6 10. Ne2 Nd4 11. Nc3 Nf6 12. d3 Ng4 13. h3 Nxf3+ 14. Qxf3 Nf2 15. Rf1 Nxd3+ 16. Ke2 Nxc1+ 17. Raxc1 Qe7 18. Rfd1 O-O 19. g3 Kh8 {Osorio,C (2192)-Posada Zuluaga,J (2057) Medellin 2013 0-1}) 5... Bc5 {aiming for ... Bxg1.} 6. Nf3 {-0.88/21} (6. d3 $11 {-0.28/26}) 6... Nd4 {-0.08/28} (6... Nf6 $17 {-0.88/21} 7. Nc3 Bb6) 7. Nxd4 $11 Qxd4 8. Qe2 {The position is equal.} Ne7 9. Nc3 {-0.99/22} (9. d3 $11 {-0.19/27}) 9... c6 {0.35/25} ({Better is} 9... a6 $1 $17 {-0.99/22}) 10. Na4 {-0.73/28} (10. b4 $14 {0.35/25} b5 11. Bxb5 (11. bxc5 bxc4 12. Rb1 Ba6 $11)) 10... b5 $2 {0.98/29} (10... Bd6 $17 {-0.73/28 and life is bright. Threatens to win with ...b5.} 11. d3 b5) 11. Nxc5 $16 Qxc5 { 1.75/25} ({Black should play} 11... bxc4 $14 {0.47/26} 12. Qf2 Qxf2+ 13. Kxf2 Rb8) 12. Bb3 {1.28/30} (12. Ba2 $18 {1.75/25}) 12... O-O 13. d3 $1 Ba6 {2.28/23 } (13... Qd6 $16 {1.14/29 is a better defense.}) 14. Be3 $18 Qd6 15. O-O { 1.14/26} ({White should try} 15. Qc2 $18 {2.28/23}) 15... b4 {2.00/26} (15... c5 $16 {1.14/26 was called for.}) 16. Rfd1 bxa3 {2.35/23} (16... Rfd8 $142 { 1.71/28} 17. axb4 Bxd3) 17. Rxa3 Bb5 {2.43/23} (17... c5 $142 {1.65/26} 18. Qh5 Rac8) 18. Raa1 Rfd8 {2.00/23} (18... a5 $16 {1.49/28} 19. Qf2 Rfe8) 19. Bc2 Ng6 20. Ra3 $2 {-0.20/25} (20. Qf2 $18 {1.92/23}) 20... Nxf4 $11 21. Qg4 {-0.86/23} (21. Qe1 $11 {0.00/29 remains equal.}) 21... Ng6 {0.21/27} (21... e5 $17 { -0.86/23}) 22. d4 {-0.94/23 [#]} (22. h4 $11 {0.21/27}) 22... a6 {0.02/28} ( 22... e5 $1 $17 {-0.94/23}) 23. e5 Qc7 $2 {2.19/24} (23... Qb4 $11 {0.00/27 and Black is okay.} 24. Rb3 Qc4) 24. Bxg6 $2 {0.00/29} (24. Bg5 $18 {2.19/24}) 24... hxg6 $4 {3.43/23} (24... fxg6 $11 {0.00/29} 25. Qxe6+ Qf7 26. Qxf7+ Kxf7) 25. h4 $2 {-0.48/25 [#]} (25. Bg5 $18 {3.43/23} Qb6 26. Rh3 (26. Bxd8 Qxd8 27. h4 Qe7 $16)) 25... c5 $1 $15 26. Rc3 {-0.88/29 [#]} (26. Rc1 $11 {-0.25/29 keeps the balance.}) (26. dxc5 Rxd1+) 26... c4 $2 {2.40/25} (26... Qb7 $1 $17 { -0.88/29} 27. Rxc5 Bc6) 27. h5 $18 gxh5 28. Qxh5 Qb7 $2 {10.82/24} (28... f5 { 2.36/28} 29. exf6 Qf7) 29. Rf1 $2 {3.70/26} (29. Bg5 {10.82/24 White threatens Bf6! and mate.} f5 30. Rh3) 29... a5 $2 {17.02/27} (29... Be8 {3.70/26} 30. Qg4 Qd5) 30. Rf4 {7.68/29} (30. Bg5 $142 {17.02/27} f5 31. exf6) 30... g6 31. Qh3 { 11.48/27} (31. Qh6 $142 {61.76/24} Qe7 32. Rh4 Qxh4 33. Qxh4 Kf8 34. Qf6 Ke8 35. Bg5 Kd7 36. Qe7+ Kc8 37. Qc5+ Bc6 38. Qxc6+ Kb8 39. Qb6+ Kc8 40. Rxc4+ Kd7 41. Qc6#) 31... Kg7 32. Rh4 {Bg5 would kill now.} Rh8 33. Bh6+ {12.80/29} (33. Bg5 $142 {#10/30} Rxh4 34. Qxh4 f6 35. Bxf6+ Kg8 36. Qh8+ Kf7 37. Qh7+ Kf8 38. Qxb7) 33... Kg8 34. Qg4 {Strongly threatening Rch3.} Qe7 {Accuracy: White = 25%, Black = 11%.} 1-0