an endgame advantage with 5.gxf3 dxe5 6.Qxd8+ Kxd8 7.f4 Maróczy) 5...dxe5 6.Bc4 giving White the advantage of the in an open position as well as a large advantage. Black cannot block the attack on the f7-pawn with the "natural" 6...Nf6? because White wins a pawn with 7.Qb3 (played in the famous "Opera Game", where Morphy as White refrained from taking the b7-pawn and retained a strong after 7...Qe7 8.Nc3). Black does better with 6...Qf6 7.Qb3 Bc5 8.0-0 Bb6 9.a4 a5 10.Nc3 Ne7 11.Be3 Nd7 12.Rad1+/−, or 6...Qd7!? (Maróczy). Other 3rd moves for White An alternative approach for White is 3.Bc4, delaying d2–d4, or forgoing it entirely, playing d2–d3 instead. The move 3.Bc4 is also White's route to a possible Légal Trap. Some continuations: 3...Nc6 to the Semi-Italian Opening. 3...f5 is the López Countergambit: 4.d4 transposes to the Philidor Countergambit. Or unique positions can be obtained such as 4.d3 c6, possibly followed by ...f5–f4, ...b7–b5, ...a7–a5, and even ...g7–g5 and ...h7–h5, where all black pawns have moved before any piece. Or Black can try 3...Be7!? e.g. 4.0-0 (4.c3 is the Steinitz Variation) Nf6 5.Re1 0-0 6.d4 exd4 7.Nxd4 a6. Against the alternative 3.c3, Black can try 3...f5 (3...Nc6 4.d4 Nf6 transposes to the Ponziani Opening) 4.exf5 Bxf5 5.Qb3 Nf6 6.Ng5 d5 7.Qxb7 Nbd7 8.Qc6 Bd6 with and . See also List of chess openings List of chess openings named after people References Bibliography Further reading External links Opening overview Shirov's 5.g4!? gambit in the Philidor Chess openings