Alternatively, after 6.h3, Black can retreat the bishop with 6...Bh5 7.g4 Bg6 8.Ne5, a line which often transposes to the Gunderam Defence line 5...Bf5 6.Ne5 e6 7.g4 Bg6 after a subsequent h3–h4, as White's extra tempo with h3 is not particularly useful. Euwe Defence: 5...e6 The 5...e6 line, analysed by Max Euwe, aims to reach a French Defence type position, but with Black having an extra pawn. Play usually continues 6.Bg5 Be7, when White's most popular option is 7.Bd3. Black can attack the centre immediately with 7...c5!? here, as recommended by Joe Gallagher and James Rizzitano. Play can continue 8.dxc5 Qa5 9.0-0 Qxc5+ 10.Kh1, when White has to play accurately to prove compensation for the pawn. Alternatively 7...Nc6 can be considered the main line of this variation, when 8.0-0 Nxd4 9.Kh1 is the notorious Zilbermints Gambit, sacrificing a second pawn in order to increase White's initiative. The Zilbermints Gambit has scored well in practice, but objectively it probably does not give White enough compensation for two pawns. However, the alternative 8.a3, despite the loss of time, offers White good compensation for the pawn, and White can also consider 8.Qd2, allowing the trade of the bishop on d3 but avoiding any loss of time. White's main alternative to 7.Bd3 is 7.Qd2, aiming to castle queenside and giving additional support to the d4-pawn, while aiming to launch a kingside offensive with Qd2–f4 and meeting ...h6 with a dangerous Bxh6 sacrifice. Play can continue 7...0-0 8.0-0-0 (8.Bd3 c5! is better for Black) 8...c5 9.Qf4!? cxd4 10.Rxd4 or 7...h6 8.Bh4 (8.Bf4 is also possible, aiming to keep the Bxh6 sacrifice possibility open, but allowing 8...Bb4 9.Bc4 Ne4) 8...Ne4 9.Nxe4 Bxh4+ 10.g3 Be7 11.Bg2, when White has some compensation for the pawn but the final verdict on the resulting positions is still yet to be reached. Bogoljubov Defence: 5...g6 The Bogoljubov Defence was played by Diemer himself in a game against Bogoljubov. By fianchettoing the king's bishop Black aims to gain increased pressure against the d4-pawn following a subsequent ...c5. White's most common response is the Studier Attack, 6.Bc4 Bg7 7.0-0 0-0 8.Qe1, intending Qh4, Bh6 and piling pressure on the kingside, sacrificing pawns at d4 and c2 if appropriate. However, after Peter Leisebein's 8...Nc6 9.Qh4 Bg4!, it is doubtful if White obtains enough compensation for the pawn against accurate play. An alternative approach is to castle queenside, play Bh6 and then launch the h-pawn