Vienna Game, Würzburger Trap

The Würzburger Trap is a chess opening trap in the Vienna Gambit. It was named around 1930 for German banker Max Würzburger.

The trap
'''1. e4 e5 2. Nc3 Nf6 3. f4'''
 * White plays the Vienna Gambit.

3... d5
 * Thought to be the best reply.

'''4. fxe5 Nxe4 5. d3'''
 * White also has lines beginning 5.Qf3 (Steinitz) and 5.Nf3, but neither achieves an advantage.

5... Qh4+
 * Initiating the trap. Black has other choices 5...Bb4 and 5...Nxc3.

'''6. g3 Nxg3 7. Nf3 Qh5 8. Nxd5 Bg4'''
 * 8...Nxh1? 9.Nxc7+ Kd8 10.Nxa8 leads to advantage for White.

9. Nf4
 * White can obtain the better game with 9.Bg2 Nxh1 (9...Bxf3 10.Qxf3 Qxe5+ 11.Kd1 Nxh1 12.Bf4 Qxb2 13.Qe4+ Hamann–Schvenkrantz, Germany 1965; 10...Qxf3 11.Bxf3 Nxa1 12.Nxc7+ Kd7 13.Nxa8 Bc5 14.Bxh1 Nc6 15.Bf4 Arhangel'skij–Popov, USSR 1958; Larsen) 10.Nxc7+ Kd7 (10...Kd8 11.Nxa8 Nc6 12.d4 Bxf3 13.Qxf3 Qxf3 14.Bxf3 Nxd4 15.Bg5+ Be7 16.Rd1+−; Larsen) 11.Nxa8 Nc6.

'''9... Bxf3 10. Nxh5 Bxd1 11. hxg3 Bxc2?'''
 * Black tries to win a pawn, but instead loses a.

12. b3
 * The black bishop on c2 is trapped; White will win it by playing Kd2 next turn.