411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. e4/2...dxe4/3. Bc4/3...Nc6/4. Qh5
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Blackmar-Diemer Gambit (BDG)
4. Qh5
White threatens to win a queen by checking on f7. Black should play g6 to stop the threat. However, if he, in his hotheaded desire plays Nf6??, Black faces doom with Qxf7+ Kd7 Be6+ Kd6 Bf4+ Ne5 Bxe5+ Kc6 Nc3 Bxe6 Qxe6+ Qd6 Bxd6.
Blackmar-Diemer Gambit (BDG) rd bd qd kd bd nd rd pd pd pd pd pd pd pd nd ql bl pl pd pl pl pl pl pl pl rl nl bl kl nl rl