411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nc3/2...Bc5/3. Na4
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Hamppe–Meitner Variation rd nd bd qd kd nd rd pd pd pd pd pd pd pd bd pd nl pl pl pl pl pl pl pl pl rl bl ql kl bl nl rl Vienna Game
3. Na4?!
This move attacks the bishop, but it allows 3...Bxf2+!, a sacrifice, which leads to wild complications favouring Black after 4. Kxf2 Qh4+ 5. Ke3 Qf4+ 6. Kd3 d5, as in the famous Immortal Draw game between Hamppe and Meitner.