411 REFERENCE · Wikibooks
Chess Opening Theory/1. f4/1...e5/2. fxe5/2...d6/3. exd6
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Bird's Opening rd nd bd qd kd bd nd rd pd pd pd pd pd pd pl pl pl pl pl pl pl pl rl nl bl ql kl bl nl rl
3.exd6
After this, Black's only sensible move is Bxd6, developing with a threat. However, Nf6, the Langheld Gambit has also been tried with similar ideas to the mainline but with a Queen on c7 instead of a pawn.
Theory table
+34...
Bxd6Nf3
g5...
Nf6!?