411 REFERENCE · Wikibooks
Chess Opening Theory/1. f4/1...e5/2. fxe5/2...d6/3. exd6/3...Bxd6/4. h4
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Bird's Opening rd nd bd qd kd nd rd pd pd pd pd pd pd bd pl pl pl pl pl pl pl rl nl bl ql kl bl nl rl
4.h4??
This is a blunder, as it defends against 4...Qh4 but falls to another mate.
Theory table
+4...
Bg3#0-1