411 REFERENCE · Wikibooks
Chess Opening Theory/1. f4/1...e5/2. fxe5/2...d6/3. exd6/3...Bxd6/4. h4/4...Bg3
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Bird's Opening rd nd bd qd kd nd rd pd pd pd pd pd pd pl bd pl pl pl pl pl pl rl nl bl ql kl bl nl rl
4...Bg3#
This unexpected move checkmates the white king along the e1-h4 diagonal in a resounding fashion.
1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.h4?? Bg3#