411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. f4/2...Bc5/3. fxe5/3...Qh4/4. Ke2
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King's Gambit Declined 4.Ke2??
pl qd pl bl rl nl bl ql nl pl rl pl pl kl pl pl pd rd nd bd kd nd rd pd pd pd pd Bird's Opening pd pl bd pd
This is a blunder on white's part. The only other legal move would be to play 4. g3, which would force Black's queen to retreat. This move leads to checkmate if Black plays 4...Qxe4#.
Theory Table
+4567King's Gambit DeclinedKe2 Qxe4#0-1