411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Bc4/2...Nf6/3. f4/3...Nxe4/4. fxe5
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Bishop's Opening: Berlin Defence, Greco Gambit
Bishop's Opening: Berlin Defence, Greco Gambit
4. fxe5??
White got way too greedy and captured the seemingly free pawn on e5, but at a cost: 4...Qh4+! starts an overwhelming attack on White's king which will either win material or checkmate White.