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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Bxc6/4...dxc6/5. Nxe5
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Exchange variation Exchange variation
5. Nxe5?
Taking the e5 pawn is a poor move because of the reply 5...Qd4!, forking the knight at e5 and the pawn at e4.
5...Qd4 6. Ng4 Qxe4+ Ne3 and Black gets the pawn back. Any other move for the knight affords Black the opportunity for further damage: 6. Nf3 Qxe4+ 7. Kf1 (7. Qe2 Qxe2+ 8. Kxe2) and White also loses the power to castle.
References
See also
Ruy Lopez