Chess Opening Theory/1. e4/1...Nf6/2. Bc4/2...Nxe4

= Alekhine Defence: Krejcik Variation = White's only way to recover the pawn back is 3. Bxf7+. This move may seem like a horrible blunder that loses a bishop, but in fact it wins a knight instead. This move also prevents the king from castling, but the black king will be in a relatively safe position after 3... Kxf7 4. Qh5+ Kg8 5. Qd5+ e6 6. Qxe4 d5!

Theory table
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 * '1.e4 Nf6 2. Bc4 Nxe4'