Chess Opening Theory/1. e4/1...Nf6/2. Bc4/2...Nxe4/3. Bxf7/3...Kxf7

=Alekhine Defence:Krejcik Variation= To regain the knight, White should play 4. Qh5+.

Theory table
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'1.e4 Nf6 2. Bc4 Nxe4 3.Bxf7+ Kxf7'