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Chess Opening Theory/1. e4/1...Nf6/2. Bc4/2...Nxe4/3. Bxf7/3...Kxf7
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Krejcik variation B02 Alekhine's defence → Krejcik variation → 3. Bxf7+
3...Kxf7
White can take the knight in trade for their bishop through the manoeuvre 4. Qh5+ 5. Qd5+ 6. Qxe5, and material will be equal.
Theory table
4. Qh5+ Kg8 5. Qd5+ e6 6. Qxe4 d5 7. Qe2 e5 8. Qxe5 Nc6 9. Qe3 -- Krejcik variation
References
See also
Alekhine Defence