411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...d6/3. d4/3...Nd7/4. Bc4/4...Ngf6/5. dxe5/5...Nxe5/6. Nxe5/6...dxe5/7. Bxf7/7...Kxf7/8. Qxd8/8...Bb4/9. Qd2/9...Bxd2
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Hanham variation C41 Philidor defence → Hanham variation → 9. Qd2
9...Bxd2+
Black regains the lost queen with check.
Black is also threatening ...Nxe4. 10. Nxd2 is the only recapture that also prevents that, and White remains up a pawn for good.
References
See also