411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. d4/4...exd4/5. O-O/5...Nxe4/6. Nc3/6...dxc3/7. Bxf7/7...Kxf7/8. Qd5/8...Ke8
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Nakhmanson Gambit rd bd qd kd bd rd pd pd pd pd pd pd nd ql nd pd nl pl pl pl pl pl pl rl bl rl kl
Nakhmanson Gambit, Ke8 Defence
8...Ke8
The immediate 9.Qxe4+ would be a blunder allowing the Black queen to start chasing the White one around threatening to trade.
But since the e4-knight has to be captured before it retreats to f6, the only move here is 9. Re1.