411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...Bc5/5. Nxf7/5...Bxf2/6. Kf1/6...Qe7/7. Nxh8
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Traxler Variation rd bd kd nl pd pd pd pd qd pd pd nd nd pd bl pl pl pl pl pl bd pl pl rl nl bl ql kl rl Two Knights Defence
7. Nxh8
At the moment, White has a deceivingly uncoordinated attack on the Black king, but things can go very wrong very fast if Black allows moves like Bf7+ or Qh5+, preventing the Black king from ever castling to safety. For this reason, Black cannot afford a tempo moving their f2 bishop away or capturing with Nxe4. Instead, their best move is to cut off White's bishop with the move 7...d5.
This is not simply a free pawn, and leads to interesting offensive opportunities for Black.
Traxler Variation