411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Bc5/4. b4/4...Bxb4/5. c3/5...Ba5/6. d4/6...Nf6/7. dxe5/7...Ng4/8. Bg5/8...f6/9. exf6/9...gxf6/10. Bh4
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Evans Gambit Accepted: Laroche Variation
10. Bh4
White retreats their g5 bishop to h4. White is simply better as Black's kingside pawn structure is ruined and Black's king is weak while material is equal. This is why 6...Nf6? is a mistake.