King's Gambit: the Cunningham Bishop

4...Bh4+ looks like a free hit, it drives your king to f1. But the bishop now stands on h4 attacked by the knight on f3, and 5...Nf6?? loses it to 6.Nxh4. The most-played mistake anyone makes against this opening.

• Learn–Easy Memory: drill the points where your lines split.
• Practice–Play whole lines against an opponent that follows your book.
• DrillAll courses–Spaced review of every course's due moves.
• Time–Your prompts against a 60-second clock.
• PuzzlesAll coursesReal games from your positions: find the missed move.
• Arena–Rated games from this opening. Leaving prep costs rating.