Caro-Kann: Réti–Tartakower Trap

After 4...Nf6 5.Qd3, Black's premature 5...e5?? runs into 8.O-O-O and the crushing 9.Qd8+!! queen sacrifice mating by force, and the more common 5...Bf5? drops a piece to 6.Nxf6+ and 7.Qxf5; declining with 5...Nxe4 keeps Black safe but hands White an easy game.

• 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.