Blackmar-Diemer Gambit: Blackmar Gambit – Nf6 (White)

The engine says -0.75 — that's a real advantage for Black if both sides play perfectly. But you aren't playing against a perfect opponent. Across nearly 2.7 million games from this position, White scores a whopping 53.1% win rate with only 3.1% draws. That means you win more than you lose, even while down a pawn. The reason is simple: Black has to navigate a minefield. One weak move, and your attack erupts. The statistics confirm that most club players mishandle this position, so trust the practical chances more than the raw evaluation.

When Black plays exf3 (the engine's best move and the most common by a landslide, appearing in over 2.1 million games), you continue with Nxf3. From there, the engine suggests g6 and Bf4 as solid developing moves. Even though this line is best for Black, White still scores 53.9% — your highest winning percentage of any major Black reply. Why? Because Black's king is often stuck in the centre for a while, and your knights become very active. Nxf3 eyes e5 and g5 squares, and you'll follow up by completing development (Bg5, Bd3, O-O) with dangerous attacking chances against a still-uncastled king.

Your opponents will often slip up. Here are the three most common errors from this position and what you gain from each: - Nc6 (played over 122,000 times): An inaccuracy that loses ~0.6 pawns of advantage. Black develops a piece but neglects the centre fight. You can now recapture on f3 cleanly (exf3) and enjoy a smoother game, as Black has wasted time. - e6 (played nearly 96,000 times): A mistake that costs ~1.1 pawns. Black blocks their light-squared bishop and fails to capture on f3. Take back with exf3 immediately — your pawn centre stays intact, and Black's position becomes passive and cramped. - e5 (played over 37,000 times): A mistake losing ~1.2 pawns. Black tries to fight for the centre but leaves the f3-pawn hanging. Capture with exf3 and get ready to exploit the gaping f5-square and Black's weak d5-pawn. In this line, White scores only 45.1%, which tells you Black often recovers — so stay sharp!

The second most popular move, Bf5 (over 209,000 games), is Black's attempt to develop and control e4. Here White scores 49.0% — slightly below average, so respect it. The key idea: don't rush to recapture on f3. Black's bishop on f5 pins the f3-pawn indirectly, so you might consider g4 or Nge2 to chase the bishop and prepare the recapture. Your plan is still to open the f-file, develop with Bg5 and Bd3, and castle long or short depending on where Black's king goes. Keep up the pressure and don't let Black consolidate the extra pawn comfortably.