Bishop's Opening: Calabrese Countergambit, Jaenisch Variation

This opening starts with a simple idea: develop quickly, keep your king safe, and let Black take the risk. After 3.d3, you are not trying to force an attack immediately. Instead, you want a sound setup and a position where Black has to prove compensation for the pawn push to f5. The engine's evaluation of +0.65 shows that White has a small edge, so you should feel free to play for the better game rather than just surviving. If Black becomes careless, the position can swing in your favour very quickly.

The best move here is Nf6. That is the move the drill will expect you to face most often, and it is also the engine's top choice. The common follow-up in the engine line is Nf6 Nf3 Nc6 O-O, which shows the kind of development race you should be ready for. In practical terms, that means you should stay alert, finish development, and make Black work for every tempo.

The database gives a useful picture of how this position usually goes. Across 95,385 games at this exact position, White wins 52.3%, draws 2.9%, and Black wins 44.8%. That is consistent with the engine's positive assessment for White. The most-played continuation is Nf6 with 68,474 games, and White scores 50.1% there, so it is the key branch to understand first. The other replies appear less often, but they are worth knowing because some of them give White even better chances.

Two replies are especially important to recognise because they are outright blunders. fxe4 is a blunder and loses about 3.2 pawns; the better move was Nf6. f4 is also a blunder and loses about 4.9 pawns; again, Nf6 was better. Bc5 is less severe but still a mistake, losing about 1.6 pawns; the better move was Nc6. In the drill, train yourself to notice when Black chooses one of these inaccurate options, because you can often gain a clear advantage simply by playing correctly and not missing the chance.