Chessy
Playing the Rat Defense: Small Center Defense with ...d5 as Black
After 1.d4 e6 2.e4 d6 3.d5 exd5, you've reached the Rat Defense: Small Center Defense. White is on move, and the position is dead level — Stockfish gives +0.08, an edge so tiny it's practically zero. That means nothing went wrong: you've navigated the opening perfectly. In the Lichess database of over 70,000 games, Black actually scores a hair higher (48.0%) than White (47.3%), with only 4.8% draws. The drill below will test how you handle what comes next.
Play the Rat Defense: Small Center Defense: d5 against the engine
Free, no signup — you play black, the engine adapts to your level.
Jump into the interactive drill below and practise the Rat Defense: Small Center Defense with ...d5. The engine adapts to your level so you can learn the main 4
Create a free account →What the Statistics Tell You
The numbers from 70,504 games at this position are remarkably balanced. White wins 47.3%, Black wins 48.0%, and draws are rare at 4.8% — this is a fighting opening where both sides play for a win. The engine evaluation (+0.08) backs up the data: you haven't made a mistake, and White hasn't either. Your task now is to choose the right continuation and build on this equality. The most popular move for White by far is exd5 (53,592 games), which leads into a typical Kingside Fianchetto setup after g6, Nf3, Bg7. That's the main line you should be ready for.
The Engine's Best Continuation
Stockfish recommends that White recapture with exd5, and then the best response for you — the engine line — is g6, preparing to fianchetto the light-squared bishop. The full suggested sequence is: exd5 g6 Nf3 Bg7. This setup is solid and principled: you develop your kingside pieces, castle quickly, and put pressure along the long diagonal. The bishop on g7 will eye the d4-pawn and the centre, giving you active counterplay. Learning this simple, natural setup is the most reliable way to maintain your equal position.
Punishing White's Mistakes
Not every opponent will play the best move. The most common alternative is Qxd5 (15,967 games), but the engine calls this an inaccuracy — it loses roughly 0.6 pawns of advantage compared to exd5. Black's overall score against Qxd5 is actually slightly better (White scores only 46.1%). Even worse for White are Nc3 (a mistake, losing ~1.6 pawns) and e5 (a blunder, losing ~3.5 pawns). While these appear far less often in practice, you should be ready to seize the opportunity. In the drill, the engine will adapt to your level and may play these weaker moves so you can practise punishing them.
The Kind of Game You're Heading For
By choosing the Rat Defense: Small Center Defense with ...d5, you're steering toward a closed, strategic middlegame. White's d4-pawn versus your d6-pawn creates a semi-blocked centre where piece play and pawn breaks matter more than open lines. Your king will be safe on the kingside after fianchettoing, and your g7-bishop gives you long-range influence. This opening suits players who enjoy manoeuvring rather than sharp tactical skirmishes — you get a sound, equal position with plenty of room to outplay your opponent in the middlegame.
Results across 70,504 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| exd5 | 53,592 | 47.8% |
| Qxd5 | 15,967 | 46.1% |
| Nc3 | 187 | 39.0% |
| e5 | 158 | 25.9% |
| Qe2 | 137 | 38.0% |
| Bb5+ | 87 | 32.2% |
Frequently asked questions
Is the Rat Defense: Small Center Defense a good opening for Black?
Yes, it leads to a very balanced game. Stockfish evaluates the position after 3...exd5 as +0.08 — essentially dead equal. In practice Black scores 48.0% across thousands of games, which is slightly better than White's 47.3%. You're not taking any unnecessary risks, and you get a solid, fighting position.
What is the best move for White after 3...exd5?
The engine says exd5 is best. That's also by far the most popular move in practice (53,592 games). White recaptures with the pawn and the game continues with you playing g6, preparing Bg7. The other recapture, Qxd5, is an inaccuracy that loses about 0.6 pawns of advantage for White.
Should I be worried about White playing e5?
No — e5 is actually a blunder! It only appears in 158 games and White scores a miserable 25.9% from it. The engine says it loses about 3.5 pawns. If your opponent pushes e5, you're already in a very favourable position. The drill will help you practise punishing these kinds of mistakes.
How do I continue after the main line exd5?
The engine's recommended continuation is g6, followed by Nf3 and Bg7 from White. You fianchetto your king's bishop, get ready to castle, and keep the position solid. There's no rush to force anything — you have a perfectly equal game and plenty of chess ahead.