Chessy
Play the Czech Defense: Nf3 as Black
The Czech Defense is a solid, modern way to meet 1.e4. After 1.e4 d6 2.d4 Nf6 3.Nc3 c6 4.Nf3 g6, you’ve built a sturdy hedgehog-like structure while keeping the tension. The engine evaluates this position at +0.72 — a clear edge for White, so you are worse from the start of the theory. But don't let that discourage you: practical results from over 187,000 games show Black scoring a healthy 46.6%, with White winning 49.1% and 4.3% draws. This is a fighting opening where understanding the key moment makes all the difference. Let's find it together.
Play the Czech Defense: Nf3 against the engine
Free, no signup — you play black, the engine adapts to your level.
Now put this into practice. Play the position from Black's side against our adapting engine — see if you can punish 5.e5 and hold your own against the best move
Create a free account →What You're Fighting For
Your setup after 4...g6 is flexible and sound. You're preparing to fianchetto your dark-squared bishop to g7, which will pressure the long diagonal. Your pawn on c6 supports a future ...d5 break, challenging White's centre directly. The position is rich in plans: you can aim for ...Bg7, ...0-0, and then either ...d5 or ...e5, depending on White's setup. The engine sees a small White edge (+0.72), but that advantage requires accurate play. In practice, White scores only 49.1% — barely above half. That means if you know your ideas, you can outplay most opponents from this position.
The Engine's Suggestion: Be3
Stockfish's best move here is Be3, with the follow-up Bg7 Qd2 b5. White develops the bishop to e3, eyeing the queenside and preparing Qd2 to connect rooks and perhaps castle long. Black's natural reply is 5...Bg7, getting the fianchetto going. Then after 6.Qd2, the engine suggests 6...b5 — a dynamic queenside expansion that eyes ...b4 to challenge the knight on c3. This shows the Czech Defense isn't just passive: you have active counterplay available. Even in the engine's main line, Black is fighting for space and initiative.
What the Statistics Reveal
Here are the most popular moves White plays and how Black scores against each (from 187,165 games): - 5.Bg5 (44,514 games) – White scores 49.3%. Pinning the knight, but Black can break the pin with ...h6 or ...Bg7 and ...0-0. - 5.Bd3 (35,039 games) – White scores 48.7%. A natural developing move, but Black's setup handles it well. - 5.Bc4 (31,547 games) – White scores 50.5%. The sharpest try, eyeing f7, but Black has ...b5 ideas. - 5.e5 (22,586 games) – White scores only 47.4%! This pawn push is actually Black's best-scoring reply statistically. - 5.Be3 (16,442 games) – White scores 50.2%. The engine's first choice, but Black still holds up. - 5.Be2 (12,802 games) – White scores 49.5%. A quiet move. Notice that no White move cracks the 51% mark — your position is fully playable.
The One Mistake to Avoid
The only known inaccuracy in this position is 5.e5 — for White, not Black. That's right: if White pushes 5.e5, they lose about 0.6 pawns of advantage compared to the best move (Be3). The engine considers 5.e5 an inaccuracy. From Black's perspective, that's the moment to be alert. After 5.e5, Black can play ...dxe5 6.dxe5 Qxd1+ 7.Kxd1 Ng4, winning the e5 pawn and emerging with a comfortable position. If you see 5.e5 on the board, know that White has made your life easier — just don't miss the tactical follow-up.
Results across 187,165 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Bg5 | 44,514 | 49.3% |
| Bd3 | 35,039 | 48.7% |
| Bc4 | 31,547 | 50.5% |
| e5 | 22,586 | 47.4% |
| Be3 | 16,442 | 50.2% |
| Be2 | 12,802 | 49.5% |
Frequently asked questions
Is the Czech Defense a good opening for Black?
Yes, it's a solid, straightforward system. After 1.e4 d6 2.d4 Nf6 3.Nc3 c6 4.Nf3 g6, the engine gives a +0.72 edge for White, which is a typical healthy advantage from the opening. But Black scores 46.6% in practice, meaning it's a fighting and fully playable choice for club players.
What is the best reply to 5.Be3 in the Czech Defense?
The engine's main line continues 5...Bg7 6.Qd2 b5. You fianchetto your bishop and then start queenside expansion with ...b5, threatening ...b4 to harass the knight on c3. This gives Black active counterplay.
How should Black handle 5.Bg5?
5.Bg5 pins the knight to the queen. Black can reply with ...Bg7, ...0-0, and then ...h6 to ask the bishop what it wants. If it retreats, you've gained a tempo. If it exchanges on f6, your doubled pawns aren't too bad since you still have the bishop pair and a solid centre.
Is 5.e5 a mistake for White?
The engine calls 5.e5 an inaccuracy, losing about 0.6 pawns compared to 5.Be3. Black can play ...dxe5 6.dxe5 Qxd1+ 7.Kxd1 Ng4, winning the e5 pawn. Statistically, White scores only 47.4% after 5.e5 — their lowest score among all major moves.