Polish Opening: Czech Defense
The Czech Defense is 1.b4 e5 2.Bb2 d6, where Black defends e5 with the d-pawn instead of hitting the b4 pawn. White builds with c4, e3 and Nc3 to fight for the center, while Black develops behind a solid ...d6 and ...e5 chain.
- Moves
- 1.b4 e5 2.Bb2 d6
- ECO
- A00
- Engine
- +0.08 · level (Stockfish 17.1, depth 20)
- Played
- 1,743 games in our lichess sample
- White scores
- 53.8%
Key ideas for both sides
White
- Play 3.c4, the engine's first choice, then e3 and Nc3 for control of d5.
- Keep a3 in reserve to support b4 if Black starts ...a5 against the queenside.
- The b2 bishop presses e5; a later f4 can add a second attacker against the pawn.
- Develop the king's bishop to e2 and castle short before opening the center.
Black
- Develop with ...Nf6, ...Be7 and ...O-O, keeping the e5 pawn firmly protected by ...d6.
- Use ...c6 to prepare ...d5 later, taking the d5 square away from White's knight.
- Strike at b4 with ...a5 once White has played c4, opening the a-file.
- A kingside fianchetto with ...g6 and ...Bg7 is another way to blunt the b2 bishop.
Plans and pawn structure
Black's ...d6 shuts the f8 bishop's diagonal to b4, so the b4 pawn is safe for now and the game becomes a slow maneuvering fight. White plays on the queenside and in the center with c4, e3, Nc3 and a3, using b4 and b5 for space. Black keeps a sturdy e5 and looks for ...c6 and ...d5, or ...a5 to loosen White's queenside pawns. The position resembles a reversed English with an extra pawn move for White on the b-file.
What the engine plays from here
Stockfish 17.1 at depth 20 rates the position +0.08: level. Its three top choices for White:
- +0.08 3.c4 Nf6 4.e3 Be7 5.Nc3 O-O
- +0.04 3.a3 Nf6 4.c4 g6 5.e3 Bg7
- −0.01 3.e3 Nf6 4.c4 Be7 5.Nc3 O-O
Pawns, from White's side.
How it scores on lichess
1,743 rated lichess games reached this position; White scored 53.8%.
Light: White wins. Grey: draws. Dark: Black wins. About the sample.
How to play against it
As White, play 3.c4 and follow with e3, Nc3 and a3. Do not rush to win the e5 pawn; it is well defended. Keep your queenside pawns compact so ...a5 does not create a weakness on b4. Your edge comes from space, not tactics, so improve pieces before opening lines.
Questions
What are the moves of the Polish Opening: Czech Defense?
The Polish Opening: Czech Defense starts 1.b4 e5 2.Bb2 d6. Its ECO code is A00.
Is the Polish Opening: Czech Defense good for Black?
Stockfish 17.1 rates the position +0.08 at depth 20, which is level. In 1,743 lichess games from our sample, White scored 53.8%. A sensible, low-risk answer for Black players who want a sturdy center, while White needs patience and a clear queenside plan.
What is the main idea of the Polish Opening: Czech Defense?
Black meets the Polish with a solid ...e5 and ...d6 chain, then develops quietly. White builds with c4, e3 and Nc3, using queenside space while the b2 bishop watches e5.
What should White play next?
The engine's first choice is c4, with a3 and e3 close behind. 3.c4 grabs central space and prepares Nc3, giving White a reversed English setup.
Related lines
Updated October 2026. Sources and method.