Chessy
Bishop's Opening: Paulsen Defense — Bg5 (For Black)
You've stepped into a lively line of the Bishop's Opening. After 1.e4 e5 2.Bc4 Nf6 3.d3 c6 4.Bg5, the natural 4...d5 is your counter-punch, immediately challenging White's centre and threatening to kick the bishop on c4. The position is a real battleground: across 106,348 games, Black scores a solid 50.8% — well ahead of White's 45.4%. The engine gives -0.49, a small edge for Black, so things look good for you from the start. Your task now is to navigate the critical next move and handle White's main replies. The interactive drill below will put you in the hot seat — let's see how you handle it.
Play the Bishop's Opening: Paulsen Defense: Bg5 against the engine
Free, no signup — you play black, the engine adapts to your level.
Now put these ideas into practice. The interactive drill below will test you against White's best and worst replies — play through the position as Black and see
Create a free account →What You're Fighting For: Central Tension
The clash in the centre defines this entire line. White's pawn on e4 and your pawn on d5 are staring each other down, while your pawn on c6 supports ...d5. White's light-squared bishop on c4 and the bishop on g5 both point at your king's side, so your immediate task is to decide how the centre resolves. If White captures exd5, you recapture with cxd5 — opening the c-file for your rook and gaining a pawn majority in the centre. If White retreats the bishop with Bb3, you've already gained time by kicking the c4-bishop. If White trades on f6 with Bxf6, you recapture with the queen, keeping your strong pawn centre intact. Your edge comes from White's difficult choice: every option has a downside, and the statistics show you score well in all of them.
The Engine's Best Reply: exd5 (and What You Do Next)
White's best — and by far most popular — move is exd5, played in 87,978 games. After exd5 cxd5, White's strongest continuation is Bb3, retreating the bishop to safety. From there, you bring your knight to c6, developing naturally and eyeing the centre. You now have a classic IQP (isolated queen's pawn) structure: you have a pawn on d5 and open lines for your pieces. Your plan is straightforward: develop quickly, castle, and put pressure on the d5-pawn's neighbours or use it as a lever for a later ...d4 break. Black scores a healthy 45.0% White win rate here — meaning you win or draw over 55% of the time. You're doing fine.
Where White Goes Wrong: Three Blunders to Punish
The statistics flag three clear blunders White can make — if you see any of these, you're winning immediately. Nf3 (165 games) loses about 3.2 pawns; White should have taken on d5 instead. Nc3 (77 games) loses roughly 3.8 pawns. And Qf3 (48 games) is the worst, losing about 4.2 pawns. In each case, the engine says White's best was simply exd5. What do you do against Nf3, Nc3, or Qf3? You capture on e4 — White's knight or queen moves, and you've won a central pawn while ruining White's structure. Keep an eye out for these moves: they're rare but devastating for White if you react correctly.
The Retreat: Bb3 (2,885 Games)
If White plays Bb3 immediately (instead of exd5 or Bxf6), you've already achieved something: the bishop has moved twice before castling. With 2,885 games and White scoring just 43.7%, this is actually your best statistical outcome (from a win-rate standpoint). Your plan remains simple: develop your knight to c6, put your bishop to e7 or d6, castle, and you'll have comfortable play with a slight edge. The bishop on b3 is harmless for now — it's your centre that matters. The key: don't rush; build up pressure step by step.
Results across 106,348 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| exd5 | 87,978 | 45.0% |
| Bxf6 | 15,008 | 48.7% |
| Bb3 | 2,885 | 43.7% |
| Nf3 | 165 | 27.3% |
| Nc3 | 77 | 35.1% |
| Qf3 | 48 | 27.1% |
Frequently asked questions
Is the Bishop's Opening: Paulsen Defense Bg5 a good opening for Black?
Yes — Black scores a solid 50.8% across over 106,000 games, with only 45.4% going White's way. The engine also gives -0.49, a small but clear edge for Black. It's a practical, sound choice for club players.
What is the best move for White after 4...d5 in the Paulsen Defense?
Stockfish recommends exd5, which is also by far the most popular move (87,978 games). After exd5 cxd5, White's best follow-up is Bb3, and you develop your knight to c6. White avoids this at its peril: moves like Nf3, Nc3, or Qf3 are all blunders.
Why is Black doing so well in this line of the Bishop's Opening?
Black's ...d5 immediately challenges White's centre and forces a decision. White's bishop on c4 is awkwardly placed, and the bishop on g5 can become a target. Black also scores well against White's alternatives — even the most popular capture exd5 leads to comfortable play. The numbers don't lie.
What should I do if White plays Nf3 or Nc3 in this position?
Both are blunders. Capture on e4 with your d5-pawn (dxe4) — White loses a central pawn or must give up even more material to save the knight. The engine rates Nf3 as losing ~3.2 pawns and Nc3 as losing ~3.8 pawns. Don't hesitate to take.
How many games feature the Bishop's Opening: Paulsen Defense: Bg5?
Over 106K Lichess games have reached the Bishop's Opening: Paulsen Defense: Bg5 position. White wins 45.4%, Black wins 50.8%, with 3.8% draws — based on real rated games.