Good Bishop vs Bad Bishop in Chess: How to Tell Them Apart

A bishop is bad when its own central pawns are fixed on squares of its colour: they block its diagonals and leave it with nothing to attack, because the opponent's pawns end up on the other colour. It is good when it moves on the opposite colour to its pawns. The bishop does not decide which one it is — the pawns do — and that is why it is one of the first things a strong player looks at when assessing a closed position.

What makes a bishop good or bad

A bishop spends the whole game on squares of one colour. Pawns, on the other hand, get stuck on a square and hardly move. That gives you the rule: if your central pawns are on light squares, your light-squared bishop has to work around them, and your dark-squared bishop has a free run.

Three questions are enough to classify it:

• What colour are my central pawns on? The pawns on the c, d, e and f files are the ones that matter. A pawn on h3 barely gets in the way; one on d5 gets in the way a lot.
• Are they fixed? A pawn blocked by an enemy pawn will not move soon, so neither will the bishop's problem. If the pawns can still move, a "bad" bishop can stop being bad in two moves.
• Where are the opponent's pawns? If they are on the bishop's colour, it has targets. If they are all on the other colour, the bishop sees nothing.

A bad bishop is not a worthless bishop: it is still worth what the chess piece values table says, but in that position it does less work. It is a problem of quality, not quantity.

The textbook case: the French Defence

No opening shows the problem as clearly as the French Defence. Black puts pawns on e6 and d5, two light squares, and the bishop on c8 is shut in behind them. When White pushes to e5, the chain is fixed:

Black's light-squared bishop is now the classic bad bishop: its diagonals towards the kingside are blocked by e6, and White's pawns on d4 and e5 sit on dark squares, where it can never attack them. White has the mirror image: the dark-squared bishop is hemmed in by d4 and e5, while the light-squared bishop has an open road towards Black's king.

That is why so many French lines revolve around that bishop. In the Winawer, for instance, Black often plays ...b6 to bring it to a6 and trade it for White's bishop on f1, which is White's good one: 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 b6 followed by ...Ba6. Swapping your bad bishop for the opponent's good one is the cleanest deal there is in this structure.

The same problem in other openings

The French is not alone. What changes from one opening to another is which bishop gets locked in and who suffers it.

The King's Indian

In the King's Indian Defence the bad bishop is the one on g7. In the Classical Variation Black's pawns end up on d6 and e5, two dark squares, and the centre closes with d5:

On paper that bishop is bad: it stares at its own pawn on e5. And yet Black plays this opening on purpose. The bishop defends the king and the dark squares around it, and when Black pushes ...f5 and ...f4 on the kingside it sometimes comes back to life via h6, or returns to the long diagonal once the centre opens. It is the best proof that "bad" describes a position, not a verdict.

The Caro-Kann and the Stonewall

The Caro-Kann solves the French's problem with move order: Black develops the light-squared bishop before closing the chain with ...e6.

The bishop is outside, active, and only then does Black play ...e6. It is the same structure as the Advance French with a better-placed piece.

In the Stonewall structure something similar happens with the bishop on c8: Black's pawns on d5, e6 and f5 are on light squares, and one of the classic ideas is the manoeuvre ...Bd7, ...Be8 and ...Bh5 (or ...Bg6) to bring it out in front of the chain on the kingside.

What to do with a bad bishop

There is no single recipe, but almost every solution falls into one of these four:

• Trade it. The most direct one. Ideally for the opponent's good bishop, the piece that bothers you most; if that is not possible, trading it for a knight that controls key squares also works.
• Bring it out in front of the chain. A bad but active bishop, placed in front of its pawns rather than behind them, attacks squares and creates pressure. That is what the Caro-Kann does with ...Bf5 and what the Stonewall manoeuvre aims for. The catch is that outside the chain the bishop can be harassed by pawn advances such as g4 or h4.
• Open the position. If the pawns that hem it in can move, a break changes everything. In the French, the breaks ...c5 and ...f6 hit White's chain and, by exchanging central pawns, give diagonals back to the bishop.
• Change the colour of your pawns. In the long run, putting the pawns on the other colour turns the bad bishop into a good one. It is slow and not always possible, but in endgames it is often the right plan.

What you want to avoid is the opposite: pushing pawns onto your own bishop's colour for no reason. Every pawn you fix on that colour is one diagonal fewer for good.

Where to put your pawns when you have one bishop

The practical rule that follows from all this, taught since the earliest strategy books, is simple: if you have only one bishop, put your pawns on squares of the opposite colour.

That way they share the work: the bishop controls one colour and the pawns the other. Your pawns do not block its diagonals, and they are also out of reach of the enemy bishop if it is the same colour as yours. Conversely, pawns fixed on the colour of an enemy bishop are targets that bishop can attack all game long.

The rule has exceptions — a pawn that has to advance to promote will do so even onto the wrong colour, and sometimes you have to fix a pawn on your colour to stop one of the opponent's — but as a starting point it rarely fails. The pawn structures guide shows how each named structure divides up the colours.

The bad bishop that defends everything

There is a widely quoted line attributed to the Romanian grandmaster Mihai Suba: bad bishops defend good pawns. It is the other side of the rule, and worth keeping in mind before you rush to trade a bishop just because it carries the label.

A bishop locked behind its pawns is precisely the piece that can defend those pawns. In the French, the bishop on c8 holds the pawn on e6, the heart of Black's whole structure; in the King's Indian, the one on g7 covers the dark squares around the king. Trading it can leave those squares without an owner and open the door to an enemy knight or queen.

So the useful question is not "is my bishop bad?" but "what is my bishop doing in this position, and what happens if I trade it?". A passive bad bishop that defends nothing is a burden. A bad bishop holding the structure together can be the piece that saves the game.

The endgame: bad bishop against good knight

The problem becomes decisive in the endgame. With few pieces left, a bad bishop has nothing to do and the opponent can go after its pawns with the king and another piece. The typical case is good knight versus bad bishop:

White's pawns are on dark squares, so Black's light-squared bishop cannot attack any of them. Black's pawns, on the other hand, are on light squares: they shut the bishop in and stand fixed as targets. The knight jumps to e5, a square no black pawn can attack, and presses from there. White is clearly better: the white king has squares to come in and the black bishop can only defend.

This kind of endgame is learned better by watching strong players handle it than by reading rules. The classes on useful and useless bishops in Masters in Action work on exactly these decisions — when to trade, when to activate, when to defend — and French Defence Deep Dive shows how to live with the bishop on c8 in each system. Both courses are taught in Spanish with English subtitles.

How to train it

• Check the colours before you move. Before moving a central pawn, ask yourself which colour it lands on and what that does to your bishops.
• Review your games. Look for the moment your bishop got locked in: it was almost always a pawn push that was not needed.
• Study games in your opening. If you play the French, the Stonewall or the King's Indian, seeing how masters handle the bad bishop is worth more than any rule.
• Play bishop-versus-knight endgames. They are where a bad bishop loses games, and practising them teaches you not to get there.

And if you have a concrete position where you cannot decide whether to trade your bishop or keep it, that is exactly the kind of question you can put to a master through Ask the GM.