Opposite-colored bishops means each side has one bishop, and those bishops never travel on the same squares. One lives on light squares. The other lives on dark squares. They cannot capture each other, and they cannot challenge each other for a square. That single fact turns many pawn-up endings into draws, and it turns some equal endings into one-sided attacks.

Why the extra pawn often draws

The defender parks the king and the bishop on the squares the enemy bishop does not control, directly in front of the passed pawn. The attacker cannot drive that blockade away with the bishop, because the bishop does not touch those squares. A protected blockade on the color the attacker cannot attack is a fortress.

This is why, if you are a pawn up and you still have a choice of trades, you should think twice before trading into bishop versus bishop of opposite colors with all the pawns on one wing. The same trade with pawns on both wings is much more interesting, because the defender's bishop can only cover one color and the second wing becomes a second problem.

💡 Chess Hint: One passed pawn, one wing, opposite bishops: assume a draw until you see a second weakness. Two widely separated passed pawns: assume the attacker wins.

How the attacker wins anyway

Create two threats that live on different wings. A passed pawn on the a-file and a passed pawn on the h-file cannot both be blockaded by one king and one bishop if they are far enough apart. Push the pawn the defender is not currently stopping. When their king runs to catch it, advance the other one.

Your bishop's job is to take away the squares of its own color that the enemy king would use to cross, and to defend your pawn from a distance. Do not put the bishop in front of your own passer. Put it on a long diagonal where it defends the promotion square and still eyes the other wing.

The middlegame version

Opposite-colored bishops with queens on the board are not drawish. They are dangerous. Your bishop attacks squares the enemy bishop cannot defend. A light-squared attack against a king whose dark-squared bishop is the only minor piece left is often worth a pawn. Point your queen and bishop at the same color complex around their king, and do not trade queens unless the ending is one of the winning shapes above.

If you are defending, trade queens. The fortress exists in the ending. It does not exist while the queen can sacrifice itself to strip the pawn shield.

The trade decision

Before you exchange the last pair of knights, or a bishop for a knight, look at the pawn count and the wings. Ahead by a pawn with everything on the kingside, keeping a knight or a same-color bishop gives you better winning chances than opposite bishops. Behind by a pawn, offering the trade into opposite bishops is one of the best defensive resources you have. The general trade rules are in when to trade pieces.

Frequently Asked Questions

Do opposite-colored bishops always draw?

No. They draw when the defender can blockade the only passed pawn on a square the enemy bishop does not attack. Two passed pawns, or queens still on the board, change the evaluation.

What if there are rooks as well?

Rooks can attack both colors, so the drawing tendency is weaker. The bishop still cannot challenge the enemy bishop, and an attack on one color remains a real plan.

Which bishop is better?

The one that matches your plan. If their king is exposed on light squares, you want the light-squared bishop. In a pure ending, you want the bishop that controls the square in front of your passed pawn from a distance, not the one that sits in its way.

One color is a fortress, two wings are a win

Decide which game you are playing before you trade. If you want the ending to stay sharp, keep another piece on the board. Check a suspicious trade with chess hints before the bishops are the only minor pieces left.

Analyze a position Converting material

Try the line on the board with chess hints.