Opposite-Colored Bishops: the drawing tendency you should know

There’s a saying in chess: “opposite-colored bishops, half a point guaranteed.” It’s an exaggeration, but it has a real basis. These endgames are the hardest to win in chess, even with one or two extra pawns.

Why? Because when the bishops operate on different colors, it’s as if they live in parallel universes. They don’t get in each other’s way, don’t attack each other, and can’t kick each other off any diagonal. That changes all the rules.

Why they tend toward draws

The key is that the defending bishop can block the promotion diagonal of the pawn, and the attacking bishop can’t do anything about it. The strong side’s bishop controls one color; the promotion square is on one color; if the defending bishop covers that color, it’s immune.

It’s like trying to move a piece that’s in a different dimension from yours. It doesn’t matter how many extra pawns you have if your bishop can’t kick the rival bishop off the diagonal blocking promotion.

When it actually is won

Not every opposite-colored endgame is a draw. It can be won when:

1. Passed pawns on separated flanks

If you have two passed pawns, one on the king’s flank and one on the queen’s, the defending bishop can’t cover both promotion squares at once (one will be light, the other dark). This is the most important exception.

2. The king penetrates

If the strong side’s king can infiltrate and attack the rival’s pawns, the material advantage can be decisive even with opposite-colored bishops. The bishop blocks, but the king attacks from the other side.

3. The pawns create zugzwang

In positions where the defender runs out of useful moves, zugzwang can force concessions. But this requires a very specific position.

How to defend (when you’re worse off)

If you’re down a pawn and reach an opposite-colored bishop endgame, take a breath: you can probably draw. The technique is:

1. Place your bishop on the promotion diagonal. As long as your bishop covers the square where the pawn promotes, the rival can’t win.
2. Don’t move the bishop off that diagonal unnecessarily. It’s your life insurance.
3. Centralize the king. Although the bishop blocks promotion, the king needs to watch that you’re not infiltrated from another side.
4. Don’t trade pawns on the wrong flank. If the rival has separated passed pawns, every pawn you take away reduces their chances of winning.

The middlegame trap

Warning: in the middlegame with rooks and queens still on the board, opposite-colored bishops don’t favor the defender. On the contrary: they favor the attacker because the attacking bishop controls squares the defending bishop can’t cover. It’s a powerful offensive weapon in positions with major pieces.

The drawing tendency only appears once the major pieces are simplified and the endgame reduces to king, bishop, and pawns.

Practical rule

• One extra pawn with opposite-colored bishops: almost always a draw.
• Two extra pawns on the same flank: probable draw.
• Two extra pawns on different flanks: probable win.
• Three extra pawns: near-certain win.

Keep learning

• Good bishop and bad bishop — the base of the concept
• Bishop vs knight — when each piece wins
• Minor piece endgames — all the articles in this section
• Pawn endgames — the fundamentals