King and pawn endgames look simple: almost nothing is left on the board. That simplicity is misleading. With so few pieces, every single tempo matters, and a position can switch from winning to drawn just because of whose turn it is. The concept that explains this is called the opposition, and it is one of the most useful ideas in all of chess.
This guide explains the opposition, shows the two positions every player should know, and gives you a practical rule you can use at the board. All the evaluations below were checked with Stockfish on this site.
What is the opposition?
Two kings are in opposition when they stand on the same file (or rank, or diagonal) with exactly one square between them. Because kings can never stand next to each other, neither king can step forward onto the squares between them.
The key point: the side that does NOT have to move "has the opposition." The side that must move is forced to step aside, and that concession often decides the game.
One position, two results
Look at this position. Nothing changes between the two cases except who is to move.
With White to move, the white king must give way. If it steps to d4, Black answers ...Kd6; if f4, then ...Kf6. Black keeps mirroring, the white king never gets in front of its pawn with room to spare, and Stockfish shows the position as a dead draw.
Now the same position with Black to move:
Black has to step aside — say ...Kf6 — and the white king immediately advances with Kd5, getting in front of the pawn. From there, White escorts the pawn to promotion. The engine gives White a winning advantage of more than six pawns.
The same pieces, the same squares, a completely different result. That is the opposition.
The rule of the sixth rank
There is one situation where the opposition no longer matters because White wins whoever moves: the king stands on the sixth rank directly in front of its pawn (for any pawn except a rook pawn).
With the king that far forward, the pawn's promotion square is controlled no matter how the black king dances. So a practical goal in these endings is: get your king in front of your pawn, as far up the board as possible. The pawn follows the king, not the other way round.
Why "king in front of the pawn" matters so much
Beginners instinctively push the pawn first and bring the king behind. It usually leads to a draw. When the king is behind the pawn, the defending king blocks the pawn's path and holds the opposition easily. When your king is in front, the defending king has to deal with both the king and the pawn, and the opposition gives you a way through.
A useful habit: in a king and pawn ending, move the king first, the pawn last. Only push the pawn when your king has already secured the squares in front of it.
How to use the opposition at the board
When you reach a king and pawn ending, go through three questions:
- Can my king get in front of my pawn? If yes, do that before pushing.
- When the kings meet, who will have to move? Count the moves. If you would have to give way, look for a spare pawn move (a tempo move) somewhere else on the board, or a triangulation manoeuvre with the king to lose a move.
- Is it a rook pawn? Pawns on the a- or h-file are special: if the defending king reaches the corner, it is usually a draw regardless of the opposition.
Distant and diagonal opposition
The basic version has the kings one square apart. There are extended forms:
- Distant opposition: kings on the same file with three or five squares between them. The same logic applies — the side not to move will be able to take the close opposition later.
- Diagonal opposition: kings on the same diagonal with one square between. Useful when the direct route is blocked.
You rarely need to calculate these consciously. Understanding the basic version and counting tempo carefully gets you through most practical endings.
Triangulation in one paragraph
Sometimes neither side has a spare pawn move, and you need to "lose" a move to hand over the obligation to move. Triangulation does that with the king: you walk around a small triangle of three squares, returning to your starting square in three moves, while the defending king — confined to fewer squares — can only return in two. The positions end up identical except for whose turn it is. It's an advanced idea, but worth knowing it exists: when a king and pawn ending looks stuck, look for a triangle.
Common mistakes
- Pushing the pawn too early. The king should lead; the pawn follows.
- Forgetting spare tempo moves. Having an extra pawn move elsewhere can flip the opposition in your favour.
- Trading into a pawn ending without counting. Before exchanging the last pieces, check whether you will get the opposition. Many won games are drawn — or lost — because of this.
- Panicking about stalemate. With the king in front and the right technique, stalemate is avoidable. It mainly happens when the pawn reaches the seventh rank with the kings in the wrong relationship.
Practice it
Open any of the three diagrams with Play this position against the computer and try to reach the evaluation shown: win from the second and third diagrams, hold the draw as Black from the first. Then try the first diagram as White and confirm for yourself that you cannot win. For the next step, learn the rule of the square — the other essential tool of pawn endings — or play a full game and aim to trade into a pawn ending you know is winning.
Frequently asked questions
What does it mean to have the opposition?
When the kings face each other with one square between them, the side that does not have to move has the opposition. The side to move must step aside and give up ground.
Is the opposition only used in pawn endgames?
It matters most in king and pawn endgames, but the idea appears in rook endings and other positions where the kings fight for key squares.
Why does the rook pawn draw more often?
Because the defending king can take refuge in the corner in front of the pawn, and the attacking side cannot drive it out without stalemating it. The usual winning methods need space on both sides of the pawn.
How do I win the opposition if I don't have it?
Use a spare tempo — a pawn move elsewhere on the board — or triangulate with your king, taking three moves to return to a square the opponent can reach in two. Either way, you hand the obligation to move back to your opponent.
