In a king and pawn ending, only kings and pawns remain, and the result often depends on who can promote a pawn first or whose king stands better. Three ideas cover most cases: the rule of the square, opposition, and key squares. Learn them and you will convert or hold many endings, and you will also avoid the simple slips that turn a win into a draw.
Idea one: the rule of the square
Use it to see if a king can catch a passed pawn. Draw an imaginary square from the pawn to the promotion rank, with sides equal to the number of squares the pawn must travel. If the defending king can step inside that square, it catches the pawn. If not, the pawn promotes.
Example: a white pawn on e5 needs three moves to reach e8, so the square runs from e5 to e8 and across to h5 to h8. A black king on h6, with Black to move, is already inside that square, so it catches the pawn. A black king on a-file squares outside it cannot.
Two details matter. First, a pawn on its home rank may move two squares on its first move, so treat it as if it stood one rank further forward when you draw the square. Second, check whose turn it is. If the pawn’s side is to move, the pawn gains a move, so a defending king must already be inside the square. If the defender is to move, a king standing on the edge of the square still catches the pawn.
Idea two: opposition
Opposition is when the two kings face each other with one square between them, and the player who does not have to move holds it. The player forced to move must step aside and give ground.
- Place your king in front of your pawn, with the enemy king in front of it.
- Use the opposition so the enemy king must step back or aside.
- Advance your king to a key square, then bring the pawn forward.
- Keep going until the pawn promotes.
Idea three: key squares
| Pawn position | Key squares for the attacking king |
|---|---|
| Pawn on its 2nd to 4th rank (e.g. e4) | The three squares two ranks ahead (d6, e6, f6) |
| Pawn on its 5th rank (e.g. e5) | The three squares one rank ahead (d6, e6, f6) |
| Rook pawn (a or h file) | Usually drawn if the defending king reaches the corner |
If your king reaches a key square, the pawn can promote, whoever moves. For example, a king on e6 in front of a pawn on e5 wins whichever side is to move, provided it is not a rook pawn.
Habits to remember
- The king is a strong piece here; bring it forward early.
- Keep the king in front of the pawn, not behind.
- Count moves before racing.
- Avoid stalemate when the defender has no legal move but is not in check.
Walkthrough: Winning the Opposition Step by Step
Take this position. White has a king on e5 and a pawn on e4. Black has a king on e7. The kings face each other on the e-file with one empty square, e6, between them.
- Decide who is to move. If White is to move, White cannot enter d6, e6 or f6, because the black king on e7 attacks all three squares. White has lost the opposition and the position is a draw with correct play.
- If Black is to move, Black must give up the opposition. Suppose Black plays Kd7.
- White steps to f6, a key square for a pawn on e4. The white king now stands ahead of the pawn and on the sixth rank.
- Black cannot chase the pawn and the king at once. If Black plays Kd6, White plays e5+ and the black king must leave, so the pawn advances with the king beside it.
- White brings the pawn forward with the king supporting it from in front or beside it, then promotes.
- Before each pawn move, check that the move does not leave the defending king with no legal move while not in check, which would be stalemate.
The lesson is that nobody moves a pawn first. The king goes ahead, the opposition forces the enemy king aside, and only then does the pawn advance.
Common Scenarios
The race to a passed pawn
Both sides have a pawn that nothing can stop. Count the moves each needs, and also whether the first new queen gives check. Winning the race by one tempo can be the difference between a win and a loss.
A rook pawn on the h-file
The attacking king needs to drive the defender away from the corner. If the defending king reaches h8 (for a white h-pawn), or can step to the corner in time, the game is drawn, because the attacker can only force stalemate or a repeated shuffle.
A distant opposition
When kings stand on the same file with three squares between them, the same idea applies at a distance. The player who does not have to move holds the distant opposition and can often take the direct opposition next.
Triangulation
Sometimes the position is right but the wrong player is to move. A king can lose a move by travelling around three squares in a small triangle to reach the same position with the other side to move. It needs enough free squares, so look for it when a simple waiting move is not available.
Mistakes to Avoid
- Pushing the pawn too early. A pawn that advances without its king can be attacked, and it gives up squares the king needed.
- Moving the king behind the pawn. From behind, the king cannot take key squares, so the pawn becomes a target.
- Forgetting the rook pawn exception. A win in the middle of the board may be only a draw on the edge.
- Walking into stalemate. If the defender has no legal move and is not in check, the game is drawn, even if you have a queen.
- Giving the opposition away by moving the king carelessly. Count squares between the kings before every king move.
Quick Troubleshooting
| Symptom | Likely cause | What to try |
|---|---|---|
| Won position ends in a draw | Stalemate or rook pawn edge case | Check legal moves for the defender before every move |
| Pawn is caught by the king | Rule of the square misjudged | Count moves, and consider whose turn it is |
| Cannot make progress with king ahead of pawn | Opposition belongs to the opponent | Make a waiting move or try triangulation |
| Both sides promote and the position is unclear | Race calculated only to the queen | Look one more move for checks and captures |
Glossary
- Passed pawn: a pawn with no enemy pawns blocking or guarding its path to promotion.
- Promotion: advancing a pawn to the last rank and exchanging it for a queen, rook, bishop or knight.
- Opposition: kings facing each other with an odd number of empty squares between them and the other side to move.
- Key square: a square which, once reached by the attacking king, guarantees the pawn can promote.
- Tempo: one move, often used for who is to move.
- Stalemate: a draw where the side to move has no legal move and is not in check.
- Zugzwang: a position where having to move is a disadvantage.
FAQ
Why are rook pawns different?
The edge limits the attacker’s king. A defender who reaches the corner square can draw.
What is a good first practice?
Set up king and pawn against king positions and play both sides.
How can I remember the key squares?
Think of them as a small group of three squares in front of the pawn, one file to each side. If your king occupies one of them with the pawn behind it, the pawn is on its way to promotion.
What is the difference between opposition and zugzwang?
Opposition is a particular setup of the two kings. Zugzwang is the wider idea that a player would be better off passing but must move. Opposition is the most common way zugzwang appears in king and pawn endings.
Is it better to push the pawn or bring the king?
Bring the king first in most cases. The king protects the pawn, controls squares ahead of it and takes away squares from the defender.
The Short Version
Count with the rule of the square, fight for opposition, and march your king to a key square ahead of the pawn. Beware stalemate and rook pawns.