Opposition

Opposition

Opposition is a key concept in king-and-pawn endgames. It occurs when the two kings face each other with one square between them. The player who is not required to move is said to have the opposition because the other king must step aside, allowing the opposing king to advance or gain access to an important square. Opposition is especially important when trying to promote a pawn. An attacking king often needs to move in front of its pawn and force the defending king backwards. By gaining the opposition at the correct moment, the attacking king can make progress and help the pawn reach the promotion square. However, advancing the pawn too early may lose the opposition and allow the defender to draw. There are several forms of opposition, including direct, distant, and diagonal opposition. Here we will examine the simplest form, the Direct opposition that occurs when the kings are separated by one square. Understanding these patterns helps players calculate king movements accurately and recognise whether a pawn ending is winning, drawing, or losing.

Key Concepts

• Direct opposition happens when the kings face each other on the same rank or file with one square between them.
• The player who does not have to move has the opposition.
• Use opposition to force the enemy king to step aside and give up access to an important square.

Why This Endgame Matters

• Most endgames can get reduced to King and Pawn endgames, opposition is one of the most important concepts in King and Pawn endgames and is often the deciding factor.
• Inherent in the opposition endgames is the more advanced concept of zugzwang that is common in more advanced endgames.

Opposition

In this position it's black to move and the Kings are facing each other. If he moves his King to d5 or f5, he will allow white to pass into his part of the board. Since black will have to give up territory we say that white has the opposition. Black would prefer not to have to make a move or pass his move to white. Then black would have the opposition as it would be white's turn to move and he would have to allow black into his territory.

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Interactive Chess Board

White has the Opposition

8/8/4k3/2p3p1/2P1K1P1/8/8/8 b - - 0 1

{ It is black to move, so White has the opposition. If black moves his King, the white King will be able to penetrate the black defences and win a pawn. },1... Kd6 { Black goes to d6, leaving the square f5 unguarded. } 2. Kf5 { The white King will now capture the black pawn on g5. He will then be able to promote his pawn to a Queen. White has a winning position. } *

Opposition Not Always Enough

Owning the opposition is often particularly important in King and Pawn endgames. However is not always enough. There are cases where the player with the opposition is not able to enter the enemy camp, even if the opponent King is forced to step aside. There could be pawns that are blocking the path for the King. A draw is the likely outcome in such positions.

Interactive Chess Board

Opposition not enough

8/8/p6p/Pp2k1pP/1Pp3P1/2P1K3/8/8 w - - 0 1

{It's white's turn to move and the kings are facing each other. However the pawns are blocked and take away key squares like d4. So despite black having the opposition he can't use it to enter white's camp. The game will be drawn. }1. Kf3 {White has to move away.} Kd5 {Black can't go to the d4 square as its blocked by the white pawn.} 2. Ke3 Ke5 3. Kf3 Kd5 4. Ke3 Ke5 {The position has now been repeated 3 times, so the game is drawn.} 1/2-1/2

Common Mistakes

• Thinking opposition only works vertically, when kings can also oppose each other horizontally or diagonally.

Practice Positions

Direct Opposition

Find the winning continuation.

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Practice Positions

Outflank with the use of Opposition

Outflank the opponent to win.

8/p7/Pp2k3/1P4p1/6P1/5K2/8/8 w - - 0 1

Quiz

FAQ