Endgames
Opposition
In direct opposition, the kings face each other on the same rank or file with exactly one empty square between them. The side not to move has the opposition and can often force the other king to give way. Pawns, key squares and spare tempi determine whether this wins.
A practical example
The white king is on e4 and the black king on e6, with Black to move. White has direct opposition. Black cannot move to e5 and must choose another square. Without pawns, the position is still drawn.
A common mistake
Treating opposition as an automatic win or overlooking a pawn move. A reserve tempo can change who must give way. Reaching a key square may matter more than opposition itself.
Try this in your next review
Place the kings one square apart and change the side to move. Then add a pawn and investigate which king moves actually enable promotion.
