The outside passed pawn is a powerful weapon in pawn endings: it sits far from the main pawn mass, so stopping it drags the enemy king to the edge of the board. Meanwhile your own king takes charge on the other wing.
Here White has the king on c3 and pawns on b3 (the outside passer) and h4; Black has the king on b5 and a pawn on h5 (the h-pawns are blocked). White to move, and the position is won (per the tablebases): the b-pawn draws the black king away and White's king collects the pawn on h5.
A rule of thumb: with an equal number of pawns, the side whose passer is further from the kings wins - it distracts the defender, and the king on the opposite edge settles the game.
Drag a piece onto the board, or click a piece and then click the squares. The cross beside the pieces sweeps every piece of that colour off the board, and a single piece can be dragged off the edge.
The pieces will be arranged into the chosen pattern.
It is the mating side to move. Find mate in one.
Openings, endgame positions and breakthrough studies - the set-up appears on the board.
It draws the enemy king a long way from the rest of the pawns. While the king chases it, yours collects the pawns on the opposite wing.
Usually not. Its job is to win tempi: the opponent has to spend king moves, and in that time you create a second passer.
It stands on the wing opposite the main pawn mass, and the enemy king cannot hold it and defend its own pawns at the same time.
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