Doubled paws are two pawns of the same color on the same file. Here’s an example:
In this position, white as doubled pawns on the
F file (on
black has doubled paws on the
B file (on
b6). Doubled pawns are
often a weakness because:
f3for white and
b6for black) are easy targets, especially because a rook can’t defend them since there’s another pawn before them.
On the other hand, especially in the opening and in the middlegame phases of the game doubled pawns can create the advantage of an open file for the possessor of doubled pawns.