Definition:
An antipositional move violates or ignores the principles of positional play. For example,
- the principle of Pawn captures says 'capture toward the center' : an antipositional move would be one that captures away from the center;
- the principle of centralization says 'a Knight on the side of the board is badly placed' : an antipositional move would be one that moves a Knight to the side of the board;
- the principle of a healthy Pawn structure says 'doubled Pawns are weak' : an antipositional move would be one that voluntarily allows one's own Pawns to be doubled.
Calling a move 'antipositional' doesn't mean that it is necessarily bad. There may be very good reasons for capturing away from the center or for moving a Knight to the side of the board. A good chess player recognizes those reasons, but weighs them carefully against any obvious positional disadvantages.
