Compulsory

Mandatory, as in a Compulsory Capture Rule, where a player is obligated to capture an opposing counter. Compulsory capture is a rule in many variations of Checkers/Draughts, although it may not be used in informal play. Adding or removing a compulsory capture rule to a game can have a dramatic effect and even creates a dramatically different game in some instances. Compulsory moves affecting a player's game is considered a related concept, called zugzwang. Zugzwang can be described as being at a position such that being forced to make a compulsory capture can place a player at a distinct disadvantage, and could even cost the player the game.