Some boardgames, like Chess or Go, use an adjournment mechanism to suspend the game in progress so it can be continued at another time, typically the following day. The rationale is that games often extend in duration beyond what is reasonable for a single session of play. As in Chess, there is sometimes a sealed move, where the next move that would be made is sealed in an envelope, to be played out (usually by an independent third party).
Schedules allowing for adjournment usually fall into either of two categories:
The rules for adjourning a game are as follows:
The first three rules are designed to encourage players to continue games until the end of the session, but no longer. The last rule, while seemingly bizarre, is the only way to adjourn a game fairly: the alternative of suspending a game in a position known to both players gives a big advantage to the player who has the move upon resumption, since they get to choose the best continuation after a thorough analysis. As such, the rule ensures that neither player knows upon adjournment what the position will be when it is next their turn to move. However it is generally considered advantageous to be the player to make the sealed move; especially if the move forces a specific response from the other player. Considerations on when to adjourn a game can be complex, and often involve an extra dimension of psychology that is not part of the strictly logical struggle on the board. Analysis of adjourned positions is an art in itself.
With the advent of strong chess playing computer programs, which could be used to analyze an adjourned positions, most tournaments have abandoned adjourning games in favor of shorter time controls. The first World Chess Championship not to use adjournments was the Classical World Chess Championship 1995, while the last one to use adjournments was the FIDE World Chess Championship 1996.
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