If under set conditions the allotted time is exceeded by a player, then this causes his immediate loss and ends the game. Forfeit A misbehaving player violating rules or human conventions forfeits a game. This means his loss and the game end. In tournaments it is the task of referees respectively tournament directors to judge in such cases. Suspension Suspension is a game end without result and due to extraordinary circumstances or based on some tradition.
Natural forces are one example.
In Japan the higher ranked player was traditionally considered to have the right of suspension at any time. All board positions at a game end are called terminal. In a strict mathematical sense a more restrictive view is possible. Game theory is interested in positions allowing clear decompositions of the grid as to scoring and unalterable scores. In practice some rule sets allow scoring for any position, others have a strong desire to score only certain classes of positions.