The clock on ChessWorld acts in exactly the same way as in OTB chess. Your clock starts as soon as your opponent makes his/her move and stops when you make your own move.
Players may choose from a range of limits between 1 and 15 days per move. For each move in the game the limit chosen will be the maximum time per move. Players may choose to make their moves at any time within the limits for the particular game.
Although it is possible to make every move at the last moment before the time limit expires, it is an accepted convention on ChessWorld that this practice is avoided as far as possible. There are, of course, good reasons why a move cannot be made before the time is nearly up. For example, pressures of work or other interests, or simply the difficulty in making the best move in the particular position. However, it is considered unlikely that each and every move throughout the game will need to be at the maximum time. It is a courtesy to your opponent to make your moves as soon as you feel confident with your decision.
As soon as you exceed the time limit your opponent is entitled to claim the game by default. Of course, in many cases your opponent is likely to be quite reasonable and may be prepared to delay claiming the win for a short period of time. In Tournament games there is a limit of (2 x the time limit of the tournament) + 1 day before the game is automatically** ended by default with no player being able to claim a win. Such a game is marked T-T, (implying no result, or game abandoned), and will not appear on your records.
In the case of Knock Out Tournaments this latter rule is applied differently in all rounds up to, but not including, the final round, so as to protect the integrity of the Tournament for other players. When the checking process is invoked any games that have exceeded the T-T limits, as described above, are awarded to White or Black, as deemed appropriate, so that the next round can be paired. This special procedure may be delayed up to 35 days beyond the normal T-T limits.
A player is defined as being 'out of time' at the end of the last full day of the relevant Time Limit. For the purposes of the Time Limit, the first day starts when the board first becomes available, normally, for example, when a Tournament starts. Each successive day is measured as elapsed periods of 24 hours. After the initial move, by White, time is measured from the moment when the last move was played. For example, in a 5-day Time Limit, the time expires at the end of day 5, so that the