I was asked in a PM to explain the different time-controls. I thought I’d share my explanation of the different controls here for re-use:
simpletime controls set a per-move clock. So if you set this to 25 minutes, the clock will be reset to 25 minutes each time a player has to decide upon a move.
absolutetime controls set a per-game clock. So this is like
simpletime controls except that the clock is not reset for each move.
canadiantime controls set a per-N-number-of-moves clock. So you have a set time for, say, every 10 moves. But the clock is reset for each 10 move period.
byo-yomiis like the
absolutetime control except that once your
main timeexpires you go into byo-yomi periods. These are a fixed number of fixed length periods. If you move before a period expires then it is reset to the full period. If you let a period expire it is lost forever.
fischertime controls are a per-game
absoluteclock with a per-move increment added after each stone. So there may be a 10 minute main time with a 10 second increment. Well, because of the increment, if you move within 10 seconds your time may actually increase per-move, allowing you to dig yourself out of time-trouble.