I am in this tournament: http://online-go.com/tournament/2629
Its timing is listed as ‘3d + 3x1d’. But it looks like now that we have passed through the first 3d period, every move resets the player’s clock to 24h + 2x1d.
This seems very odd.
3x1d is three times 24 hours. So after main time you now have 24hours + 2x1d left. After first period has expired you will have 24h + 1d after that you will only see 24h and if that runs out you will timeout.
That’s what it’s supposed to do 
The problem is it appears to be doing something else: every time either of us makes a move, our current period seems to reset to 24 hours.
That’s how the byo-yomi clock works 
http://en.wikipedia.org/wiki/Byoyomi
You have X initial time, when that runs out you start using your byo yomi periods. As long as you move within a byo-yomi period the period time resets for your next move. If you go over, your byo-yomi period count goes down by one, and you enter the next byo-yomi period. If you run out of byo-yomi periods you lose on time.
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Aha! Thank you… I think the thing that was confusing me was that there were three of them (in reality, three chances to go over byo-yomi time before forefeiting).
Cool.