According to FIDE rules, the DGT 2010 and XL clocks always show the total amount of time left for the player. This means it shows the main thinking time and the delay time added in the display.
As soon as a player switches the lever of the clock the following will happen:
- The player used less time for his move than the delay time: The clock will jump back to the value it had at the beginning of the player's turn, no main time has been used
- The player used more time for his move than the delay time: The clock will add the delay time to the remaining thinking time for the next move
Example:
Option 14 on a XL or option 22 on a 2010: Delay Blitz, 5 min + 3 sec per move free.
When choosing this option the display will show 5.03 (5 min, 3 sec)
Because the delay time is added for the first move too.
Player A uses 2 sec for the first move; the clock counts down to 5.01 and will jump back to 5.03 after the player has finished his move.
Player B uses 5 sec for the first move; the clock will count down to 4.58 and will jump to 5.01 (4.58 + 3 sec) after the player has finished his move.
When the clock shows times beyond 20 minutes, you will not see the seconds. This means than you will not be directly informed about the delay time, but it will be active if you chose a delay option.
In the US this method is called "Bronstein" but in principal it is the same as when the clock would wait counting down during the delay time.
A clock with the functionality of a DGT 2010 which has real Delay options is called the DGT North American and is only available in the US.
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