Danny Kleinman will address this dispute in the next issue of Chicago
Point:
#2. White had just brought her last checker in with a 6-1 playing 13/6.
Black (on the bar against a closed board) obviously cant roll. White
paused for only about three seconds prior to rerolling her dice. When
the roll came up 6-1 again, Black protested. "You didnt give me the
chance to double. I demand that you reroll."
We can assume that the 6-1 was a poor shot that entered behind a 5 prime
and that the 6 hurt White's timing and that White is on the verge of
breaking unless a quick 6-1 comes up.
Black should be alert enough to tell White not to roll, and this should
happen before White rolls. However, White shouldn't take advantage and
scoop his dice instantly and shake once and dump them out ASAP.
If you are on the bar against a closed board and need to double, you
have to speak up when the opponent is getting ready to roll again. There
is no requirement for the roller to wait for any particular amount of
time.