Could someone please explain to me how the timers work? I see 2 different move timers: a 2 minute timer beside each player name, and a 15 sec. timer at the top. Sometimes the 2 minute timers are in play; at other times it's the 15 sec. timer, and there doesn't seem to be any consistency in when they come into play. Very frustrating. One minute I have 2 min. to make a move, then a while later only 15 seconds. I can't find anything in the rules to explain the difference.