another idea:
"calling the shot"
a rule from billiards.
for last day of submission i will submit a score of 20000-3dmarks
anybody not calling their last shot(last submission day) will not be accepted.
this must be done 5 days before last day. hence every participant will not be surprised of the sandbag.
therefore 5 days before last day, we'll have a tally of sure guys submitting a score at the last day.
just an idea from the shower lol