Cheating....

jamaica=vayamos=guahong=dragonplayer=Chxxxba=aaaaaaaaaaaaaaa

You should put player ids rather than names, because jamaica changes his name quite a lot.

player ids 17304=17583=17396=17305=17592

what happens to cheaters like this player?

Nothing. Seriously.

Jamaica gets 2323 by cheating, that's not fun.. admins can't block nicknames' players who cheat too much? he got too far

Admins could block players who cheat, but they decide not to. It's a big defect of this site. It's one of the reasons I stopped playing dots and boxes here.