I have to agree with niicegiirii.
Since Joking, Renjuplayer, Blade and niicegiirll all signed into my tournament at practically the same time I decided to look into their games to see if the claims of cheating were true.
I found the following:
1) They all have played each other making moves within less than a minute after the other.
2) They all really do usually log out within a minute.
3) And the games :)...playing oneself must be boring because some of the games really suck: In their game ending 24.12 with his almost 2700 rating Joking (playing as white) gave a surewin position to Blade VERY early in the game and Blade (with 2600+ rating also) responded by resigning :). Enough said. There are also many other unexplainably stupid moves made in other games played between those 4.
I have removed Renjuplayer, niicegiirll and Blade2004 from my tournament. Joking can play and defend his Number 1 status :). No account established after 24.12 will be allowed in the tournament, if I am not sure of who they are. Playing oneself is quite harmless (although rather funny and pointless) but entering the same tournament with at least 4 userIDs is pretty heavy cheating.