How do you deal with sore losers that cancel the games when they are on the losing end?
it just sucks.
can they be reported and penalised?

Yes I agree. Should be able to mark them down. It's happening more and more. 

Name and shame!

How about marking avarages down for cancelled games? People will do it to protect their average.

same thing happened to me just recently on my first game on this site. i thought perhaps entered my score incorrectly, which btw i still am very unsure about, but i dont think that was the case at all cause the guy, lunar something sounded pretty pissed in a different language

i made my oun list 

Inform the administrator 

I dont get what is the point to cancel a game? To save the avarage? Boy, there are good and bad days, everyone knows that. The only one they are cheating are themselfs.

I just hate it...They do it to protect their average... Sore loosing...its pathetic... Every one have bad days...but now eventualy you get a good winning game even with low average and the opponent cancel... If my average goes down so be it...ill get it up again...its my motivation to do so... Its my time and effort i put in to enjoy the game... unexeptable !!! Also the guys put no true darts used with a close... Why I ask? Be true to urself lol

Ór give us the option to block a player please ?

I black list them with the tamper monkey addons