Running from a match could be sanctioned as wullie says.
Running from the entire tournament, 5-20 minutes before as some familiar types do, could be sanctioned by deducting points from their overall tournament points. For example, a player with 40 points who stops / runs out of the tournament with 15 minutes remaining will lose 1 point x minute = 15 points. At the very end he will stand with 25 points! 

Yeah if they quit they should lose the match unless there are not enough rocks left for you to win. I’ve also been 3-0 down & tied or won the match. It seems an unfair way & I’m sure they could do something to change it but I suspect that they won’t.

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Hi Pebbles, it happens all the time & no action will be taken. He must’ve been far enough ahead in the match or it would’ve been awarded to you. I’ve been 3-0 down & the player quits & gets awarded the match, it annoys me cos I think that I might’ve made a comeback. Cheating I dunno but bad sportsmanship most certainly.

Hi Pebbles

This is not cheating in the narrower sense, but shows lack of sportsmanship. Players like Go˛B`13/12/11 (very often) and svh12 (sometimes) act that way.

The system wants to be well balanced, but fails in this case. I suggest this counting: 15 for every win, 5 for every tie, 5 for every game, and setting a maximum amount of games allowed to be played. 

The moderators exist, not less, not more. I am very sure they were the inspiration for the proverb "lean on others and you'll fall". Go and 

https://cdn.ebaumsworld.com/mediaFiles/picture/258394/81773591.jpg

 , you only learn the hard way ;-) 

Credit where credit is due