if a game reach a situation that it cannot be won , declare draw.
Some players use the following tactic to get a perfect Score. they create a two player game with points above recomendation. then if the game reach a state that it cannot be won they ignore request to disable karma. they will pretent to leave the game just to come back to see if the other player left. if so they will wait till the 200seconds are over to get the win. or they will stay until the other player gets tired waiting their response.
Other then a dishonest game play this also waste system resources as the game continues to be avtive cards are accumulated then with 7 gets discarded and again until the game is over.