Well, he doesn't have to make a decision about quitting chess right now--that can wait till next year (and of course, need not be permanent, as he could re-join the team). We mainly just decided not to suggest playing, bring it up, offer computer/phone chess, etc. And when we did that, he stopped playing. He still plays a lot of other games. Interestingly, he did watch my DH play chess on his phone the other day and "coached" him (very effectively, I might add) but then as soon as the game was over, he walked away. I would also add that I noticed he was consistently beating a new level in his chess app when he quit playing.
DS IS a perfectionist, in ways that DD isn't (she has the occasional tendency, but DS is a different animal).
