When he starts talking announce to him that if he continues you will refuse to play. Just walk away. Perhaps others will follow your lead. Report him to the team captain and the league admin.
Opponent talking during otb game
Sort:
So what happened ?
This isn't street craps we are playing here, its Chess! Don't talk to me while we are playing, don't even look at me, in fact, don't ever look at me!
.