Chaos: Well, people who have accounts and play at BK are deemed to have agreed to the User Agreement and to the rules of all games that are played here. My understanding is that when my opponent (or anyone else on this site) makes an illegal move (i.e. a move which is not in agreement with the rules applicable to BK games), I am fully entitled to require the management to have such a move reversed. Therefore, I think the list of “obligated players” is rather redundant since they are obligated to that effect (not to make illegal moves) already.