1H P 2S An opponent requests an explanation. Ah! We haven't agreed anything. Traditionally the jump shift is 16+ HCP, forcing to game at least, but this treatment is no longer universal. I have opened a can of worms and then jumped into it. I vote for "no agreement". At least that is the truth. (This did not happen.) 1H P 2H P 2S An opponent requests an explanation. We haven't agreed anything here, but the response should be the same. The opponent demands to know what the 2S bidder means by the bid, irrespective of whether or not we have an agreement. BBO rules are crystal clear. You are not obliged to explain what you intend any particular bid to mean. You do have to explain your agreements. (This did happen.) In the main, BBO members use the rules sensibly. For example a 4NT bid with a parallel chat "3041" or a 4C bid accompanied by a "splinter". Nobody objects to that. However disclosure rules do not seem to be understood, even by advanced and experts.