A deal from the US Open Trials yesterday. Since we still can't get access to the vugraph archives, I can't give you the spot cards, but they are irrelevant anyway.
Your partner opens a natural 1♣, RHO overcalls 2♥ (natural, weak), you bid 3♦ and lefty makes some noise with 3♥. Next comes 4NT by partner, RKC for diamonds.
5♠ by you (two KC's and ♦Q). Now 5NT from partner, grand slam try. Perhaps you think you have enough to bid the grand slam now, but you decide to bid 6♥ instead. The tray comes back to you with 6NT.
What do you do now? Pass or 7♦?
Roland

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.