skywood 请进！I'm quite interested in what's going on. So can you post your and your parterner's hand ?(if u can remember.)and can u tell what's the bidding going on? Actually 4NT is non-passable(for Blackwood ),But if the bidding goes like:1NT-p-4NT-p,then I think can pass.(if I'm not wrong,it's invating to 6NT). Trust ur partner ,it's very very important in bridge. P.S: I heard on that day many hands were vey very strange,It's just for training. :P