Yesterday when playing something very disconcerting happened. I was dummy and partner was playing a hand. My LHO made a first discard of 9C. I wondered what this meant so looked at the opps convention card. It showed that they played standard. However as play proceeded it turned out that LHO did not have any significant clubs. After the hand I asked about the discard of the 9C and was told it was upside down. In fact opponent didn't know anything about BBO convention cards. I would prefer if, in ACBL tournaments, BBO does not post a convention card unless it is to be played with that specific partner. This would be much fairer than posting an erroneous convention card.