With a regular partner, one may have bidding understandings, express or implied, to which the opponents should be alerted to (e.g. partner psyches frequently, or whatever).
With an individual partner, I not infrequently find my partner is someone who was an opponent a previous round and I base my bidding and/or defense in part on my impression from that previous round. For instance, maybe we've agreed SAYC but I noted p was a timid bidder while an opponent so I jump to game instead of inviting or whatever. Maybe I noted that despite having agreed to a particular signalling method my partner messed it up in a previous round with their then-partner. Is there any obligation to alert opponents to this information I am using to affect my decisions? I can see honest reporting being deemed insulting (e.g. private chat to opponents "My p was an opponent of mine in an earlier round, and bid, and played, atrociously, so my bidding will take that into account...
Also, one sometimes finds oneself playing with a partner in an indy who is NOT a regular partner by any means, but who one has profile notes on (e.g. I might have a partner with a profile note, possibly made months prior, "NOT an expert, passed cuebid in opponent suit!"). Unfortunately that's a real example, not a hypothetical one...
During bidding and defence in an individual tournament, I will take into account such "extraneous" information. If I think my partner is a bad bidder because of their bidding while an opponent in an earlier round, or overly timid, or overly aggressive, or whatever.
I've never thought there was any ethical obligation to alert opponents to this "extra" information about one's partner in an individual -- but is there one?

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