IMPs
OK, so, over 2♣ we play systems on, and partner bid 2♦ which was Alerted (not asked), and I bid 3♥ which was also alerted and not asked about. Now that I was fully shaped out, our methods were that partner could bid 4♦ asking me to bid 4♥ and telling me he is about to sign off. 4♥ was effectively Keycard in clubs (with some modifications). 4♠ would have effectively been ♦ RKC, etc.
After the 4♥ call, my RHO put a pass on the table, and I began to count out my response (the 5♣ call). Before I had even made a move toward the bidding box, partner realizes they have pulled the wrong card. They meant to bid 4♦ to sign off in 4♥. First of all, what would you rule there? Would you allow the change?
So the director ruled that the 4♥ bid remains, and clearly I now have some UI -- I responded as I would have to club keycard. My 5♣ call basically showed 2 keycards and the trump queen. Now my LHO doubles...
Partner's pass is in theory a relay beginning a spiral scan. Redouble would have been business. This means that partner couldn't be bidding keycard in clubs, otherwise they would have redoubled for sure. Therefore it now seems like AI that partner has messed up someplace. My correct spiral scan response was 5♠, but I thought I could justify based on bridge logic that partner must have done something wrong, and therefore I now bid 5♦, showing 0 or 2 top diamond honours. Seeing that they couldn't get to 5♥ now, partner passed before the doubling started. The end result was down 6, and -300 for us. Do you believe that I have AI? Just how much AI do I have -- Am I authorized to know partner probably has hearts to some degree, and could I lie and bid 5♥ instead (1 or 3 top diamond honours and 0 or 2 top club honours)?
Anyway, it is 1:30AM here, so if I forgot anything I'll fill it in in the morning.
P.S. No, partner didn't forget that 2♦ was a GF relay, they just decided to do it very light.

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