Cascade, on 2023-November-17, 15:15, said:
You can probably do a better experiment by generating hands with QJ only and forcing GIB to defend on some reasonably straight forward auctions like 1NT 3NT and 1♠ 3♠ 4♠ etc and observing what GIB does on a much bigger data set.
Well, I just dealt a couple of hundred different random hands with an advanced robot and those conditions at a teaching table, and fourth seat now played the J on 100% of the hands, without a single queen, which is the opposite result to 2020, but equally bad. Something is definitely messed up one way or the other.