mycroft, on 2024-December-16, 18:07, said:
per Kickback, most of the problems I've seen have been not in diamonds, but in hearts (which I know isn't "red"wood).
4♠ -1 with 6♥ on, or 5♥-1 with 4♠ making (and intended), or 4♥= with 4♠+1 but "can't be bid" (but of course it could and would, at least partner will *say so* after). Yes, it's a useful tool, and allows for ace-asking in many situations normal KC players will have to either guess or hope; but my partners aren't inured to "oopsies" in slam auctions, and will remember the one mistake to the 5 wins (and the 30 didn't matters). And so will I. And again, it's worth putting the effort of "disambiguating auctions" into the 10 competitive auctions we get a session rather than the maybe 0-2 keycard auctions, even if 90+% of *those* are unambiguous to the kibitzer over there at the poker table.
Quote you 100% there. And in one of those bewildering short-circuits between forum discussion and bridge at the table, yesterday I had a misunderstanding in a diamonds auction because partner took my 4♥ control bid as Kickback and started to respond RKCB Luckily I was sitting on 21 HCP as responder (it's Christmas) and so was able to shut him up with 7♦, to the surprise of the table. Which somehow turned out to be a top all the same, even though 7NT was cold. Not good for partnership confidence though, even when you escape real damage.