jdeegan, on 2013-August-31, 14:08, said:

1. Very distinct possibility of a diamond void in partners hand
2. Spade cue bid allows me to locate specifically the club ace
3. A grand is still a possibility, though somewhat remote
4. Spade king is as good as the ace of clubs
5. Disaster hands like:
♠KQx
♥QJ10xxxx
♦A
♣J10
are low probability, and not, imo, worth worrying about.
1) He can show the diamond void as part of his RKC response.
2) The ace of clubs is a key card. Are you saying that you wouldn't want to be in 6
♥ without the ace of clubs even if he had the others?
3) Can't we bid grands after key carding?
4) That is certainly not true. With the ace of clubs we may well have no black suit losers (if he has at least 3 clubs and no more than 2 additional low black cards to ruff). With no ace of clubs and the king of spades we definitely have a black suit loser. This also seems to be a non-sequitur, if partner cue bids 5
♦ over your spade cue bid, how will you know if he has the K of spades or not?
5) Unlikely? Sure. So on what hand will cue bidding work, where key card fails?