This hand came up in an inter-county teams-of-eight match against Derbyshire on 14.03.21. It was played 36 times (other county matches were playing the same boards) and no one managed to bid the laydown grand slam. This was what happened at our table, and many other tables had similar auctions. Not everyone opened the East hand 1♦. Some passed, and some opened a weak two, despite the four-card major. It looks clear to open 1♦ to me. You can raise either major if partner responds, or rebid 2♦ over a 2♣ response. I decided to show a good hand in support of diamonds, and when partner showed a minimum opener, I didn't know what to do. We could have thirteen tricks on ice, or be off two immediate club tricks. I decided to trust partner to have either the ace or queen of clubs, and bid RKCB.
Partner responded 5♥ to show two keycards without the diamond queen, which you might think is what he's got. It's what everyone responded when West asked for keycards. I think they're all wrong. First of all, just by asking for keycards, West is showing four-card diamond support. As East has six, he knows we have a ten-card fit, so the queen is unlikely to matter. Three cards will split 3-0 only 22% of the time, and a fair proportion of that the queen will be finessable after a top card has been cashed, so East can bid 5♠ to show two with the queen. He can go one better if you have the agreement in place and raise 4NT to 5NT to show two keycards and a useful void. This is all West needs to hear, and they can now jump to 7♦.
When I suggested this to my partner, he protested that he only a ten-count. But look at the assets: a solid trump suit, first-round control in a side suit, a second-round control in another, opposite a partner who's looking for slam. And since 5♥ committed the side to at least 6♦, he might as well show everything.
Responding to RKCB with a void:
Like most partnerships, we didn't have a firm agreement on how to show voids in response to RCKB, so I'm in no way blaming my partner for missing the grand slam, but for interest, this is a standard system of responses:
- With no keycards, ignore the void and make your normal response.
- With 1 or 3 keycards, jump in the void suit if it's below six of the trump suit, or jump to six of the trump suit if it isn't.
- With 2 keycards, raise the asking bid a level (i.e. bid 5NT over 4NT).
Note that partner is supposed to be able to tell if you hold 1 or 3 keycards, and only useful voids are shown, i.e. not in suits where partner has shown length.
Some pairs have an agreement to play minorwood, so that a jump to four of a bid minor agrees the suit, shows interest in slam and asks for keycards. I play this in one partnership, and I saw looking through the results that a number of other pairs do too. One problem we've been having is deciding when it is asking for keycards, and when just raising the suit. Our rather vague agreement is that it asks for keycards unless we are obviously just pre-empting or competing, but we still seem very unsure of ourselves in these auctions. These are some thoughts I had about minorwood after this start:
First of all, whatever your agreements, 1♦ - (X) - 4♦ cannot be minorwood. This bid must be a pre-emptive raise. Since 2NT is available to show a good diamond raise, the way to ask for keycards is to bid 2NT first, then 4♦ on the next round. In the same vein, no expert plays 1♠ - (P) - 4NT as RCKB for spades. To ask for keycards, they can agree spades with a game-forcing Jacoby 2NT first, and then ask for keycards on the next round, so 4NT in that auction may be Blackwood, but it doesn't agree spades.
I hadn't really thought about responding to minorwood with voids, but I suppose a similar scheme could apply. Over 4♦, responses are: 4♥ (0 or 3), 4♠ (1 or 4), 4NT (2 without the trump queen), 5♣ (2 with the trump queen), 5♦ (two with a useful void), 5♥/♠ /6♣ (1 or 3 and a void in the bid suit). I notice that this system of void-showing responses would cause headaches if you use 4NT as RKCB with a minor agreed, as I do in most partnerships. If my partner bid 4NT with diamonds agreed, I would be very nervous of responding 5♦ with the higher number of keycards. What if partner thought I had one and passed? To prevent this I'd like to make a higher bid to guarantee we'd get to slam (if partner's asking, we must belong in slam if I have four keycards), but all the higher bids have other specific meanings.
I think in this situation I'd just make my normal 5♦ response and trust partner to be able to work out from the auction so far that I can't have the lower number of keycards, but there must be some situations where it isn't clear.
One final important point on the hand, I hope you drew trumps by leading the four to the three. You won't have the chance to do that again for a long time.