3♣ was Bergen, showing 8-11 HCP and three card support. After a think I judged slam had a fair chance if partner was not dirt minimum, and after checking we weren't missing two key cards, bid it.
I was right we had a slam on, I just got the suit wrong. There are 11 tricks on top. 6♣ is cold because the spades provide a heart discard and a heart ruff is the 12th trick. There is no such discard available in 6♠, so after trying the desparation attempt of running all the black suit winners (which needs South to hold all the red suit honors or North to have Hx in hearts and South holding the rest of the red suit honors, and he would have opened in that case), I went one down, which gave them back the top they had given us on the previous board when they punted a slam going two off.
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Lack of ♦ duplication allows EW to make 6♣. At the table, we would bid
_P - 1♠ - 2♦(Drury) - 4♠. End
Hence, the suggested auction on the left is rather contrived but illustrates 2 Interesting ideas ..
DRURY 2♦:: When we play 2♦/♥/♠ opener =WEAK, after P - 1M - ?? we agree ...
- 2♦ = ART. Drury. .Max pass 3 + support.
- 2♣ = NAT, Would have opened 2♣=WEAK had it been available
SIX-KEY ASK when you have a double fit. Reply steps: e.g. after 4N = ASK
- 5♣=1/4,
- 5♦=0/3/6,
- 5♥=2/5,
- 5♠=2/5+Q.,
- 5N =2/5 + 2Qs.
With the black suits agreed, after say 4N - 5♣(1/4) - 5♦(Key Q?) -
- 5♥ = 1 Key Q + ♥K (improvising in as natural a way as possible)
- 5♠ = No key Q.
- 5N = 1 Key Q.
- 6♣ = 2 Key Qs: ♠Q + ♣Q.