1
♥ - 2
♦ 2
♦ automatic, 2/1 GF
2
♥ - 3
♠ 2
♥
4
♦ - 4NT 3S = splinter, no club control
5
♠ - 6
♣
6
♥ - 7
♥
Pass
3S is splinter, denies club control the way I play this (well known view I have on this, see these two links for instance
no splinter becuase of ace if off suit or
http://forums.bridgebase.com/index.php?sho...control++third# )
4D is cue-bid (here some might argue last train, but I must have club control at very least not to sign off, so more important to show diamond fitting with partner, than club control. The fact that I cue-bid at all shows club control, QED.
4NT = rkcb
5S = two plus queen
6C = asking bid in clubs, maybe opener has club AK (see kantar RKB) for 7NT
6H = no King or Queen of clubs
7H = missed clever 7NT, because I think I can ruff a spade, your sixth heart makes up for lack of spade ruff...
If opener decides to show his clubs (not unreasonable) instead of rebid hearts
1
♥ - 2
♦
3
♣ - 3
♥ (set trumps)
3
♠ - 3NT (3S = cue bid, serious 3NT)
4
♣ - 4NT (4
♣ = cuebid, 4NT = RKCB, 5
♠ two plus queen)
5
♠ - 5NT (5NT is asking bid)
7
♥ Pass
Once again, kantar RKBC stuff. 4NT blackwood, 5S two with queen, 5NT now grand slam try, his specific king ask. In theory, opener bids kings up the line. But as kantar says if opener can count 13 tricks he bids game. Partner doesn't know about the diamond Queen nor the extra trump, so the grand is at least a reaspable shot. Note, this way, grand is reached if opener has
S-x H-AQxxx D-xx C-AKxxx or the current hand with fitting diamond queen and extra trump. If responder was just interested in diamond Q he could bid 6D Specific suit askng bid, bidding grand if opener shows Queen, but this risk getting to 7H when partner has same hand with singleton diamond.