(3S)-Dbl-(pass)---
3NT trough 4H = To play
4S = Transfer to clubs, may be slam try with both minors
4NT = Transfer to diamonds, may be both minors choice of games or pick a minor slam
5m = Non-forcing slam try with the minor and hearts
5H = Natural non-forcing slam try
5S = Grand slam interest with hearts as trumps
5NT = Three-suited pick a slam
Higher = To play
After the minor transfer, doubler bids the minor if he would accept a slam try in that suit, otherwise bids the step between. Then:
Pass/5m = To play
5D = Non-forcing slam try, both minors (when having transferred to clubs)
5H = Forcing with hearts and the minor (pick a slam)
5S = Grand slam try without first control in spades
5N = Grand slam try with first control in spades
6C = Pick a slam, both minors (after having transferred to diamonds)
6m = To play
This offer us to show many types of hands. The biggest problem is probably when advancer bids 4H, since this is very wide range. However I see no solution unless you give up 4C as non-forcing. Another problem might be when advancer bids 4NT and doubler responds 5C (would not accept a diamond slam try) and advancer pass, because doubler might have a weak hand but would like to play diamonds and not clubs.
An improvement would probably be to use 6C as three-suited pick a slam and make 5NT a grand-slam try with hearts and first control in spades, but to me 6C sounds too natural
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