VS How Should We Select Trump For RKC In High Level Bidding Situations

Lets assume, that we arrive to a 3NT bid from opener after the following bidding: 1♣-1-1♠-2-3NT. If 2 was a game invitational or better convention, and to that 3NT showed extra value from the opener, now responder has only 2 free positions to go to slam in forcing way, but we need them for signing 3 suits for the opener: his opening and 2nd suit, and our own suit slam forcing hand. What should we do?

My solution is, that 4 should be RKC in opener's suit, not considering, that it was 1♣ or 1.

If we do so, our 4♣ bid can ask 4 relay, and to that we can ask RKC in both major suits.

 

 

1♣ 1
1♠ 2
3NT ?
4♣RKC in either  or ♠, to that 4 is obligatory, to that 4is RKC in , 4♠ is RKC in ♠
4RKC in opener's minor, now in ♣
4slam invit in , otherwise we bid 4 to 1♠ with GF monocolor in 
4♠slam invit in ♠, otherwise we bid 4♠ to 1♠ with GF ♠ support
4NTquantitative slam invit, passable
1 1
1♠ 2♣
3NT ?
4♣RKC in either  or ♠, to that 4 is obligatory, to that 4is RKC in , 4♠ is RKC in ♠
4RKC in opener's minor, now in 
4slam invit in , otherwise we bid 4 to 1♠ with GF monocolor in 
4♠slam invit in ♠, otherwise we bid 4♠ to 1♠ with GF ♠ support
4NTquantitative slam invit, passable

 

Thos solution is also useful in parallel situations.