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North quite reasonably opened 1D and South responded 1H, at which time North rebid 1S.
Sin #1
South now bid 3H which is non forcing! I tell my students that with an opening hand opposite an opening hand, the partnership must get to game. In other words, responder must not make a non forcing bid below game! A second round jump in no trump or a suit previously bid by the partnership is invitational, not forcing.
North for some reason accepted the invite and bid game with her minimum 12 count and two low hearts.
Sin #2 and Sin #3
South now trotted out 4NT, Roman Keycard Blackwood, committing two sins with one bid. The first being inviting to game and then going slamming when partner accepts your invitation. Perhaps here she was trying to compensate for merely inviting game with a powerful 15 count opposite an opener – if so, the phrase “oh what a tangled web we weave when first we practice to deceive” comes to mind, as one lie causes others in a domino effect.
The conjoined sin is of course bidding RKCB with a void. When North responded showing 1 or 4 keys, South with 3 keys and a void could not tell if partner held the worthless diamond ace or the highly desirable trump king.
Conclusion
6H did not fare well on an 8 card trump fit missing the king, queen and jack. Let’s see if we can propose a sensible auction.
After 1D-1H-1S, I would bid 2C, 4th suit forcing and artificial. This immediately sets a game force and strongly implies 5 or more hearts. North without three hearts or a sure club stop would likely rebid 2D, over which South can bid 2H showing a 6 card suit. North should raise directly to 4H, “fast arrival” to deny any semblance of slam interest. That should end the auction given South’s ratty trump suit. Even if South makes a slam try (by cueing 5C, NOT by bidding RKCB), North’s 5D cue will dampen even the most fervent South’s animal spirits and she can safely sign off in 5H, which makes as the cards lie.
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