When you pick up a very distributional hand, you expect a difficult, competitive auction. This shapely hand occurred at Eastern Shore BC recently.
Perhaps you should consider what North should do before reading on. North’s opening bid is clear; with 7- 5 shape there is no attraction in starting with 1H. West’s 2NT bid showed spade support in a goodish hand. With 7- 5, it must certainly be right for North to bid 3H or 4H at this point. Note that the extra playing strength comes from the long heart cards and not from the void which takes no tricks that were not already present as long trumps.
South clearly has a weak hand with diamond support but not enough to bid 2D on the first round. Can NS make 6D? It seems we will lose one spade and, at least, one heart. Can they make 5S? There must be a good chance that we don’t have a defensive diamond trick so it seems they will make 5S. It seems that we should sacrifice in 6D expecting to go one or two off but there is a nagging worry that they might feel forced to bid 6S which will make if one of them has a diamond void.
Now, at last, an epiphany! South is going to lead a diamond unless we can divert her attention to clubs and then we can look forward to a club ruff at trick one and cashing the AH at trick 2. The correct bid at this point is obvious when you think of it. Bid 6C which must be a lead directing effort since we have agreed diamonds. After this, we can sacrifice in 6D without worrying about 6S making.
The opponents duly doubled South’s correction to 6D and it was easy to play for one off.
If you didn’t like West’s 2NT bid, neither did I! A splinter bid of 4D seems clearly correct showing the diamond shortage and mild interest in going beyond game.