MP, robot tourney, best hand South
I may be resulting here, and happy to be told so, but still smarting from having bid the only making game, then to be removed from it by CHO in the process of breaking a cardinal rule that we are taught as beginners; that having pre-empted you thereafter forever hold your peace. When we get more experience we learn that there are exceptions, but you need to have something pretty special, and this ain't it.
North's actions having opened 3S should be more rule-based than sim-based. It is too difficult for North to second-guess on what hand South might have bid 3N. And indeed the meaning ascribed to South's 3N is rather absurd. The description should simply read "thinks he can make 9 in NT opposite a pre-empt".
This may be one hand where I would have done better partnering a basic bot.

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.