Scoring: IMP
You are south in the 4th seat.
Auction proceeded P-P-1N-2♣(1)-P-2N(2)-P-3♠-P-P-P
(1) card (not looked at till after the auction) says single suited with a major, asked and explained as both majors
(2) S is not a good player and has no idea of the proprieties here, he gave the explanation of the 2N bid as it would have been had the 2♣ bid been both majors, and wasn't 100% clear what it was even then. There was a suggestion (can't imagine why) that it didn't show any values opposite the both majors version, but did show some opposite the single suited version as 2♦ was the weak hand bid. S actually said that he only bid 3S because he knew from the explanation that partner was weak, and clearly had no concept of what UI was.
At the end of the auction, S explained the mistaken information that they were playing 2C as single suited with a major.
I don't and never have played this system and neither had the director. The question is what does 2N mean (I thought it suggested he would have raised either major to 3). The pair themselves were unclear.
Our contention was that as the hand is as maximum as it can be in the 9-14 box they were playing, he should bid 4S rather than 3S. The contract of course makes 9 tricks. The hand opposite was 9x, xxx, 98xx, AKQx and the clubs were 5-1, diamonds 5-2 spades AQ double onside.
Director ruled score stood.

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