We simply bid 1N(12-14)-2♥-2♠-4♠ and went off when the spades were 4-1. The entire room was in 4♠-1 with 3N cold.
On this one with 5♦ cold and 6 actually making with ♦Qx onside, the most common result was a diamond partial.
We bid:
1♦-2♦(inverted 9+ with 5 or 10+ with 4, not denying 4M)
2♠(nat, 4)-3♦(minimum NF)
P
S visualised something like xxx, Kxx, AKxx, xxx where you're not even safe at the 4 level, and N visualised AQJx, Qx, Qxxxx, Qx. N has the additional problem that it's not clear what he should bid over 2♠ as 3♠ would show 4, he has no club or heart stop to show, and is not sure he wants to commit to 4♦. Of course spades are 3-3 so 12 tricks are available there too, but I suspect our one declarer that played in spades pitched on the second heart so made 11.
Cyberyeti writes "Two hands appeared in our local league that almost nobody in the room (6 tables) managed to get right.
Should we do better on either?4♠ went off when the spades were 4-1.
The entire room was in 4♠-1 with 3N cold."
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IMO, CyberYeti's auction seems reasonable.
Bidding isn't an exact science.