[Swammerdam]

I just played a hand and am almost certain that N-S were communicating via side-channel. Look at their bidding:

• North barely has enough to open but jump raises partner.
  
• South has enough to bid game opposite any raise, but passes 3♠ despite partner's jump.

The N-S players were from Sweden and USA; both "Intermediate"; created 2019 and 2020. Nothing much on their Profiles.

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(My side probably makes 4♥. Should I have bid 4♥?)

[manudude03]

I wouldn't assume cheating. There is a school of thought that North should always jump raise in spades holding 4, bidding 2H if you actually have a good hand. South's decision is a bit weird, but I can see some weak players making the same decision. Cheating allegations should really be going through abuse@bridgebase.com though.

[Huibertus]

No way to know. But I'd assume they are not cheating. Usually "intermediate" is chosen by players who have been playing a significant time but have never ever learned anything about the game.

As a side note, I'd bid 4♥ with your hand first (preferably) or second round anyway.

[mw64ahw]

1♠ is 5+, 3♠ is min. The Law