Managed to sort out two groups after lots of clicking and scored 6. Might have been 10 if it weren't for the multiple solutions. Pontoon/bridge, whist/bridge and tango/waltz are all interchangeable.

10/10. Fan of the Wade line. Straightforward and solid

1Star = as stated below not a valid grid. A shamebecUse othi g wrong with the ideas, especially Charles

A fine grid which would have been more enjoyable if the issue raised by Orlando had been fixed. To describe the grid as not valid feels unnecessarily mean-spirited, however. Some constructive criticism would be far more useful to help improve future grids. Overall, a nice attempt. Thanks!

Interchangeable answers Orlando, that's the whole point of it i thought

@Bob it's common for a single item to fit into multiple groups, yes, but there must be only one possible way to split all 16 items into four groups.

Right, JonBob. That's just about the only rule there is for this puzzle format, which would be pointless without it. And mean Mister Tom should know that the PC term "solutionally challenged" is more acceptable these days.
I notice, by the way that this grid is maintaining a four-star rating. Make what you will of that.

"Solutionally challenged" LOL. Apologies if bluntness offends: I do try to give constructive criticism, but not sure what one can say here beyond "check through to make sure you don't do that again". 4stars sufggests most people liked it anyway (or just didnt notice).

I'd be surprised if you'd caused any offence. Why assume that setters are such sensitive souls? I thought Lebamski's "mean-spirited" was rather harsh. Hence the tongue-in-cheek comment below.

@Orlando and @Mister Tom: Apologies if my reply came across as harsh, it wasn't intended in that way. In all honesty, my comment was driven by the fact that there are so many corners of the internet where people take pleasure in throwing insults and snooty comments at each other, and I would hate it if this site went in that direction. I don't think it is at the moment, but I much prefer to leave positive feedback about a grid (which is possible for most of them) than comment on why I think it fails. Anyway, let's keep the great quizzing going! :-)

@Lebamski: In my experience (cryptic crossword blogs), sites like this one tend to be insult-free and well mannered although an element of snootiness does creep in. But as you're moderating anyway, could you please do something about faint praise. Comments like "nice try though" can be intensely annoying. Viva el quizzing!

@Orlando: I take your point on the faint praise - never intended to be read like that, but I can see how it might grate. I'll aim to avoid phrases like that in future :-)