I was lucky

Here is a position  from a recent game, 2196638. My opponent played M11 which I believe loses. It looks to me like there is a unique winning move for black here. This should be super easy for the strong players. Please tell me I'm correct.

M12?

I think David is white in fact and M11 played by Black is the black circle.

Sorry I mean that my guess is that M12 is the winning move for Black (instead of the M11 shown), although I haven't checked thoroughly

Heh okay so after black M12 white J14... ?

Does black N9 work?

Well, that's not the move I was expecting.  Instead of N9 in that sequence, black L12 looked simpler. But that doesn't mean you are wrong. I am posting another diagram to continue this N9 variation, but I wonder, am I missing some feature of minortriad that would make this process simpler? I know trmph is back and I could always post a long url, but I have kind of forgotten how to do that, exactly. By way of comparison, the Twixt analysis page allows public discussion of completed games, using text comments with moves that can be clicked on to produce any variation you like. Maybe I'm spoiled.

So, after black M12 J14 N9 L13 M13 L12

White has connected H9 to either H11 or K10 (which are now connected to each other,) and threatens to start a ladder with M8, so black blocks it. M7 M11 O10 N14 N11 L15

How can black win here?

I should clarify: I don't think black can win in that line. But maybe I'm wrong, so I am asking.

Hmm I believe after L12 Black can play K12, right?

Also I believe ...M12 J14 L12 loses to K13

Yes, thank you, so black N9 or L12 both seem to work against white J14.

Hmm, but for L12 whats the reply to K13? Black pretty much has to block at M7, after which White can play M13:

To be clear the full line is ... M12 J14 L12 K13 M7 M13

Yes. of course you are correct. Thanks again.

Thanks to David for the game and to everyone for the analysis.

David wondered whether minortriad.com could perhaps generate complete board images by coding the moves in a URL (as is possible with trmph).  It doesn't, at least not yet.  It would be a reasonable service for me to add but I'm finishing up some other stuff first.