a lot of text but there is a lot to consider because of this hidden move.
There are too many points he could have played to make a scan useful
So I have to rely on visible moves in the future to get more info, before I use my scan (If I use it at all).
I thought about using my own hidden move, but discarded it soon. I want to keep it to allow a comeback if I get trashed by his (hidden) move.
As long as I have my hidden move I can make a comeback from an impossible position. He has used his move so he can't.
I do want to look at the possibilities and base my next move on that.
(later I can look back here to see if I can eliminate some possibilities.)
Another interesting thing is that he did not want to update his score. This could very wel indicate he played a plus or minus point.
Either of which would be revealed by him adding it to the score. I will therefore consider every plus and minus point to be a potential hidden move.
The plus point on the left looks silly so that's probably not it, same for the one on the bottom (both are too passive)
The one on the top is possible. It has some options in the corner and can connect at the top, still it looks to small to be worth a hidden move.
Both the minus points are worth it, because black has a big point lead and either of those points can cause big damage. A minus point is also something he will think I might not expect (some kind of reverse psychology or something
)
a or b would be devastating, killing my right side group.
I just stabilized the right side. If he wanted to kill me there he would have used his hidden move there during the fight.
Also he will probably expect me to scan there or play an extra move there because it's the only obvious place that can directly kill my whole group.
So I'm going to assume he did not play a or b (reverse psychology thing again)
If I'm wrong I die there, but can maybe resurrect it later with my own hidden move.
c looks big, but is probably too small for the hidden move.
Any attachment to any of my base stones on the left tooks like the most likely option for him. (if he captures one I lose 5 points)
On the top I have more stones than on the bottom, so he can do most damage on the bottom.
If his move does happen to be on the top, I have more support there to get out of the bad situation.
I guess I'm going to reinforce the bottom left, and wait and see what he plays and try to get more solid info on his hidden move.
The minus point at the bottom left seems like a really nice place for a hidden move. It would be where I played it if I was black.
It is something "unexpected" that has a huge impact on the board if I missed it.
I would lose the whole bottom left corner and have to watch out not to lose my base stone.
so u,v,w,x,y,z, and both m points are most likely.
with the bottom m being the most likely, in decreasing order followed by:
z, w, y, top m point, v, x
the move I played kid of protects against the two most likely options.
It is a bit slow but still not a bad move if there was no hidden move.
(I can not start to play too soft now.)
any followup's on the left will quickly indicate where his hidden move can most likely be found.
I do have to watch out for him making a power play, and bluffing by playing something at the top that makes me expect his hidden move to be there and make me respond with care allowing him to get a good result at the top, only to find out later that his hidden move actually is on the bottom.
I think the biggest gain from this is that he spend his move and get to keep it. while I hvae to worry a lot now, I can make him worry any time I want to
$$Bcm1 Score - B: 36, W: 23
$$ +-----------------------+
$$ | . . . . . p . . . . . |
$$ | . . . . . . O X O X . |
$$ | . . m . O c O X X . X |
$$ | . w @ . . X X O O X . |
$$ | . . v . . X . X . . . |
$$ | p . x @ . . X O O . X |
$$ | . . y . . . . B O a O |
$$ | . z @ . . . B X X O b |
$$ | . . m . . B . . O . . |
$$ | . . . . . . . . . O . |
$$ | . . . . . p . . . . . |
$$ +-----------------------+
- Click Here To Show Diagram Code
[go]$$Bcm1 Score - B: 36, W: 23
$$ +-----------------------+
$$ | . . . . . p . . . . . |
$$ | . . . . . . O X O X . |
$$ | . . m . O c O X X . X |
$$ | . w @ . . X X O O X . |
$$ | . . v . . X . X . . . |
$$ | p . x @ . . X O O . X |
$$ | . . y . . . . B O a O |
$$ | . z @ . . . B X X O b |
$$ | . . m . . B . . O . . |
$$ | . . . . . . . . . O . |
$$ | . . . . . p . . . . . |
$$ +-----------------------+[/go]
*edit:
the bottom plus point is now huge for me. I'm going to take it as soon as possible.
** edit playing at z would be better. it eliminates one option and protects against both y and the bottom m.
However I think it would be too passive. If I play that way, I'm already giving in too much, just because of being afraid.
, but I'm not giving up yet.
@ 
allows me to connect underneath in sente.