public shareable analyze board

Hi all,

I'm looking for the following feature:

A public shareable analyze board which allows to analyze arbitrary positions.

It should be possible to create positions in a painfree manner(particulary not in playing a game backward). 

More than two players should be able to share the board. Every player should 

be able to make multiple moves in a row. First player who wants to make the move

should get the right to make the move.

The board should be considered as the digital copy of a real physical analyze board.

 BTW, does anyone already know a platform which offers such a feature ? I'm behind a firewall so it must be web-based(I can not access special ports 5000 etc...).

How about it ?

grepschrop> "BTW, does anyone already know a platform which offers such a feature ?"

On FICS or ICC, a coach can load a position or a game via PGN and ask the student what he would do. The student can move the pieces around (say, 6.Nf3 Bg4 7.h3) and the coach can freely takeback the moves and say, "but you missed..." and play 6.d4!!. Besides the two active participants many people can watch and discuss (either amongst themselves or with the active participants). That (and checkels) are why ICC is so popular for coaching.

But keep in mind you can have similar interactions on chess.com. I could post a chess diagram (What would you do here?). Someone else can post their line as a game board (6.Nf3 Bg4 7.h3), and then I could post a game board with d4!!. I've done this before. Also, unrated one-on-one games will feature takebacks soon.

The FICS/ICC is more efficient if several participants online at the same time, but the chess.com format means everyone doesn't have to be online at once, and when takebacks are added will be almost as efficient for one-on-one situations.

grepschrop> I'm behind a firewall so it must be web-based

chess.com is web-based, the other services require special ports to work well. 

sounds good

ICC and FICS are out of the question because of the firewall problem.

 I did not see such a digital analyze board somewhere in the WWW already. So it would be a real NEW feature.

I think the implementation of the feature could be really  lightweighted.

All you need is 

- a board

- a editor to create a position

- some code that manages the "first touch first move" problem because more than two players should be able to share the board

I know it is real work but compared to code that manges chess clocks and 

validates moves it should be not harder (e.g. the editor could allow to create invalid positions[multiple kings etc.] this should be no problem).

 Just to make it clear. I don't want a tool to analyze a game after it was played.

I want a tool to analyze ARBITRARY positions.

Let people analyze some cool endgames in their lunch hour  at chess.com.

And no I don't want load the position from a game. I want create the position  with some mouse clicks and then all analyzers can play the positions.