I/O chain help

I want to set up an I/O chain on my TTT map for a easter egg knife and i want to make it so only the person who figures out the puzzle can enter the secret room. Is there a way of doing this, because currently after its solved it turns into a free for all to get it.

Once the puzzle is solved enable a trigger multiple where the winner is standing.

OnStartTouch
!activator
Addoutput
targetname winner

Now you can use a trigger push or whatever else you want, with filters, to filter through ‘winner’. Everyone else would get pushed back by the trigger push

anyway you can elaborate more on this?

https://dl.dropbox.com/u/17850283/fp_filterexample.png

Thanks