Lockout buttons for quiz games

Hi!

I'm trying to make a simple lockout buttons for family games. I thought that program like the one in the attachments will be enough, but during tests it turned out, that if I press I1 and I2 simultaneously, both outputs will be turned on. Do you have any ideas how to prevent it?

Thanks in advance ;)

Ok, so I've tried a different approach with stopwatches instead. Now if I hit both buttons simultaneously there is no reaction on outputs and it stays the same no matter which button will be relesed first. This method doesn't meet its purpose, but at least now the outcom seems more fair play.

Turns out that 10ms sample is still to much. Do you have any idea how I could decrease it?

If you don't need the measured time, then do it like on the picture. The first button will set Qx, if both buttons are pressed inside one Logo cycle, no output is set. It makes no effect, which button is released last, the output of the first button stay on, until reset is pressed.

Regards, Scorp

Thanks for all the help and feedback. I consider this problem fixed.

Regards ;)