Who shots first

[McIvan]

Pat,

Op fire chance of triggering is 1/(1+Range in hexes).

So 50% at one hex range, 33% at 2 hexes, 25% at four and so on.

That assumes your tank has enough action points left to fire in the first place.

Tactically, I'm with Digger. Turn op fire off, leave the T34 in a position where it can't be see, and swarm the Tiger in your own turn.

Op fire will drive you nutty. You are usually better off not using it.