Hidden (?) units.

[plloyd1010]

Okay, here goes.
It isn't absolute double-blind, that would take a moderator. It's pretty close though.

The concept is that all of your undemoralized units, except for unarmed and unloaded transport must be under observation by an observation point, unless otherwise allowed to be hidden. Any undemoralized combat unit or leader may create an observation point. Any undemoralized combat unit or leader observed by the enemy becomes an observation point. Until unit or leader is observed it is hidden from the opposing player.

When the game opens, each player will only see the observation points. Opposing units and leaders within LOS of an observation point are unhidden. Those units and leaders then qualify as observation points. Once everyone who can see each other is unhidded, then you play. Stuff will appear and be rehidden during the game. It leaves a lot of opportunity for bluffing and spoofing.

The biggest drawback we've found using this system, comes from fixed OOB's. One starts to count units. Otherwise it works quite well.