Reference: Monster Manual - Core rulebook III v3.5 pg 57-58
Tactics round by round.
A Pit fiend typically opens combat by using its spell-like abilities, attempting to neutralize dangerous opponents before entering melee.
Prior to combat: Unholy aura, activate fear aura, summon baatezu (another devil)
Round 1.
Quickened fireball and mass hold monster if facing three or more visible, active opponents, otherwise power word stun against unarmed opponent (preferably spellcaster).
Round 2.
Meteor swarm against as many foes as possible, approach worst-injured enemy.
Round 3.
Full attack against injured enemy.
Round 4.
Continue melee against injured enemy, or power word stun against annoying spellcaster.
Round 5.
Repeat from round 1 or greater teleport to safety if endangered.
So how does the PnP recommendation of how a Pit fiend should conduct itself in battle stack up against what we have in the game.
All welcome to add your comments.