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Just dispense with the false suspense: Tell the PCs what the AC is.
The gain you get in a smooth running game far outstrips the benefits of "secret AC."
Power Attack. Combat Expertise. And all other feats which rely on players choosing actions at the cost of attack penalty.
There is a great feat in Arcana Evolved which allows to take a free move action several times a day. In other words, one can put everything into move and full attack, however, by default, full attack action eats move action.Two very quick comments, admittedly without a lot of thought behind them:
1) I have no problem with PCs being able to do things the monsters can't, and vice versa.
2) There are existing feats that are similar-- Superior Cleave (Oriental Adventures) lets you take a 5 foot step after you drop an opponent. I could certainly get behind a similar feat-- or, frankly, a blanket permission-- that allows a fighter to move after dropping an opponent, provided he has not moved yet. Basically, allow you to break up your full attack at any point, with one move, provided that such movement wouldn't otherwise provoke an AoO.
But not attack -move a bit - attack -move a bit more - attack, etc.
Having played a character with this feat, I'd say that this is the best of both worlds. Your fighter gets a great boost, but you're not going to abuse it. Usually it just means that the round you charge (or move) is not wasted.
Hmm... The levels of success method breaks such a solution. Gantros, do you allow the attack multiplier if the combatant has moved?
And while I am thinking of it, do you do anything different with multiple attacks? (Claw/Claw/Bite routines and the like.)
I am in favor of "single roll - multiple hits", HOWEVER, while it looks good on paper, it introduces greater swinginess of results. With multiple hits decided by a single roll and 3-4 rounds of combat, it's easy to totally miss the fun with 3-4 unlucky attack rolls while with 3-4 times three rolls (for a total of nine or twelve rolls) the average number of hits is more probable.
In other words, when foregoing multiple rolls in favor of a single roll, one would have to also forego d20 in favor of a more GURPS like test, with multiple dice heavily favoring certain average (for example: 4d6 - 3).
Regards,
Ruemere