I am a little worried that the computer figured out my haste-slow combo.  

The hasted hero came out to protect the archers from being attacked and kept them away from the front line.  It was well executed.

Actually, with a simple 'attack of opportunity' system, you could ensure that this tactic works well, by adding the cost to the AI (player) for any attempt to move out of/past a melee.

Well, I'm sure it has been mentioned here previously, but I'd like to add my support to/flesh out a bit the idea of different goals for tactical AI based on who is fighting whom and where.

For example, "AI faction" players should go more for strategic objectives than for immediate tactical advantage. The reasoning process would take into account:

• the general war strategy - attrition strategy means we go for killing off the maximum number of whole units; partisan means we do a hit and run so the player is generally spread thin with a lot of units (high upkeep) with damaged health (low effectiveness); conservative doctrine means we first and foremost limit damage to our units and retreat rather than sacrifice them for victory; decisive battle doctrine means we pull out all the stops to win the battle even though it might mean trouble afterwards; assassin strategy means the battle is weighted towards killing high-level heroes; human wave strategy means we go for maximum damage output irrespectively of losses in order to mop up with second stack, or third stack...; tactical optimization strategy means we concentrate on saving the most of our units while still going after a win or retreating in face of overwhelming odds. Etc.
• mana consumption limits - what can we afford and what we can't, and how valuable mana versus our units' hitpoints is (do we cast that fire bolt for 10 mana in order to save 2-4 hp of our swordsmen?).
• are there any strategically important units in the battle? Heroes (almost a no-brainer...), rare elite units (if the opponent uses a strategy of few elite units protecting a mass of low-cost glass cannons), cavalry (if the opponent's kingdom is large and he has some logistical problems already then being able to quickly relocate your army stacks can be important), very experienced troops (replacing them would be hard for the opponent, while allowing them to live on and advance higher still would be dangerous for us), units specifically tailored to match our faction strengths and exploit our weaknesses, pioneers who might in a moment establish a city in our backyard etc. If there are such important units, then weigh the battle towards protecting yours and killing off theirs. And then the next battle would be presumably easier.
• Do we have a specific objective for the battle, like "weaken this stack enough so it cannot threaten our nearby cities" or "kill off this scout before he learns that we're overextended here and here" or "mop up our backyard so our resources and outposts are safe and we can get back to the actual front" or "We need to live to fight another day, since this is a harassment stack sent here to distract the enemy and absorb a part his forces while they chase us honoring the threat"?
• AI personality - ruthless warmongers will go for a kill more, while crafty pacifists (heh) will more often retreat and delay.
• Faction resources - do our gold, resources and building capabilities allow us to outbuild the enemy (so we prefer a brute force approach to battles, as a modifier to our grand strategy), or perhaps it is the other way around (so we prefer to save our units while conducting an elastic defence and possibly wrecking the enemy's economic base to even the odds).
• Do we need to take this city now at all cost or risk that it falls to another enemy of our enemy (enemy of my enemy is not always and forever my friend) or just weaken it for another pass with our reinforcements? Or perhaps we actually should fake the war while we amass a steamrolling force because this guy actually fights another of our enemies and is doing not so well (which calls for a tactic to actually do LEAST damage and retreat orderly or allow the enemy to retreat unharassed)?

When all of this and more is taken into account, then a general tactic can be chosen for the battle and unit "importance" weights assigned (including flags of "absolute" goals like "this unit cannot die, period." or "this unit must die even if it costs us dearly").

On the other hand, monsters (and ruffians ) would not be concerned with such things at all. They would simply want one of three things:

• wreak havoc and make mayhem - go for maximum damage output (monsters and raiding parties).
• protect their territory - go for tactical optimization (everyone protecting their turf).
• make trouble and vanish - go for a win unless it is costly, in which case go partisan. As I remember those guys grow in strength over time so it is quite a valid strategy (ruffians but not monsters).

When we have the stage set up, then Brad can work his magic on the units and make them execute the chosen tactics. Smartly and of course calculating all those little odds and ends which bog down the mind (vulnerabilities, zones of control, attack types, ranges, spell choices, etc. etc.).

Hope it helps someone, somewhat.

Something I haven't seen other people mention.. and it might be slightly getting ahead of things, but.. if you do come up with an excellent AI, keep a little bit of randomness. Don't always use the optimal tactic. Often, a little bit of unpredictability is a better tactical advantage than taking the obviously best path. You don't want your players to think that they've figured out all your AI's moves and use that knowledge to manipulate it into favorable tactical scenerios. Not only would it make the AI weaker, but also the game more boring.

Some things I have noticed about the tactical AI in 0.86

-It deosn't seem to like casting damage spells, ie dragons and shrills dont use shock, ember or fire breath.

-For mixed melee caster units like shrills it doesn't cast and charge at the same time. There is no reason shrills for instance can't slow and move towards you on the same turn.