Interesting ! 4 meter is a lot and I think chinese unit are affected too.

But one thing I never understood is tracking rating and accuracy. How it works ?

tracking rating you can see if you install the tooltips mod. for example: a priest with a tracking rating of 6 can hit all units moving with a speed of 6 or lower.. but a unit with say, 6.32 speed - priest can't hit if that unit is moving. to look up accurate speed of units use that same tooltips mod.

some more examples include: mainline archers and towers before crenelations upgrade have 5 tracking rating, that's the most common tracking rating for units and buildings that shoot. ranged heroes from vanilla cultures (priest and greek ranged heroes) have 6 tracking rating, town center has 10, towers and forts (of all cultures) have 10 _after_ upgrading crenelations, most of the ranged siege has 3.5 (so even a villager can dodge a catapult shot if it's moving since villager speed is 3.8)

about accuracy this is some nice reading directly from developers of the game: http://aom.heavengames.com/cgi-bin/forums/display.cgi?action=ct&f=1,7524,,all#2

basically first shot almost always misses.

also if you're curious: elevation has bonus damage, but rarely in use since you have to be on alfheim cliff or ghostlake cliff otherwise most of the terrain on all maps is flat

[This message has been edited by Legendary Raider (edited 05-09-2017 @ 05:11 PM).]

If i've understand accuracy is a probability to hit the targeted unit for the earlier shots and then (how exactly ?) it hit 100%. But if the unit has a speed > tracking rating it doesn't work at all.
And when I see tracking rating 5/10 it means 5 and 10 with crenelation.

it depends on the distance from an archer to a target unit, among other things dev mentioned in that post I linked - like he said it was made to lessen annoying hit and run with archers what happened in aoe.

5/10 means just that, 5 out of 10 - ten being the maximum tracking rating. info about crenelations is displayed when you hover over the upgrade with that mod I mentioned.

Thank you for your answer

Very interesting, so for exemple an archer can miss his target for a very short range, but it is more rare, and he will be quickly able to succeed all his shots.
Does it means that flee against a gastraphete with a slow unit is a very bad idea ? (because he will miss no shot ?)

Crenellation is one of the most important upgrade from the tower, especially when the ennemi have cav (it makes a *3 bonus for tower) or simply fast units (it apply for all buildings)

Oh, and I suppose that (for the toxote)
param name="Accuracy" value1="0.8"></param is proportionnal value
param name="AccuracyReductionFactor" value1="1.5"></param is the value that determines how the range affect accuracy because petrobolos has 3 and that's why he isn't as accurate as his "0.9 accuracy" says
param name="AimBonus" value1="15"></param What is this ? The bonus after the first shot ?
param name="MaxSpread" value1="5.0"></param This is just the area were the shot can hit if he miss
param name="SpreadFactor" value1="0.25"></param determines how the shots are distributed in the MaxSpread area
param name="TrackRating" value1="5.0"></param is what we sayed

[This message has been edited by eine_gurkensalad (edited 06-12-2017 @ 05:07 PM).]

The Spread is how the Accuracy system works, like a shotgun blast but with one arrow, the lower the spread, the more likely a target will be it. Accuracy just means that the archer has a 90% chance not to miss.

A shotgun Blast ?
I think Accuracy is more complicated because Petrobolos has 0.90 Accuracy and isn't as accurate. it might be the "volley mode" but Catapult hasn't it (same other stats)

[This message has been edited by TAG (edited 01-19-2018 @ 06:52 PM).]

Volley mode is used for units that use multiple projectiles

Spread defines the potential area an arrow can hit (a radius, so for example all archers have a spread area of 5 [about 5 feet ingame]) whilst Accuracy is how precise it is (How likely it will hit the EXACT area), and then tracking is just how smart the unit acts when firing at a moving unit.

The Ranged Attack system seems to be very advanced, but it's just that ES obviously made it more casual, hence why most units in a class will share the same tracking, accuracy, and spread)

[This message has been edited by XLightningStormL (edited 01-23-2018 @ 06:22 AM).]