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nooooo.....
y shouldnt be your armor class...
y is extra bonus/penalty that is not displayed by your thaco.
For example
Your thaco is 12 (strength bonus included)
you are wielding the sword +1 +3 versus shapeshifters.
So your display thaco is 11 (12 and -1 from the sword)
If you attack a gibberling you get y=0
But if you attack a doppler then y=2 (the extra thaco against dopplers)
Similarly if you wear the amulet of thaco +4 vs ogres then it will not change your thaco but when attacking ogres y will be 4.
AFAIK y would also include penalties from fatigue, intoxication, bonus/penalties from some spells and so on.... anything that is not included in the original thaco.
but y will not include bonuses from strength, or weapons and items that directly change your thaco.
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ZFR
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