Talk:Gate (Age of Empires II)/@comment-31836517-20170716185442

What does the +20 mean at the building armor class? Is this 20 resistance vs. units with attack bonus vs. building armor? Actually, I don't understand why Villagers deal only 6 attack vs. gates. Shouldn't it be 1+6+3=10 or 1+6+0=7 in case we lose the +3 bonus vs. Bulding armor because of the +20 resistance?