How to read attack roll feedback messages?

Comments

• BelgarathMTH Member Posts: 5,653

  October 2018 edited October 2018

  I can't make sense of that wiki entry either.
  
  I always figure the number as their Thac0 against my AC. If their Thac0 is 10 and my AC is 0, they need a 10 or greater result to hit me. If their Thac0 is 10 and my AC is -1, they need an 11, etc.
  
  Somebody will come along and explain this better than I can.
  
  That adjustment to the base roll, or so I've always thought, is the sum of all the attacker's Thac0 modifiers including magic weapon, strength, spells, etc.

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• kjeron Member Posts: 2,367

  October 2018 edited March 2020

  The display is formatted as such:
  (1d20 roll) + (luck + modifiers) = (result) You will hit, excluding critical hits/misses, if:
  (result) >= (Base THAC0 - Target AC)
  "Luck" is your cumulative of these modifiers:

  • Luck
    
  • Chant
    
  • Bad-Chant
    
  • Fatigue
    
  • Intoxication
    

  Capped between two values:
  (20 - 1d20 roll) >= value >= (1 - 1d20 roll)
  
  "Modifiers" is the cumulative value of all of the following:

  • Your:
    • Proficiency: +/-#
      
    • Strength/Extra: +/-#
      
    • Dexterity: +/-#
      
    • Missile Adjustment: +/-#
      
    • Bonus: +/-#
      
    • Fist Bonus: +/-#
      
    • (Race): +/-#
      
    • (Weapon Style): +/-#
      
    • (item-name): +/-#
      
  • Your hidden modifiers (not listed in either the record or inventory breakdown):
    • opcode 284: (varies) - Melee THAC0 bonus - not used outside of Mods
      
    • opcode 178: (varies) - THAC0 vs type bonus (evil,demons,undead,etc)
      
    • Berserk(+2)
      
    • Invisible(+4) - only against targets that cannot see invisible
      
    • Racial Enemy: (+4)
      
  • Your Opponents situation:
    • Range: (-8) - too close while you are using Missile Weapons
      
    • Attack of Opportunity: (+4) - opponent is Unarmed/Ranged while you are attacking in Melee
      
    • Visibility: (-4) - opponent is invisible and you cannot see invisible
      
    • AC vs type: (varies) - (crush,slash,evil,lawful,trolls,etc)
      

  
  "Base THAC0" includes the following:

  • Base THAC0
    
  • Modifiers listed as "to-hit" in the inventory screen THAC0 display
    
  • Blindness: (-4)
    
  • Bless: (can vary)
    
  • Aid: (can vary)
    

  
  "Target AC" includes the following:

  • Base AC
    
  • Generic AC Modifiers (items/spells)
    
  • Targets Dexterity: (varies)
    
  • Targets Weapon Style: (varies)
    
  • Target is Blind: (+4)
    

  
  

  Post edited by kjeron on March 2020

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• Thunderburp Member Posts: 51

  May 2021

  Just for the record since Kjeron's post is now linked to from the wiki:
  
  In original editions of the game, the Base THAC0 and Target AC from the post above will be affected differently by the Blindness effect, which causes a +10 penalty to THAC0 and no penalty to AC instead of Enhanced Edition's +4 penalty to THAC0 and AC.

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