Difference between revisions of "To hit"

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'''To hit''' (short for 'chance to hit') is the probability that an attack will hit a target. It is one of the two key factors in determining the success of an attack, the other being damage.
 
'''To hit''' (short for 'chance to hit') is the probability that an attack will hit a target. It is one of the two key factors in determining the success of an attack, the other being damage.
  
 
The to hit can be calculated for melee and ranged attacks, and is calculated differently for players and monsters.  The largest factors for players are weapon (or unarmed) skill and fighting skill - with good training on both skills and decent dexterity, it should be rare to miss most targets.
 
The to hit can be calculated for melee and ranged attacks, and is calculated differently for players and monsters.  The largest factors for players are weapon (or unarmed) skill and fighting skill - with good training on both skills and decent dexterity, it should be rare to miss most targets.
  
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==Player To Hit (Melee and Ranged)==
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==To-hit vs EV==
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The higher an attack's to-hit is compared to the opponent's [[evasion]], the more likely the attack is to land:<ref>{{source ref|0.30.0|attack.cc|1197}}</ref>
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 +
*2.5% of the time, the attack misses regardless of the attack's to-hit or the defender's EV.
 +
*2.5% of the time, the attack hits regardless of the attack's to-hit or the defender's EV.
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*Else, the game checks if <code>1d(to-hit + 1) - 1 ≥ 2d(2 * EV - 1)/2</code>. If this equation is true, then the attack hits. Otherwise the attack misses.
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==Player To Hit (Weapons)==
 
The player's to-hit in melee and ranged combat is determined by the following factors:
 
The player's to-hit in melee and ranged combat is determined by the following factors:
  
 
====Base Value====
 
====Base Value====
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*Start with 15 + dexterity/2 + a random roll between 0 and your fighting skill.
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*Start with <code>14 + dex/2 + 1d(Fighting + 1)</code>.
  
 
====Weapons====
 
====Weapons====
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*Add a random roll from 0 to your weapon skill (unarmed is considered a weapon skill here).
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*Add <code>1d(weapon skill + 1) -1 </code> (number from 0 to weapon skill).
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*Add the weapon's base accuracy; unarmed has +2, or +4 if you have claws.
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*Add weapon base accuracy. (Unarmed has +2, or +4 with [[Claws]])
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*Add your weapon enchantment level and slaying bonuses.
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*Add weapon [[enchant]]ment and any [[slaying]] bonuses.
  
 
====Other modifiers====
 
====Other modifiers====
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*If in wisp, fungus, pig, or non-vampire bat form, add random2(XL*100+100)/100 instead of using your weapon skill above.
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*If in wisp, fungus, pig, or non-vampire bat form, add <code>[1d(XL * 100 + 100) / 100] - 1</code> instead of using your weapon skill above.
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*Subtract 3 if starving, bloodless, or fainting.  Subtract 5 for vertigo.
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*Subtract 5 for [[vertigo]].
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*The player's shield penalty is -1d(ASP) where ASP is the Adjusted Shield Penalty. It is ASP = (Shield EV penalty) - (Shields skill)/(5 + (Size factor)) as explained in the [[Shields]] page. This penalty can be removed completely with enough skill levels in Shields.
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*If you have the eyeballs mutation, add <code>2 * eyeballs_level + 1</code>
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*The player's [[armour]] penalty is then calculated: -1d(ABAP) where ABAP is the Adjusted Body Armour Penalty.
 
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ABAP = (body_armour_base_penalty + max(0, 3*body_armour_base_penalty - str)) * (45 - armour_skill)/45
 
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*[[Barding]] does not affect the to hit penalty despite having an evasion modifier.
 
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*If you have the eyeballs mutation, add 2*[eyeballs level]+1.
 
  
 
====The Roll====
 
====The Roll====
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*Take this total and roll a random number from 0 to total - 1.
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*Take this total and roll <code>1d(total) - 1</code>.
  
 
====Post Roll====
 
====Post Roll====
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*If the player is wearing an [[amulet of inaccuracy]], they get a -5 penalty.
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*Subtract 5 from wearing the [[Amulet of the Air]] or if you [[Ru#Sacrifices|Sacrificed Eye]] for Ru.
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*Subtract 5 if missing an eye (Ru sacrifice) or you are confused.
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*Subtract 5 if confused.
 
*Subtract 6 if you cannot see the target (invisibility).
 
*Subtract 6 if you cannot see the target (invisibility).
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*Add 2 + roll between 0 and 7 if the target is backlit (corona, sticky flame, or haloed and not affected by umbra).
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*Add 2 + roll between 0 and 7 if the target is backlit ([[Corona]], [[Sticky Flame]], or under a [[halo]]).
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*Subtract 2 + roll between 0 and 3 if the target is in umbra and you do not have night vision (Dithmenos power).
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*Subtract 2 + roll between 0 and 3 if the target is in umbra and you do not have night vision (from Dithmenos & Yredelemnul).
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*If the player is bonded to their weapon with the [[Sure Blade]] spell, they get +(5 + remaining duration of Sure Blade (MAX: +15)).
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*The [[Confusing Touch]] spell grants +0 to +(DEX-1).
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*If the player is not wielding a weapon:
 
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**The [[Confusing Touch]] spell grants +0 to +(DEX-1).
 
 
**Being in the following forms grant bonuses:
 
**Being in the following forms grant bonuses:
 
***[[Statue Form]]: 0 to +8
 
***[[Statue Form]]: 0 to +8
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===Hit Dice===
 
===Hit Dice===
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Monsters with the Fighter class flag get a bonus of +(2.5 * [[HD]]). Other monsters get +(1.5 * HD). Decimals are rounded down.
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Monsters with the [[Fighter flag|Fighter class flag]] get a bonus of +(2.5 * [[HD]]). Other monsters get +(1.5 * HD). Decimals are rounded down.
  
 
===Situational Modifiers===
 
===Situational Modifiers===
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Ranged attacks ("beams", to use the game's internal terminology) have a to hit number, just like melee attacks do. This is modified as follows:
 
Ranged attacks ("beams", to use the game's internal terminology) have a to hit number, just like melee attacks do. This is modified as follows:
 
*If you are invisible and the attacker can't see invisible, the to hit number is halved.
 
*If you are invisible and the attacker can't see invisible, the to hit number is halved.
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*If you have [[Deflect Missiles]] running, the to hit number is reduced to a random number between 0 and 2/3 of its value.
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*If you have [[Repel Missiles]], the to hit number is reduced ''by'' a random number between 0 and 1/2 of its value (rounded down).
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*If you don't have Deflect Missiles running, but do have [[Repel Missiles]] running or the Repulsion Field mutation at level 3, the to hit number is reduced ''by'' a random number between 0 and 1/2 of its value (rounded down).
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==References==
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<references />
  
 
[[Category:Game_mechanics]]
 
[[Category:Game_mechanics]]

Latest revision as of 12:47, 28 August 2024

Version 0.30: This article may not be up to date for the latest stable release of Crawl.

To hit (short for 'chance to hit') is the probability that an attack will hit a target. It is one of the two key factors in determining the success of an attack, the other being damage.

The to hit can be calculated for melee and ranged attacks, and is calculated differently for players and monsters. The largest factors for players are weapon (or unarmed) skill and fighting skill - with good training on both skills and decent dexterity, it should be rare to miss most targets.

To-hit vs EV

The higher an attack's to-hit is compared to the opponent's evasion, the more likely the attack is to land:[1]

  • 2.5% of the time, the attack misses regardless of the attack's to-hit or the defender's EV.
  • 2.5% of the time, the attack hits regardless of the attack's to-hit or the defender's EV.
  • Else, the game checks if 1d(to-hit + 1) - 1 ≥ 2d(2 * EV - 1)/2. If this equation is true, then the attack hits. Otherwise the attack misses.

Player To Hit (Weapons)

The player's to-hit in melee and ranged combat is determined by the following factors:

Base Value

  • Start with 14 + dex/2 + 1d(Fighting + 1).

Weapons

  • Add 1d(weapon skill + 1) -1 (number from 0 to weapon skill).
  • Add weapon base accuracy. (Unarmed has +2, or +4 with Claws)
  • Add weapon enchantment and any slaying bonuses.

Other modifiers

  • If in wisp, fungus, pig, or non-vampire bat form, add [1d(XL * 100 + 100) / 100] - 1 instead of using your weapon skill above.
  • Subtract 5 for vertigo.
  • If you have the eyeballs mutation, add 2 * eyeballs_level + 1

The Roll

  • Take this total and roll 1d(total) - 1.

Post Roll

Monster To Hit (Melee)

A monster's to hit is calculated as follows:

Base Value

The base value is 18.

Hit Dice

Monsters with the Fighter class flag get a bonus of +(2.5 * HD). Other monsters get +(1.5 * HD). Decimals are rounded down.

Situational Modifiers

  • An aquatic monster "using the terrain to its advantage" gets +5.
  • A monster wielding a weapon receives that weapon's inherent and magical to hit modifiers.
  • A confused monster gets -5.
  • A monster attacking a backlit defender gets +2 to +9.
  • A monster attacking an invisible target suffers a 35% penalty to its to hit number.

Monster To Hit (Ranged)

Ranged attacks ("beams", to use the game's internal terminology) have a to hit number, just like melee attacks do. This is modified as follows:

  • If you are invisible and the attacker can't see invisible, the to hit number is halved.
  • If you have Repel Missiles, the to hit number is reduced by a random number between 0 and 1/2 of its value (rounded down).

References

  1. ↑ attack.cc:1197 (0.30.0)
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