Accuracy

Common = Dex × 1.2 + Level × 2 + Luk × 0.6

Beginner: Acc = trunc(Common / 2.5 + 5)
Warrior:  Acc = trunc(Common / 2.5 + 10)
Magician: Acc = trunc((Int × 1.2 + Level × 2 + Luk × 0.6) / 5.1 + 20)
Bowman:   Acc = trunc(Common / 4.8 + 20)
Thief:    Acc = trunc(Common / 4 + 15)

Avoid = trunc(Luk / 3) + trunc(Dex / 6) + 5

• DEX, INT and LUK are your totals, gear and buffs included. Accuracy and avoid printed on gear go on top.
• Magicians read INT in place of DEX and divide by 5.1, so each point does the least for them.
• A level 30 thief with 40 DEX and 120 LUK: (48 + 60 + 72) / 4 + 15 = 60 accuracy, and 40 + 6 + 5 = 51 avoid.

Beginner: Acc = Common / 2.5 + 5
Warrior:  Acc = Common / 2.5 + 10
Magician: Acc = (Int × 1.2 + Level × 2 + Luk × 0.6) / 5.1 + 20
Bowman:   Acc = Common / 4.8 + 20
Thief:    Acc = Common / 4 + 15

BaseChance = Acc × 100 / ((max(0, LevelDiff) × 2 + 51) × 5)

Spread = 0.15 + 0.2 / (1 + exp((BaseChance − Avoid) / 12))

Roll = rand(1 − Spread, 1 + Spread)

DidHit = Roll × BaseChance ≥ Avoid

• LevelDiff only counts when the monster is above you. Five levels under it cuts your BaseChance by about 16%; out-levelling it gives you nothing back.
• The spread is ±35% when you are far behind the avoid, ±25% when level with it and ±15% when far ahead, so enough accuracy settles into a sure hit.
• A level 30 thief with 95 accuracy against a Jr. Necki (Lv 21, avoid 14) hits 100% of the time. 47 accuracy would already do it.

Try itHit chance against a monster

The monster

Monster

×

Its level−+

Its avoid−+

You

Your level−+

Your accuracy−+

Jr. WraithLv 34 · Avoid 25

66.2%

Chance to hit

The monster is 4 levels over you, which shrinks BaseChance.

Hit 66.2%Miss 33.8%

BaseChance

27.12

Spread

±24.1%

Roll needed

0.922

Sure hit at

95

About 1 swing in 3 misses. 15 more accuracy and you never miss here.

Avoid is the monster’s own number from the client. The roll is uniform, so the chance shown is exact.

The accuracy that never misses the release's most evasive monsters, at their level and ten levels under:

AutoHit if BaseChance − Avoid ≥ 25 + LevelDiff × (Level / 2 + 15)

• With no level gap, BaseChance has to clear avoid by 25. The roll is usually sure long before that: the rule only changes anything past about 371 accuracy against 121 or more avoid.
• Each level the monster has on you adds Level / 2 + 15 to the 25, so under a monster it never comes up.
• The most avoid on a release monster you can fight is Crimson Balrog’s 57. In practice the roll decides every hit.

Passing the roll is not always the end. A miss-chance debuff on you is rolled after a hit lands and can still turn it into MISS. The routine does not name the debuff.

• Darkness is the likely one: Fairy 3, Jr. Boogie 2 and Shade cast it on players, and its skill row holds a 50.

These debuffs never roll accuracy. They use their own success rate. No attack skill does this.

• ThreatenPage
• SlowF/P Wizard
• SlowI/L Wizard