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To begin with , this is not my work , however I didin't saw any server with correct formula and threads in rs most times get deleted I decided to post here.
Original thread:RuneScape - MMORPG - The No.1 Free Online Multiplayer Game
I have tested this formula alot and it really seems that it's like rs.
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To The Accuracy Formula
The goal of this thread is to create a formula for combat accuracy free for everyone to use.
At the moment, the formula needs improvement. So feel free to post confirmation, disproof, ideas or questions. Bumps and data are also highly appreciated. ^_^
I thank Chaos Pooky, Mandulf and Obliv for their contrubution to this thread, the data and on improving the formula.
Determine your accuracy in the following three steps, mostly based on your level and equipment bonus:
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1. Calculate the effective level
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• Take your current (boosted) level from the stats interface (Attack, Ranged, Magic or Defence)
• Multiply this with any prayer or curse adjustments and round down.
• Add up 8.
• Add up the attack style bonus.
• Multiply with the Void Set bonus, if applicable.
• Round down and let 'E' equal this value from here on.
If you wish to calculate the magic defence roll, complete the previous steps for both Defence and Magic.
• Multiply Magic by 0.7 and Defence by 0.3
• Add up Magic and Defence
• Round down and let this equal 'E' in the defender's roll.
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2. Calculate the maximum roll
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• Use the next formula to calculate the amount of sides of the dice.
(A) Attacker's roll: E * (1 + Bonus/64)
(D) Defender's roll: E * (1 + Bonus/64)
• Round down the roll to the integer and - if applicable - multiply the maximum roll with one or more of the following bonuses and/or special attacks:
Attack roll modifiers:
Abyssal whip: multiply by 1.1
Barrelchest anchor: multiply by 2
Brackish blade: multiply by 2
Dragon dagger: multiply by 1.1
Dragon longsword: multiply by 1.1
Dragon slayer gloves: multiply by 1.1
Full slayer helmet, Black mask, Focus sight, Hexcrest: multiply by 7/6
Magic longbow: always 100% accuracy
Magic shortbow: multiply by 1.1
Runic accuracy aura: multiply by 1.05
Salve amulet: multiply by 7/6
Salve amulet (e): multiply by 1.2
Sharpshooter aura: multiply by 1.03
Defence roll modifiers:
Bloodrager: multiply melee defence by % equal to used tier
Deathslinger: multiply ranged defence by % equal to used tier
Stormbringer: multiply magic defence by % equal to used tier
Wolpertinger: multiply magic defence by 1.05
• Round down the value.
If you're using two or more multipliers, make sure you round down the value everytime after applying a bonus. Also note you cannot use the salve amulet and slayer helmet together. Because they do not stack, use the best bonus available.
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3. Calculate the accuracy
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The chance to hit is:
• If A<D:
(A-1) / (2D)
• If A>D:
1 - (D+1) / (2A)
This value (you may want to multiply it by 100) is an estimation of the accuracy. Note that the formula isn't 100% correct, so the results may be slightly off.
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Attack style bonus
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The attack style bonus is determined by the type of attacking in the combat style interface.
Melee:
Accurate: add up 3 Attack levels
Defensive: add up 3 Defence levels
Controlled: add up 1 Attack and 1 Defence level
Ranged:
Accurate: add up 3 Ranged levels
Long range: add up 3 Defence levels
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Prayer bonus
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After adding up bonus levels to your skill level (by drinking a potion, etc.) prayer adjustments will increase the value further by a percentage.
An example:
A player with 99 attack, a super attack potion and piety activated has an invisible level of:
99 + 19 = 118
118 * 1,2 = 141,6
The player's level is effectively 141.
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Void Knight Armour
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Melee Set: multiply by 1.1
Ranged Set: multiply by 1.1
Magic Set: multiply by 1.3
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Summoning Familiars
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Some familiars may modify the defence stats. Note that these modifications will be visible in the equipment stats screen and have already been calculated while the familiar is summoned.
Iron Titan: multiply all melee defence bonuses by 1.1
Steel Titan: multiply all melee defence bonuses by 1.15
Daemonheim familiar (Bloodrager, Deathslinger and Stormbringer) bonuses depend on the tier. Tier 1 equals a 1% boost and tier 10 equals a 10% boost.
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Dwarf multicannon (DMC)
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The accuracy of the multicannon is calculated in the same way as the accuracy of the user. The roll is based on the current attack style of the player.
This isnt the accuracy formula or close to it, I actually came across the post on there forums with this on before, if you carry on along the pages they begin talking about how inaccurate this is to runescapes formula of accuracy.
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