Real OSRS combat maths · 1v1 · duel a player or the house
The Duel Arena, back. Two fighters, real Old School RuneScape gear and combat formulas - accuracy rolls, max hits, attack speeds, Dharok's set effect, dragon dagger and dragon claws specs and tentacle venom all modelled - and a stake in GP on the outcome. The house takes 2.5% of the pot and nothing else.
Both fighters are identical, so a duel is a genuine coin flip and the only thing standing between you and the whole pot is the fight itself. The house is not a participant - it takes a commission on the pot and nothing more, 2.5% against the house or 1% on a player-versus-player duel. Dharok's hits climbing into the 50s and a dragon dagger spec landing twice decide who wins; they never change what the duel costs to enter.
Jagex removed staking from the real Duel Arena in 2021 and replaced it with Ferox Enclave, which is why so many players ended up searching for somewhere else to do it. This is that, with the two things the original couldn't offer: the outcome is generated server-side from a verifiable seed rather than from a client you have to trust, and the payout is automatic.
There's a PvP challenge board for duelling real opponents, and the classic 2D renderer is still live at /duel-arena-classic if you prefer it.
What the rebuild actually models is the fight, not a picture of one. Each loadout carries the real numbers: an abyssal tentacle lands 79.2% of the time for up to 25 and swings every four ticks, with a 25% chance per hit of applying venom that starts at 6 and climbs. Full Dharok's hits far harder and far less often - 26.6% accuracy against its own 250 defence, seven ticks a swing, and the set effect scaling the max hit as health drops until a fighter on one hit point is swinging for 57. A dragon dagger opens with four Punctures, each two hits at boosted accuracy, then settles into an ordinary 18 max. Dragon claws spend two Slice and Dice specials, four strikes apiece, and then the greataxe comes out. The elder maul is the plain heavyweight: full Inquisitor's adds 2.5% to accuracy and damage on crush, so it lands 57.8% of the time for up to 38, once every six ticks, with no special attack at all.
None of that is decoration. The numbers decide the duel, and both fighters carry the same ones, which is what makes the thing a fair coin rather than a house game wearing a costume.
The one place a duel genuinely cannot be drawn is worth explaining, because it is the game's own rule rather than a convenience. When two fighters would both deal lethal damage on the same tick, the one holding PID is processed first and the other is dead before their swing is ever evaluated. PID is drawn once per duel from the committed seed - a straight coin - so there is no tie to resolve and no house-favouring rule quietly deciding one.
Boxing works differently from the other five and is the one loadout where you make a decision. Bare fists have three stances in the real game, all crush, and each is fought here at its own accuracy: punch is the most accurate at 51.4%, kick sits at 50.0%, block at 48.6% - lower, because the defence roll is the defender's and in a mirror match you pay for your own stance. The max hit is 11 on all three, so the stance changes the pace of a fight and never the odds. Because you choose it live, a boxing duel is revealed one round at a time rather than resolved in a single call, and the rounds you have not fought yet genuinely do not exist until you name the stance for them.
The rule screen is the scam the original could never fix: the stake and conditions were agreed in an interface one player could change in the instant before the other accepted. Here there is nothing to change. The loadout is committed with the stake, both fighters get it, and the entire fight is derived from a seed whose hash was published before either side put anything in.
Not for staking. Jagex removed Duel Arena staking in 2021 over scamming and real-world trading concerns, and later replaced the area with Ferox Enclave. Staked duelling now happens off-site.
A commission on the pot and nothing else - 2.5% duelling the house, and just 1% on a player-versus-player duel from the challenge board. There is no rake on top and no fee to open or cancel a challenge.
Yes - accuracy rolls, max hits, attack speeds, the Dharok's set effect, dragon dagger and dragon claws special attacks and venom all follow the game's own formulas. Both fighters are maxed accounts with no food, prayers or potions, so nothing but the gear and the rolls decides the fight.
Yes. The challenge board lets you open a duel at a stake you set, or take one someone else has posted.
No. If both fighters would land a killing blow on the same tick, the one holding PID is processed first and the other never swings - the same rule the real game uses. PID is drawn once per duel from the committed seed, so it is a fair coin rather than a tiebreak that favours anyone.
Yes. Both fighters are identical maxed accounts in the same loadout with no food, prayers or potions, so nothing separates them but PID. You win exactly half the time and are paid 1.95x, which is where the 2.5% commission comes from - the house takes a cut of the pot rather than an edge in the fight.
It is the only loadout with a live decision. Unarmed has three stances and each is fought at its own accuracy, so a boxing duel is revealed round by round as you pick them rather than resolved in one go. The max hit is 11 in all three, so a stance changes the pace of the fight, never the odds.
All six are the same even-money bet, so pick the fight you want to watch. Tentacle is fast and steady with venom on top; Dharok's is slow and violent and gets deadlier as it loses; the dagger front-loads everything into four specs; claws open hard then swap to the greataxe; the elder maul is heavy, accurate and has no tricks; boxing is long, close and the only one you steer.
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