MMR System
How ranking, MMR changes, and weapon leaderboards work in The Depths.
Overview
Every player starts at 1000 MMR. When you participate in a kill — as the killer, a group member, or a solo participant — your MMR changes based on your own MMR relative to the victim's MMR. The victim loses MMR based on the average MMR of the killer's party.
Tiers
Each tier spans 500 MMR. You cannot gain or lose MMR from a player who is more than one full tier away (gap ≥ 500).
| Tier | Min MMR | Note |
|---|---|---|
| Crystal | 4,000 | The elite — 4,000+ |
| Emerald | 3,500 | |
| Platinum | 3,000 | |
| Gold | 2,500 | |
| Silver | 2,000 | |
| Bronze | 1,500 | |
| Iron | 1,000 | Starting point |
Formula
TIER_GAP = 500 // MMR span per tier
CHANGE_PER_STEP = 10 // Max MMR change per kill
divisor = TIER_GAP / CHANGE_PER_STEP = 50
gap = playerMMR - opponentMMR
raw = CHANGE_PER_STEP - gap / divisor
result = clamp(round(raw), 0, CHANGE_PER_STEP)
Every 50 MMR difference changes the outcome by 1 point. At 0 gap you gain +10. At 500+ gapyou gain 0.
Overall Ranking
Players are ranked by MMR (descending). Each attacker's MMR change is calculated using their own individual MMR against the victim. The victim's loss is based on the party average MMR (killer + all group members).
Per-role behavior
| Role | MMR Change |
|---|---|
| Killer | calcMMR(killerMMR, victimMMR) |
| Party member | calcMMR(memberMMR, victimMMR) |
| Rat | calcMMR(ratMMR, victimMMR) |
| Victim | -calcMMR(partyAvgMMR, victimMMR) |
Example — solo kill
Killer 1500 vs Victim 1200 (gap = 300)
Killer: +4
Victim: -4
Example — party kill
Party avg = (1500 + 1800 + 2000) / 3 = 1767, Victim = 1200
Killer (1500): +4 // 10 - 300/50
Party B (1800): +0 // 10 - 600/50 = -2 capped
Party C (2000): +0 // 10 - 800/50 = -6 capped
Rat (1340): +7 // 10 - 140/50
Victim (1200): -4 // -(10 - 567/50) = -1 → 0, party avg 1767 vs 1200 > 500 gap → 0
Weapon Ranking
The weapon leaderboard is separate from MMR. It ranks players by K/D ratio for a specific weapon (minimum 1 kill). Ties are broken by total kills. The weapon shown per player is their last known MainHand weapon from their most recent event — regardless of role (killer, victim, party, or rat).
MMR has no effect on the weapon leaderboard. A player with low MMR can still top a weapon page if they have a good K/D with that weapon.