How BlameLoL picks who to blame

The blame score in six steps

1. 1

   Pull the match

   We fetch the game and its timeline from the official Riot Games API.

2. 2

   Measure 13 stats

   Every stat is scaled by game length or team totals, so a 20 minute stomp and a 45 minute slog compare fairly.

3. 3

   Compare against the lobby

   Each stat is compared with the other players in the same game, as a z-score. Extreme values are capped, so one freak number can’t decide the verdict.

4. 4

   Weight by role

   Stats are averaged with weights for your role. Supports aren’t judged on CS, junglers are judged more on objectives.

5. 5

   Score from 0 to 10

   5.0 is exactly the lobby average. Every 2.5 points is one standard deviation, so 7.5 is clearly ahead and 2.5 clearly behind.

6. 6

   Name the culprit

   The lowest score on each team gets the blame and the highest is the carry. Then we dig through the stats for evidence.

The 13 stats we measure

KDA

Kills plus assists per death, capped at 8 so one stomp can’t break the scale.

Kill participation

The share of your team’s kills you were part of.

Deaths per minute

Lower is better. Dying a lot in a short game hurts more.

Damage share

Your share of the team’s damage to champions.

Gold per minute

All gold earned, divided by game length.

CS per minute

Minions and jungle monsters killed per minute.

Vision per minute

Vision score per minute: wards placed, cleared and controlled.

Objective damage

Your share of the team’s damage to towers, dragons and Baron.

Damage soaked

Your share of the damage the team took and mitigated.

Heals and shields

Your share of the team’s healing and shielding on allies.

Crowd control

Your share of the time your team spent stunning, rooting and slowing.

Time dead

Lower is better. The share of the game spent on the grey screen.

Lane gold lead

Your gold minus your lane opponent’s at 14 minutes. Summoner’s Rift only.

What counts for each role

KDA and deaths matter for everyone. On top of that, each role is judged on what it’s actually there to do.

AFK detection

Riot flags some AFK players itself. BlameLoL also catches the ones who wander around just enough to dodge that flag: after 5 minutes, zero kills and assists, under 3% of the team’s damage, under 1 CS per minute and under 0.2 vision per minute. All of it has to be true, so a player who is present but having a bad game never trips it. AFK players score 0 and are left out of the lobby averages.

The evidence

The score decides who. The evidence explains why: the most damning stats from the blamed player’s game, like “Died 8 times, that’s once every 1.8 minutes.” The worst one picks their title, from a few variants per offense. Hover or tap a title to see what earns it.

• ABSENT WITHOUT LEAVEDid nothing all game: flagged AFK by Riot, or no kills, assists, damage, farm or vision.
• MILK CARTON CANDIDATEDid nothing all game: flagged AFK by Riot, or no kills, assists, damage, farm or vision.
• "BRB" (DID NOT BRB)Did nothing all game: flagged AFK by Riot, or no kills, assists, damage, farm or vision.
• PROFESSIONAL FEEDERDied the most on the team (5+ deaths), or had more deaths than kills and assists combined.
• GOLD DELIVERY SERVICEDied the most on the team (5+ deaths), or had more deaths than kills and assists combined.
• UBER EATS: RIFT EDITIONDied the most on the team (5+ deaths), or had more deaths than kills and assists combined.
• ALL-YOU-CAN-EAT BUFFETDied the most on the team (5+ deaths), or had more deaths than kills and assists combined.
• FIRST BLOOD DONORGave up first blood, or died 3+ times before 15 minutes.
• THE TOURISTTook part in under 35% of the team’s kills.
• PLAYING A DIFFERENT GAMETook part in under 35% of the team’s kills.
• SIDE LANE SIGHTSEERTook part in under 35% of the team’s kills.
• LOST THE LANE KINGDOMFell 1,000+ gold behind their lane opponent by 14 minutes.
• LANE OPPONENT’S FAVORITE PERSONFell 1,000+ gold behind their lane opponent by 14 minutes.
• RENT-FREE GOLDFell 1,000+ gold behind their lane opponent by 14 minutes.
• ALLERGIC TO MINIONSFarmed 1.5+ fewer minions per minute than their lane opponent.
• MINION RIGHTS ACTIVISTFarmed 1.5+ fewer minions per minute than their lane opponent.
• VEGAN (NO CS)Farmed 1.5+ fewer minions per minute than their lane opponent.
• CERTIFIED PACIFISTDealt under 17% of the team’s damage, or got zero kills in a 15+ minute game.
• NOBEL PEACE PRIZE NOMINEEDealt under 17% of the team’s damage, or got zero kills in a 15+ minute game.
• ZERO DAMAGE, FULL CONFIDENCEDealt under 17% of the team’s damage, or got zero kills in a 15+ minute game.
• PLAYING BLINDBarely warded as a support, or bought no control wards in a 20+ minute game.
• WARDS ARE A MYTHBarely warded as a support, or bought no control wards in a 20+ minute game.
• LIGHTS OFF, NOBODY HOMEBarely warded as a support, or bought no control wards in a 20+ minute game.
• PING MERCHANTPinged 40+ times.
• KEYBOARD WARRIORPinged 40+ times.
• ALL CHAT, NO PLAYPinged 40+ times.
• GREY SCREEN ENJOYERSpent 15%+ of the game dead.
• FULL-TIME SPECTATORSpent 15%+ of the game dead.
• RESPAWN TIMER SPEEDRUNNERSpent 15%+ of the game dead.
• DORAN’S FOREVERStill carrying a starter item (Doran’s or Cull) after 25 minutes.
• HUMAN PUNCHING BAGTop 2 on the team in damage taken, bottom 2 in damage dealt.
• SPEEDRUNNER (ANY% DEATH)Shortest average life on the team: 5+ deaths and under 4 minutes alive each time.
• WEAKEST LINKNothing stood out. They just had the lowest blame score on the team.
• PARTICIPATION TROPHYNothing stood out. They just had the lowest blame score on the team.
• MOST AVERAGE OFFENDERNothing stood out. They just had the lowest blame score on the team.

FAQ

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