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Gameplay and Matchmaking FAQ

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Credit goes to Stumpster for compiling this and Zileas for throughout explaining matchmaking.

IV. Matchmaking and Gamplay

Q: What counts as a magical attack and what counts as a physical attack?

A: The general rule of thumb is that auto-attacks (where you right-click an enemy) are physical and spells (cast with Q,W,E,R) are magical. However, there are exceptions to this rule. In the case of Ashe's Frost Arrow it still appears to deal physical damage, but the slowing affect is magical. This is why if you have Morgana's Black Shield on (blocks magical damage) you still take damage from the attack, but you do not get slowed. Another notable exception is Gangplank's Parley, which can both be dodged (can only happen with physical attacks) but can also be absorbed by Morgana's Black Shield.

Q: How do towers work?

A: Tower aggro is relatively straightforward. Going from highest priority to lowest priority (this is observed, not necessarily 100% always true):

1. Enemy champions damaging friendly champions
2. Other enemy units (Rally flag, Teemo's mushrooms)
3. Closest enemy minions
4. Closest enemy champions

Where this becomes complicated is when people start talking about 'tower juggling'. What happens is that two champions (A and B) are attacking an enemy near his tower (champion C). Champion A deals damage to C and the tower begins to attack him. Occasionally, if champion A stops dealing damage to C, and champion B starts dealing damage to C, the tower will switch targets from A to B, even though it should have continued targeting A until A was either dead or out of range.

The other important thing to know about towers is that when they attack heroes they gradually increase their damage. Ex: We'll assume the tower deals 100 damage, increases at 10% per shot, and maxes at 155%. If a champion tower dives alone and takes all tower hits, it would look like this:

85 damage (starts at 85% standard)
95 damage (increased by 10%)
105 damage (increased by 10%)
115 damage (increased by 10%)
125 damage (increased by 10%)
135 damage (increased by 10%)
145 damage (increased by 10%)
155 damage (increased by 10%)
155 damage (damage is maxed)

When the tower switches targets between champions, the damage will decrease to 125% standard if it is above that. Using the previous example:

85 damage (starts at 85% standard)
95 damage (increased by 10%)
105 damage (increased by 10%)
115 damage (increased by 10%)
125 damage (increased by 10%)
135 damage (increased by 10%)
145 damage (increased by 10%)

*Tower switches to Champion B*

125 damage (reduced to 125% standard)
135 damage (increased by 10%)
145 damage (increased by 10%)
155 damage (damage is maxed)

The only way that this damage increase will go away is if the tower hits a minion or doesn't perform an attack for 4 seconds.

Q: How does ELO work? What does it mean? Where can I see it?

A: ELO is the ranking system used in LoL. The way is works is that when you get matched up against a team, your team will be expected to win or expected to lose, depending on your ELO.


Team A - 1250 ELO Ranking
Team B - 1350 ELO Ranking

In this scenario, Team B is expected to win. If they win, they will gain less ELO because they were the stronger team going in.

Team A - 1250 -> 1242
Team B - 1350 -> 1358

However, should Team A win, they will gain more points than usual because it was an upset.

Team A - 1250 -> 1263
Team B - 1350 -> 1337

Note that this is acting as if the entire team has their own ELO, what actually happens is that a team's ELO is considered depending upon the players inside and other factors. As an example:

A pre-made comes in with these players:

Noob - 1000
N0ob - 1000
Noobie - 1000
Newbie - 1000
Newskis - 1000

Now, this team doesn't have a 1000 point rating when it gets put into the pool. What happens is that they get a slight modification (between 25 and 200 points, I think) because they are a premade, and are expected to be stronger than simple pubs. So, even though all the players are 1000 ranked, the actual team would probably be ranked 1100-1150.

There isn't any way to see your ELO ranking from Normal games. The idea there is that the matchmaking is for fun, and that you shouldn't be worried about losing. When Ranked games come in, those are where the ladders and competitive play will be shown.

Q: How is IP gain calculated?

A: You gain a set amount of IP based upon whether you win or lose (winning gives you more). However, there are also a few other modifiers as well. If it is your first win of the day, you get a sizable chunk of bonus IP (so try to win at least once a day!). If you win the game in a short amount of time, you get some bonus IP. Conversely, if you lose, but the game took an hour you will gain IP for fighting the good fight. In addition, you gain extra IP for playing streaks of games without leaving. Then, if that isn't enough, you can always try out the double IP boost from the Riot Store.

Matchmaking by Zileas

The system guesses how good you are based on who you beat and who you lose to. It tries to make matches where it thinks you have a 50/50 chance of winning.

It knows pre-made teams are an advantage, so it gives you tougher opponents when you are in a pre-made team. We did fancy math to make the pre-made teams vs solo players matching fair. I even ran it by two math Ph.Ds and they said it made sense!


A lot of people have asked how our matchmaking system works, and we’ve seen a lot of posts that advance misconceptions about how it choose matches.

The basic concept is that the system over time understands how strong of a player you are, and attempts to place you in games with people of the same strength. As much as possible, the game tries to create matches that are a coin flip between players who are about the same skill.

The basic priorities of the system are in order:
1) Protecting newbies from experienced players.
2) Fairness & creating competitive matches
3) Finding a match at all. The longer you wait, the less important priorities #1 and #2 are.

How are matches made?

First, the system places you in the appropriate pool –which is basically game type (normal games in general, ranked solo/duo, ranked 5-man team, other game modes, etc).

Once in the pool, the system starts trying to find you matches, the goal being to get a match where the teams are equal and both have a 50% chance of winning.

Step 1: Determine your strength:

  • If you solo queued, it’s just your personal rating (i.e. ranked team rating for ranked team, normal games rating for normal games).
  • If you are in a pre-made team, your rating is the average of you and your team members, along with an increase based on the type of pre-made you are to make sure that you get tougher opponents, because being a pre-made is an advantage. This bonus is calculated from a bunch of research we did on hundreds of thousands of game results to figure out how much of an advantage being in a team is. We do some behind the scenes adjustments as well for stuff like beginners paired with pros, etc.

Step 2: Determine who your eligible opponents might be:
  • Initially, the system will only match you with very similar players based on the rating you have been assigned. Eventually, it gives you less ideal matches because it doesn't want you to be in line forever.
  • Newbies get some special protection and are usually matched vs other newbies.

Step 3: Find a match:
  • Eventually, the system finds a match that is fair for everyone involved, and puts the players into a game.
  • The system then tries to balance the team to make two teams with 50% odds of winning. In our mid-beta pool, which has very few players relative to what is in release, the majority of games created by the system had teams predicted to be extremely fair (no team with odds greater than 55% to win). We expect that in release, that 98%+ of the time we will see games where no team is thought by the system to have a higher than 55% chance to win. This is because adding a small amount of players to the system dramatically improves the quality of matches made, and we expect a lot more people to be playing at release than in closed beta.

How is my rating measured over time?
We use a modified version of the Elo system. The basic gist of the Elo system is that it uses math to compare two player ratings to guess the game result – like, “Bob will win vs Jim 75% of the time”.

From there, the game is played. If you win, you gain points, if you lose, you lose points. If your win was “surprising” (i.e. the system thought you would lose), the points you gain are larger. Additionally, if you are a newer player, you gain and lose points more rapidly so that you get to your skill level faster. Over time, this means that good players end up high rated because they do better than the system expects, until the system is guessing correctly how often they will win.

We modified this for team use, and basically, the concept is that you get a team elo based on whoever is on the team, and if you win, it’s assumed that everyone on the team was “better” than the guess, and gains points. There are some problems with this, but it generally works out, especially if people use pre-mades a little bit.

We also do a few little things to nudge your elo rating in the right direction when you start out so that people get where they need to get faster.
  • We use various proprietary methods to identify players that are significantly more skilled than a typical newb, and boot their rating up a bunch behind the scenes when we notice this.
  • Gaining levels boosts your elo rating a lot. This further helps separate level 30 summoners from low level summoners.

For more details on how the Elo system works on a theoretical level, you can read about it at:

So wait, how did you determine how to deal with pre-made teams vs solos?
Some matchmaking pools avoid this completely by only allowing 5 man pre-mades vs 5 man pre-mades (ranked games, etc).

Others mix pre-mades and solos freely, and to be fair in these cases, we performed analysis on several hundreds of thousands of games to identify how much of a skill advantage this gives people. We found that a variety of factors influence how much of an advantage being a pre-made is, ranging from the size of the pre-made (i.e. 2,3,4,5 people), to the skills of the players involved, to combinations of pros and newbs, to other more subtle factors that must be used as well.

Having found these advantages, we know how much we need to boost your rating by in a team to make a fair match, and apply the appropriate, mathematically justified adjustment. These results in some cases are very surprising (while still appearing correct in the statistics)

While we will not give precise values because those are trade secrets, we can say that:
5-man pre-mades are only moderately stronger than solo queuers.
Partial pre-mades are only a little bit of an advantage.
Newbs don’t benefit much from being in a pre-made, while experts benefit a lot.

Okay, fine, but why do you even match pre-mades vs non-premades at all?
There are a few reasons for this:
  • It helps the system find your skill rating much faster, so that you get fair matches faster. This works because if you pre-make, it reduces the amount that “bad” or “good” luck related to your teammates causes you to win or lose games. If you pre-make, you join up with people of about your skill, and you now get less random teammates boosting you/screwing you, so your rating gets to an accurate value more quickly because more of each game result is due to you and your friend, who are close in skill.
  • We want people to easily play with their friends because they will have more fun if they do, and you can’t have a 5v5 matchmaking pool of all 2 man teams, or all 3 man teams – you need a mixture for it to work. We chose to include 5-man because it’s a lot of fun – if we have large enough pools later, we might separate 5-man premades from the partial pre-mades – but the data we have shows that this won’t improve the fairness of matches much at all, it will be about the same.

Other Common Questions:

Q: Why don’t you include other little details like how many kills I had, etc, to determine my rating?
A: Because this is gamable, and because it’s hard to figure out how much of that was you playing a gank champion (like Twitch or Master Yi), and how much of that was you just being good. It also incents players who wish to boost their rating playing long games where they farm a lot of enemies, rather than winning. By putting as many measurements and incentives as possible on winning, we avoid side behaviors that aren’t as fun, and which confuse the rating process.

Q: So, because I won a few games in a row, I’m going to get an impossible match now, right?
A: Not exactly. Your rating will rise, so you’ll get harder and harder opponents – but we don’t really care if you go 50/50 win/loss, just that you rating seems to be an accurate prediction of game results. Eventually, you will hit your limit, and you WILL see roughly 50/50 win loss though. Players who are above average will tend to do slightly better than 50/50 because there are more players below them than above them, so matches, when made, will tend to be slightly “downwards”. For expert players near the top of our rankings, they will often run 90% win rates.

Q: How will you do persistent teams, like in WoW arenas?
A: This is an EXCELLENT approach and will allow us even better matchmaking. We will do these eventually, and use new methods we develop on our own for a similar purpose. We will need to do elaborate things to figure out how good you are in general (e.g. personal ratings), while allowing you to freely create/destroy teams. This is a big project, but we are really excited about it.

Q: I'm a jerkface leaver. I can game this system by being a jerkface leaver right?
A: No. You incur elo adjustment based upon team result. We don't care if you left or not -- if your team won, you will gain points, if your team lost, you will lose points. You do however incur other penalties for being a leaver. This is because various measures to account for people leaving end up being gamable or cause weird effects on the system. For example, if we reduced the rating loss of your teammates if you left, then you might leave to help them preserve their rating. If we gave you a penalty even if they won, we would be "deflating" the entire system of ratings down over time, causing newbs to run into pros eventaully. Above all else, the system must be "capped" zero sum (so that, there is some inflation, but there is a limit). Otherwise, weird things happen.

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Hello,I've been playing a long time but today I noticed something on turrets.I was solo mid against a solo opponent and my tower (Outer Turret) had an extra 6 damage,while the turrets
on the 2 sides had +12 (2 champions in each).I checked the other towers but I didn't see any damage increase.What's up with that? :P

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Senior Member


Im wondering how much up to date this is...

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Great thanks !

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Its greatfuly written! Now i know how does it exactly works. *Thumbs Up!*

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How does it decided in a ranked game to who will be 1st player and who will be 5th?

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Junior Member



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Junior Member



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Senior Member


Just one question, does ELO also count in classic mode outside of ranked? like if I am premade with a person that has higher ELO but we are not playing ranked, will the MM system still search for people with higher ELO? Or does normal classics only put random lvl 30's together?

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Junior Member


Thanks so much (Y).