The core reason you can’t drop tiers by losing is to combat “ladder anxiety.” If you were able to drop tiers you might be uncomfortable playing after reaching the next tier. We want you to immediately set your sights on the next tier and work towards that goal with the confidence that the system won’t demote you if you hit a losing streak.
Right now we’re not too worried about the upper tiers getting overpopulated. As the veterans improve and move on to new tiers of competition, new players will constantly be filling in the lower leagues. We will, however, be monitoring the population levels to ensure they’re still supporting a positive player experience. In the event that higher tiers do start getting crowded, we can always make falling into a lower tier a consequence of losing.

There are five normal tiers and then the challenger tier. Each tier has five divisions. When you win a game you get league points and when you lose a game you lose league points.

When you have 100 league points you will enter a promotion series. A division promotion series means you have to win two out of your next three matches to get promoted, while in a tier promotion series you have to win three out of five.

Once you enter a tier, you can not drop from it by losing games -- but you can drop divisions. So if you are Gold I you could potentially drop to Gold II, but as long as you are active you will never get demoted to Silver tier.

As mentioned earlier, you can lose League Points by losing games, and this point loss will drop you divisions but NOT tiers when you go below 0.

But, when you're inactive for 28 days, your League Points start decaying. This point loss will drop both divisions AND tiers -- again, when you go below 0.

The decay rates are set by tier:

Bronze: No weekly decay (I assume this means you will stay in Bronze 1 unless you decide to lose some games)
Silver: 10 per week
Gold: 25 per week
Platinum: 35 per week
Diamond: 50 per week
The challenger tier is different - it has no divisions, and league points have no upper bound. Only 50 players and 32 teams (correct me if I'm wrong on the solo count) are allowed in there, and when a new challenger enters the tier, the person with the least league points will get demoted to Diamond I (the top division of the otherwise top tier).
Inactivity starts after 7 days, not 28.

When someone completes their Promotion series for Challenger, the lowest player / team in Challenger is Bumped and dropped to Diamond I. This seems to be in order to keep the challenger as a list of the best current players in League of Legends.

The priority list for bumping out of Challenger:

If any player / team is inactive (remember, 7 days), only an inactive player / team can be bumped.
The player / team with the lowest league points will be bumped.
(Unknown behavior to resolve LP ties)
To summarize:

Can you drop tiers other than Challenger?
Yes, by Decay ONLY.
Can you drop divisions?
Yes, by Decay OR Losing.
Can you drop Challenger tier?
Yes, by Decay OR Losing OR Bumped.

faethia napísal:ak dostanes viac krat warning a na tribunale to 5x posudia na ban tak budes mat ban. Ak si este v zivote nemal tak dostanes na 3 dni potom na 2 tyzdne ale nie som si isty ako to je presne