A Badminton ladder is a ranking of Badminton players in order of their performance. We evaluate players performance based on their match results submitted. A player can challenge other players on the same ladder who are within her/his permitted range.

Badminton ladder is the best way for a group of players who often hit with each other to keep track of their match results. It also make the game more fun and competitive.

Badminton tournament, like any other tournaments, is a group of players compete with each other to select the best player. Badminton tournament can be round robin, playoff or mixed.

Badminton club, network, world are kind of a ladder with some differences:

• A club can contain many ladders and tournaments.
• A network can contain many ladders, tournaments, and clubs.
• A world can contain many ladders, tournaments, clubs, and networks.

(*you might need super admin's permission to create tournaments directly belonged to a network or world)

When signing up for OTW, you are given a certain points according to the skill level claimed. Your points will increase when you win a match and decrease when you loose.

How many points increase or decrease in each match depends on the adjustment factor "K" and the difference between your points and your opponent's. It doesn't depend on the margin of win or lose

• If you beat a stronger player, you get more points and, vice versa, if you beat a weaker player, you get less points
• Adjustment factor "K" is the maximum point a player wins or looses in a match. K depends on the match importance and how many matches the player has been playing. For examples:
  • K of a tournament match is greater than that of a practice match.
  • At the beginning, K of a player is 220. It will be reduced to 122 after this player played 10 or more matches

Ex: We have 4 players A, B, C, D in our ladder

A has 500 points
B has 500 points
C has 900 points
D has 100 points
Suppose K factors for all of those players are the same: 220

• if A beats B: A gains 110 (K/2) points and B looses 110 points
• if A beats C: A gains ~ 200 points and C looses 200 points
• if A beats D: A only gains ~ 22 points and C looses 22 points

If you are interested in the math behind it, you can start from here: Elo Rating System

NOTICE:

• Reward: On top of Elo points, we reward each participant 5 points for playing a match.
• Deteoration: If a player doesn't play any match in 30 days, her/his points will be deducted 20 in each week afterward until she/he starts playing again.

Double has their separate points and they are calculated in a very similar way as single points, using the same Elo rating system.

When two players, say P1 & P2, play with each other as a double for the first time, the double (P1, P2)'s points is the average of those two players' single points.

After that, the double (P1, P2)'s point is updated based on the double's match results is the same way as single points are calculated.

Note:

• Double point of (P1, P2) is not related to double point of (P1, P3)
• Once a (P1, P2) double match result is submitted, not only the double points of the pair (P1, P2) is updated but P1 and P2 single points are slightly changed too.

Example:

Four players P1, P2, P3, P4 have 500, 600, 700, 800 single points respectively. If they play a double match for the first time where (P1, P2) upsets (P3, P4) then their single and double points will be calculated as below:

Before match:

• (P1, P2)'s points before the match: (500 + 600) / 2 = 550
• (P3, P4)'s points before the match: (700 + 800) / 2 = 750

After match, according to Elo guideline:

• (P1, P2) is rewarded ~ 150 points -> (P1, P2) points = 550 + 150 = 700
• (P3, P4) lost ~ 150 points -> (P3, P4) points = 750 - 150 = 600
• P1's points ~ 500 + 150 / 8 ~ 519
• P2's points ~ 600 + 150 / 8 ~ 619
• P3's points ~ 700 - 150 / 8 ~ 681
• P4's points ~ 800 - 150 / 8 ~ 781

We recommend to create a club instead of a ladder. You can create tournaments and child ladders inside your club if needed. If you already created a ladder, you can convert it to a club by hitting the button in tab "Info".

• Log in to your account.
• Navigate to the parrent group where you want to create your group.
• Click on "Create Club", "Create Ladder" or "Create Tournament".
• If you are creating a Ladder or Tournament, choose "Single" or "Double".

Fill in the form. You can leave most of them as default. There are some fields you might need to pay attention to:

• Name: you don't need to add Badminton or Club/Ladder/Tournament to the name.
• Privacy: to set how others view (info, rankings, matches, posts) and join your group.
  • Public: Non-members can view and join your group.
  • Approval: Non members can view but need your approval to join your group.
  • Private: Non members can not view and need your approval to join your group.
  Notes:
  • No matter what privacy you select, noone can see members' email addresses except group's admin.
  • Pending memberships are shown in tab Rankings. Admin will get notification email of membership requests.
• Avatar url / Banner url: url to the image. They should start with http:// and ends by .jpg, .png or .gif