|
Ratings points are calculated based on points gained or
lost for wins and losses, which in turn are graded against the quality of
the opponent. Additional
weighting for event types are also provided. Results for rated events are
provided to TTNZ at the conclusion of tournaments, with the ratings system
then updated with the results.
After a player completes their first tournament they are added to the
ratings list and given a provisional rating. The provisional rating can be
used by tournament officials for seeding purposes. Players with provisional
rating points are denoted on the ratings list by **
The provisional rating is calculated based on wins/losses from the players first tournament. Provisional ratings will be
adjusted after each tournament as more information becomes available.
Players who have a final rating, who win or lose games against players who
have a provisional rating will not win or lose any ratings points.
Once a player has completed enough games they will qualify for a final
rating. This final rating is calculated based on all games won/lost in all
tournaments played.
A players
final rating will subsequently change over time as more games are played. A player’s rating will change
according to the following calculation.
Ratings Calculation Table:
|
Rating Difference
|
Normal Outcome
|
Upset Outcome
|
|
<25
|
8
|
8
|
|
<50
|
7
|
10
|
|
<100
|
5
|
12
|
|
<150
|
3
|
15
|
|
<200
|
2
|
20
|
|
<250
|
1
|
26
|
|
|
0
|
32
|
The winners rating is increased by the amount in this
table (multiplied by the weighting and age group factor below) and the
losers rating is decreased by the amount in this table (multiplied by the
weighting and age group factor below)
2009 Weightings
|
Tournaments
|
Base Weighting
|
|
New Zealand Championships
|
1.0
|
|
North Islands, Souths,
Vets
|
1.0
|
|
Association
Rated Open Events
|
1.0
|
Age
Groups
|
Open
|
1.00
|
|
Veteran
|
0.75
|
|
Junior
|
0.75
|
|
