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Elo Rating

Chess Video

Test Rating Increase, Rating Change, and Opponents' Average with the FIDE Players' Database

1. The Elo results of chess tournaments are submitted to FIDE. FIDE recalculates the Elo results and make corrections if any mistake.

2. Then FIDE writes down the Elo results of each chess player for each tournament submitted into the FIDE Players' Database.

3. The FIDE Players' Database is updated on 1 January, 1 March, 1 May, 1 July, 1 September, and 1 November. The FIDE Players' Database is available online.

4. The test idea is simple: Open the FIDE Players' Database, find the latest Elo calculations for any FIDE chess player you know and test the program.

5.The following is a sample of the original FIDE Players' Database. The real names are changed for Player A, Player B, Player C, and Player D.

Individual Calculations January 2010
Player A Total change: 12.00

Klasse 3H Round 2-4 - Dutch...VariousNED2009-10-31
RcRownchangeKK*chg
206721162.5030.801512.00
Player B2209NED1.0010.63159.45
Player C1959NED0.501-0.2115-3.15
Player D2032NED1.0010.38155.70
6. For the test purposes, read the above table as follows:
- Recalculated by FIDE as of January 2010.
- Elo results of Player A (rated 2116, K-factor 15) for the 3-game chess event:
Rating Increase: 0.80; Rating Change: 12.00; Opponents' Average: 2067.
- Elo results of Player A for 1 game with Player B (rated 2209, K-factor 15),
Player A scored 1.00 (w):
Rating Increase: 0.63; Rating Change: 9.45; Opponents' Average: 2209.
- Elo results of Player A for 1 game with Player C (rated 1959, K-factor 15), Player A scored 0.50 (w):
Rating Decrease: -0.21; Rating Change: -3.15; Opponents' Average: 1959.
- Elo results of Player A for 1 game with Player D (rated 2032, K-factor 15), Player A scored 1.00 (w):
Rating Increase: 0.38; Rating Change: 5.70; Opponents' Average: 2032.

7. Test Chess Calculator for the Elo results of Player A for the whole 3-game event as follows:
- Type: for Rating of Opponent 1: 2209 (Player B)
           for Rating of Opponent 2: 1959 (Player C)
           for Rating of Opponent 3: 2032 (Player D)
- Type for Player’s Rating:    2116 (Player A)
- Type for Player’s Score:     2.5 (w) (Player A)
- Type for Number of Games: 3 (n) (Player A)
- Select Player’s K-factor: 15 (K) (Player A)
- Click Calculate or press ENTER and Chess Calculator must display:
Increase: 0.80 (change)
Rating Change: 12.00 (K*chg)
Opponents’ Average: 2067 (Rc) [Real: 2067] (see table)

8. Test Chess Calculator for the Elo results of Player A for 1 game with Player B as follows:
- Type: for Rating of Opponent 1: 2209 (Player B)
- Type for Player’s Rating:    2116 (Player A)
- Type for Player’s Score:     1 (w) (Player A)
- Type for Number of Games: 1 (n) (Player A)
- Select Player’s K-factor: 15 (K) (Player A)
- Click Calculate or press ENTER and Chess Calculator must display:
Increase: 0.63 (change)
Rating Change: 9.45 (K*chg)
Opponents’ Average: 2209 (Rc) [Real: 2209] (see table)

9. You are welcome to test more with the original FIDE data.

10. Find the link to the FIDE Players' Database by clicking Chess links.

11.To see how the FIDE calculation system works, click Elo Calculation.		Home



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