ELO rating is a number indicating the playing strength of a chess player. Based on ELO rating two players to be controlled to the results to be expected. If a game has been played where the rating changes from both players.

## Background

Of ELO rating system was designed by the Hungarian Arpad Elo.In the 70’s began several chess federation, including the Dutch and the Dutch Federation FIDE world to keep the rating. There are several methods to calculate ELO ratings. These differences are minimal, but it leads to KSNB rating may differ from example FIDE ratings. Rating list of the Dutch Association published four times per year. All parties who played during the time then processed.

## Principle

The principle of ELO’s really very simple. When two chess players with a rating play against each other, when the chess player who wins it will gain ELO points and with chess player who loses will suffer from lower ELO rating. How big is the drop is dependent on the strength of the opponent. To win, a player with a higher rating, more points than winning an inferior opponent. Conversely, losing a stronger player less painful than losing a paper less good players. The next paragraph states that further development.

## Calculation

What is now changing the grade is calculated after a match was played? To begin with, we look at the expected result. This will require first berkend difference in the ratings. Suppose the white player has a rating of 1600 and the black player has a rating of 1720. The rating difference is 120 in favor of the black player. The table at the bottom of this article can be found now that the expected score for white 0:34 and 0.66 for black.

Suppose now that the game is a draw. That means a half-point for both players. White players as it has done better than expected, and black are slightly less well done. The new rating for both players is calculated with the following formula:

Rn = Ro + K *

Where:

- Rn = new rating
- Ro = old Score
- W = Got results for the player in the party
- We = The expected results for the player based on the current rating
- k = ‘factor k’

K factor determines how quickly changes the valuation of a player and has a stabilizing effect. According to FIDE regulations to be played on players with less than 30 lots, a k-factor of 25 is applied. If a player

more than 30 games played and is still in its rating in 2400, when the k-factor of 15. For the real top with a rating of 2400 is the k-factor is equal to 10.

If we assume k = 25 in the example above, then the new rating of the players:

- VIT: Rn = 1.600 + 25 = 1604 *
- BLACK: RN = 1.720 + 25 = 1716 *

White won if he had earned a lot more rating points:

- VIT: Rn = 1.600 + 25 * = 1616,5
- BLACK: RN = 1.720 + 25 * = 1703,5

If Black would have won, he had earned some points:

- VIT: Rn = 1.600 + 25 * = 1591,5
- BLACK: RN = 1.720 + 25 * = 1728,5

## Startbetyg

The above calculations are of course only possible if both players have a rating. The valuation of a new player is calculated using the results of its first series of parties. If he has played seven games, for example, got a score of 3 points and his opponent had an average rating of 1462, he gets the next start-rating:

- W = 3/7 = 0:43
- R = Rmean + Delta Rating
- R = 1462-1460 = 1412

## Top 10 in the Netherlands

## Delta’s Rating And Expected Results

## Gallery

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