ELO ratings helper
npm install ratingssh
> npm install ratings --save
> yarn add ratings
`Usage
javascript
const elo = require('ratings')// or ES6
import * as elo from 'ratings'
// Return the chance of victory for the
elo.chance(1550 / home rating /, 1650 / away rating /);
// Calculate the rating adjustment
elo.adjustment(1550, 1650, -1)
`API
chance
Returns the expected chance of victory for each player ( -> 1.00)
`ts
interface Chance {
// Percentages in 0.00 -> 1.00
white: number
black: number
}
function chance(whiteRating: number, blackRating: number): Chance`adjustment
See Options interface
Returns the adjusted ratings based on the provided result
Adjustment and score range can be adjusted in options
ts// 1: White win, 0: Draw, -1: Black win
type Result = 1 | 0 | -1
interface Adjustment {
// Ratings after adjustment:
white: number
black: number
// Rating shift applied
shift: {
white: number
black: number
}
}
function adjustment(whiteRating: number, blackRating: number, result: Result, kFactor: number = 32): Adjustment
``