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41 lines
1.0 KiB
PHP
41 lines
1.0 KiB
PHP
<?php
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namespace Moserware\Skills\Elo;
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require_once(dirname(__FILE__) . "/FideKFactor.php");
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require_once(dirname(__FILE__) . "/TwoPlayerEloCalculator.php");
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/** Including Elo's scheme as a simple comparison.
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* See http://en.wikipedia.org/wiki/Elo_rating_system#Theory
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* for more details
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*/
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class FideEloCalculator extends TwoPlayerEloCalculator
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{
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public function __construct(FideKFactor $kFactor)
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{
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parent::__construct($kFactor);
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}
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public static function createWithDefaultKFactor()
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{
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return new FideEloCalculator(new FideKFactor());
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}
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public static function createWithProvisionalKFactor()
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{
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return new FideEloCalculator(new ProvisionalFideKFactor());
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}
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public function getPlayerWinProbability($gameInfo, $playerRating, $opponentRating)
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{
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$ratingDifference = $opponentRating - $playerRating;
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return 1.0
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/
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(
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1.0 + pow(10.0, $ratingDifference / (2 * $gameInfo->getBeta()))
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);
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}
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}
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?>
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