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algorithm to rank chess players

Naughty Nightingale answered on January 16, 2023 Popularity 3/10 Helpfulness 1/10

answer algorithm to rank chess players

algorithm to rank chess players

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// CPP program for Elo Rating
#include <bits/stdc++.h>
using namespace std;

// Function to calculate the Probability
float Probability(int rating1, int rating2)
{
	return 1.0 * 1.0 / (1 + 1.0 *
		pow(10, 1.0 * (rating1 - rating2) / 400));
}

// Function to calculate Elo rating
// K is a constant.
// d determines whether Player A wins or Player B.
void EloRating(float Ra, float Rb, int K, bool d)
{

	// To calculate the Winning
	// Probability of Player B
	float Pb = Probability(Ra, Rb);

	// To calculate the Winning
	// Probability of Player A
	float Pa = Probability(Rb, Ra);

	// Case -1 When Player A wins
	// Updating the Elo Ratings
	if (d == 1) {
		Ra = Ra + K * (1 - Pa);
		Rb = Rb + K * (0 - Pb);
	}

	// Case -2 When Player B wins
	// Updating the Elo Ratings
	else {
		Ra = Ra + K * (0 - Pa);
		Rb = Rb + K * (1 - Pb);
	}

	cout << "Updated Ratings:-\n";
	cout << "Ra = " << Ra << " Rb = " << Rb;
}

int main()
{
	// Ra and Rb are current ELO ratings
	float Ra = 1200, Rb = 1000;
	
	int K = 30;
	bool d = 1;
	EloRating(Ra, Rb, K, d);

	return 0;
}

Popularity 3/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: algorithm chess rank whatever

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Contributed on Jan 16 2023

Naughty Nightingale

0 Answers Avg Quality 2/10

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