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- app.get('/battle/:winner/:loser', function(req, res){
- if (req.params.winner && req.params.loser) {
- var winner = req.params.winner;
- var loser = req.params.loser;
- db.mget('image:' + winner + ':rating',
- 'image:' + loser + ':rating',
- function (err, ratings) {
- if (err) { throw err; }
- ratings[0] = ratings[0] ? parseFloat(ratings[0]) : 1000;
- ratings[1] = ratings[1] ? parseFloat(ratings[1]) : 1000;
- var winnerExpected = 1 / (1 + (Math.pow(10,(ratings[1] - ratings[0]) / 400)));
- var loserExpected = 1 / (1 + (Math.pow(10,(ratings[0] - ratings[1]) / 400)));
- var k = 30;
- var winnerAdjustment = Math.round(ratings[0] + (k * (1 - winnerExpected)));
- var loserAdjustment = Math.round(ratings[1] + (k * (0 - loserExpected)));
- db.mset('image:' + winner + ':rating', winnerAdjustment,
- 'image:' + loser + ':rating', loserAdjustment,
- function (err, newRatings) {
- if (err) { throw err; }
- res.redirect('/');
- });
- });
- } else { res.redirect('/'); }
- });
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