git.sesse.net Git - foosball/blob - www/index.xml

   1 <?xml version="1.0" encoding="UTF-8" ?>
   2 <!DOCTYPE
   3   html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
   4   "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   5 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" xmlns:t="http://template.sesse.net/">
   6   <head>
   7     <title>Foosball!</title>
   8     <link rev="made" href="mailto:sgunderson@bigfoot.com" />
   9     <link rel="stylesheet" type="text/css" href="foosball.css" />
  10     <meta name="MSSmartTagsPreventParsing" content="TRUE" />
  11   </head>
  12   <body>
  13     <h1>...on a clear day, you can play foosball forever</h1>
  14
  15     <div class="box" id="addsingle">
  16       <h2>Add a singles result</h2>
  17
  18       <form method="post" action="add-single-result.pl">
  19         <table>
  20           <tr>
  21             <th>Player 1:</th>
  22             <td><input name="username1" value="" size="10" /></td>
  23           </tr>
  24           <tr>
  25             <th>Player 2:</th>
  26             <td><input name="username2" value="" size="10" /></td>
  27           </tr>
  28           <tr>
  29             <th>Score:</th>
  30             <td>
  31               <input name="score1" value="" size="2" /> &#8211;
  32               <input name="score2" value="" size="2" />
  33             </td>
  34           </tr>
  35           <tr>
  36             <td colspan="2"><input type="submit" value="Add result" /></td>
  37           </tr>
  38         </table>
  39       </form>
  40     </div>
  41
  42     <div class="box" id="adddouble">
  43       <h2>Add a doubles result</h2>
  44
  45       <form method="post" action="add-double-result.pl">
  46         <table>
  47           <tr>
  48             <th>Team 1:</th>
  49             <td>
  50               <input name="team1_username1" value="" size="10" /> and
  51               <input name="team1_username2" value="" size="10" />
  52             </td>
  53           </tr>
  54           <tr>
  55             <th>Team 2:</th>
  56             <td>
  57               <input name="team2_username1" value="" size="10" /> and
  58               <input name="team2_username2" value="" size="10" />
  59             </td>
  60           </tr>
  61           <tr>
  62             <th>Score:</th>
  63             <td>
  64               <input name="score1" value="" size="2" /> &#8211;
  65               <input name="score2" value="" size="2" />
  66             </td>
  67           </tr>
  68           <tr>
  69             <td colspan="2"><input type="submit" value="Add result" /></td>
  70           </tr>
  71         </table>
  72       </form>
  73     </div>
  74
  75     <div class="box" id="assesssingle">
  76       <h2>Assess a singles match</h2>
  77
  78       <form method="post" action="assess-single.pl">
  79         <table>
  80           <tr>
  81             <th>Player 1:</th>
  82             <td><input name="username1" value="" size="10" /></td>
  83           </tr>
  84           <tr>
  85             <th>Player 2:</th>
  86             <td><input name="username2" value="" size="10" /></td>
  87           </tr>
  88           <tr>
  89             <td colspan="2"><input type="submit" value="Assess" /></td>
  90           </tr>
  91         </table>
  92       </form>
  93     </div>
  94
  95     <div class="box" id="assessdouble">
  96       <h2>Assess a doubles match</h2>
  97
  98       <form method="post" action="assess-double.pl">
  99         <table>
 100           <tr>
 101             <th>Team 1:</th>
 102             <td>
 103               <input name="team1_username1" value="" size="10" /> and
 104               <input name="team1_username2" value="" size="10" />
 105             </td>
 106           </tr>
 107           <tr>
 108             <th>Team 2:</th>
 109             <td>
 110               <input name="team2_username1" value="" size="10" /> and
 111               <input name="team2_username2" value="" size="10" />
 112             </td>
 113           </tr>
 114           <tr>
 115             <td colspan="2"><input type="submit" value="Assess" /></td>
 116           </tr>
 117         </table>
 118       </form>
 119     </div>
 120
 121     <div class="box" id="singleboard">
 122       <h2>Singles score board</h2>
 123
 124       <table>
 125         <thead>
 126           <tr>
 127             <th class="username">Username</th>
 128             <th class="rating">Rating</th>
 129             <th class="rd">RD</th>
 130             <th class="numgames">Games</th>
 131             <th class="lowerbound">Bound</th>
 132             <th class="trend">Change</th>
 133           </tr>
 134         </thead>
 135         <tbody t:id="singletop">
 136           <tr>
 137             <td class="username"><t:username /></td>
 138             <td class="rating"><t:rating /></td>
 139             <td class="rd"><t:rd /></td>
 140             <td class="numgames"><t:numgames /></td>
 141             <td class="lowerbound"><t:lowerbound /></td>
 142             <td class="trend"><t:trend /></td>
 143           </tr>
 144         </tbody>
 145       </table>
 146     </div>
 147
 148     <div class="box" id="doubleboard">
 149       <h2>Doubles score board</h2>
 150
 151       <table>
 152         <thead>
 153           <tr>
 154             <th class="username">Username</th>
 155             <th class="rating">Rating</th>
 156             <th class="rd">RD</th>
 157             <th class="numgames">Games</th>
 158             <th class="lowerbound">Bound</th>
 159             <th class="trend">Change</th>
 160           </tr>
 161         </thead>
 162         <tbody t:id="doubletop">
 163           <tr>
 164             <td class="username"><t:username /></td>
 165             <td class="rating"><t:rating /></td>
 166             <td class="rd"><t:rd /></td>
 167             <td class="numgames"><t:numgames /></td>
 168             <td class="lowerbound"><t:lowerbound /></td>
 169             <td class="trend"><t:trend /></td>
 170           </tr>
 171         </tbody>
 172       </table>
 173     </div>
 174
 175     <div class="box" id="lastgames">
 176       <h2>Last ten games</h2>
 177
 178       <table>
 179         <thead>
 180           <tr>
 181             <th>Registered</th>
 182             <th>Type</th>
 183             <th colspan="2">Opponents</th>
 184             <th>Score</th>
 185             <th colspan="2" class="rightmost">Rating diff.</th>
 186           </tr>
 187         </thead>
 188         <tbody t:id="lastgames">
 189           <tr>
 190             <td><t:gametime /></td>
 191             <td><t:type /></td>
 192             <td><t:username1 /></td>
 193             <td><t:username2 /></td>
 194             <td><t:score1 /> &#8211; <t:score2 /></td>
 195             <td><t:diff1 /></td>
 196             <td class="rightmost"><t:diff2 /></td>
 197           </tr>
 198         </tbody>
 199       </table>
 200     </div>
 201
 202     <h2 style="clear: left;">About the ratings</h2>
 203
 204     <p>The rating system in use is called <em>FoosRank</em>, and is specially
 205       designed for this site. It is a Bayesian rating system, inspired by
 206       <a href="http://math.bu.edu/people/mg/glicko/">Glicko</a> but re-worked
 207       out from scratch with a statistically sound model of non-binary results,
 208       and adjusted for teams (with some ideas from Microsoft's TrueSkill
 209       system). For those not familiar with Bayesian ratings, the most important
 210       parts are:</p>
 211
 212     <ul>
 213       <li>Your rating is a <em>statistical estimation</em> of your true skill.
 214         It has a mean (the point estimate of your skill) and a deviation
 215         (measuring the uncertainity of the estimate), called the RD. It is approximately
 216         Gaussian.</li>
 217       <li>When you win or lose a game, your rating will change accordingly,
 218         based on your score and your opponent. <em>You do not get 'points'
 219         for winning or losing, the estimate is merely getting more accurate.</em>
 220         In the process, the RD gets lower as you play. However, the RD increases
 221         with time, opening up for the fact that your true skill can change.
 222         (Glicko 2 also supports a volatility measure, which better models change
 223         in true skill, but it has not been implemented here.)</li>
 224       <li>The score board is sorted by a conservative estimate of your rating
 225         (mean - 3 * RD). This makes it non-attractive for people with artifically
 226         high ratings (especially newcomers) to avoid playing to stay high up in
 227         the score board.</li>
 228       <li>The single and double rankings are separate. Even though you play as a
 229         team and all four players' rankings and RDs influence the rating adjustment,
 230         you are ranked as an individual, as we do not usually play with fixed
 231         teams.</li>
 232     </ul>
 233
 234     <p>For the more technically minded, a
 235       <a href="http://home.samfundet.no/~sesse/foosrank.pdf">very rough writeup
 236       on the mathematics behind FoosRank</a> is available in PDF format. It is,
 237       however, by no means finished.</p>
 238   </body>
 239 </html>
 240