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="lowerbound">Bound</th>
 131             <th class="trend">Change</th>
 132           </tr>
 133         </thead>
 134         <tbody t:id="singletop">
 135           <tr>
 136             <td class="username"><t:username /></td>
 137             <td class="rating"><t:rating /></td>
 138             <td class="rd"><t:rd /></td>
 139             <td class="lowerbound"><t:lowerbound /></td>
 140             <td class="trend"><t:trend /></td>
 141           </tr>
 142         </tbody>
 143       </table>
 144     </div>
 145
 146     <div class="box" id="doubleboard">
 147       <h2>Doubles score board</h2>
 148
 149       <table>
 150         <thead>
 151           <tr>
 152             <th class="username">Username</th>
 153             <th class="rating">Rating</th>
 154             <th class="rd">RD</th>
 155             <th class="lowerbound">Bound</th>
 156             <th class="trend">Change</th>
 157           </tr>
 158         </thead>
 159         <tbody t:id="doubletop">
 160           <tr>
 161             <td class="username"><t:username /></td>
 162             <td class="rating"><t:rating /></td>
 163             <td class="rd"><t:rd /></td>
 164             <td class="lowerbound"><t:lowerbound /></td>
 165             <td class="trend"><t:trend /></td>
 166           </tr>
 167         </tbody>
 168       </table>
 169     </div>
 170
 171     <div class="box" id="lastgames">
 172       <h2>Last ten games</h2>
 173
 174       <table>
 175         <thead>
 176           <tr>
 177             <th>Registered</th>
 178             <th>Type</th>
 179             <th colspan="2">Opponents</th>
 180             <th>Score</th>
 181             <th colspan="2" class="rightmost">Rating diff.</th>
 182           </tr>
 183         </thead>
 184         <tbody t:id="lastgames">
 185           <tr>
 186             <td><t:gametime /></td>
 187             <td><t:type /></td>
 188             <td><t:username1 /></td>
 189             <td><t:username2 /></td>
 190             <td><t:score1 /> &#8211; <t:score2 /></td>
 191             <td><t:diff1 /></td>
 192             <td class="rightmost"><t:diff2 /></td>
 193           </tr>
 194         </tbody>
 195       </table>
 196     </div>
 197
 198     <h2 style="clear: left;">About the ratings</h2>
 199
 200     <p>The rating system in use is called <em>FoosRank</em>, and is specially
 201       designed for this site. It is a Bayesian rating system, inspired by
 202       <a href="http://math.bu.edu/people/mg/glicko/">Glicko</a> but re-worked
 203       out from scratch with a statistically sound model of non-binary results,
 204       and adjusted for teams (with some ideas from Microsoft's TrueSkill
 205       system). For those not familiar with Bayesian ratings, the most important
 206       parts are:</p>
 207
 208     <ul>
 209       <li>Your rating is a <em>statistical estimation</em> of your true skill.
 210         It has a mean (the point estimate of your skill) and a deviation
 211         (measuring the uncertainity of the estimate), called the RD. It is approximately
 212         Gaussian.</li>
 213       <li>When you win or lose a game, your rating will change accordingly,
 214         based on your score and your opponent. <em>You do not get 'points'
 215         for winning or losing, the estimate is merely getting more accurate.</em>
 216         In the process, the RD gets lower as you play. However, the RD increases
 217         with time, opening up for the fact that your true skill can change.
 218         (Glicko 2 also supports a volatility measure, which better models change
 219         in true skill, but it has not been implemented here.)</li>
 220       <li>The score board is sorted by a conservative estimate of your rating
 221         (mean - 3 * RD). This makes it non-attractive for people with artifically
 222         high ratings (especially newcomers) to avoid playing to stay high up in
 223         the score board.</li>
 224       <li>The single and double rankings are separate. Even though you play as a
 225         team and all four players' rankings and RDs influence the rating adjustment,
 226         you are ranked as an individual, as we do not usually play with fixed
 227         teams.</li>
 228     </ul>
 229
 230     <p>For the more technically minded, a
 231       <a href="http://home.samfundet.no/~sesse/foosrank.pdf">very rough writeup
 232       on the mathematics behind FoosRank</a> is available in PDF format. It is,
 233       however, by no means finished.</p>
 234   </body>
 235 </html>
 236