ifier (taken from <code>id</code> column of
<a href='snooker_events.html'>snooker_events</a>)</p></li>
<li><p><strong>round</strong> <code>&lt;int&gt;</code> : Round number of event in which match was played.
<em>Usually</em> event's structure is organized in rounds: sets of matches with
roughly "the same importance". <em>Usually</em> the more round number the "more
important" matches are played. However, there are many exceptions.</p></li>
<li><p><strong>player1Id</strong> <code>&lt;int&gt;</code> : Identi