It's that time again, when we see which of the women of the Houston Roller Derby league are queens of the track, and which are mere scrubs. It's the 2013 Championship Bout. There's no telling who will take the brass ring this year. The Bayou City Bosses and the Valkyries fought to a nail-biting tie last month, and it was only through a season-long point spread that the Bosses narrowly won the right to challenge the Psyche Ward Sirens for first place. ''The Bosses have both won against and lost to the Sirens this year, so the two teams are tied against each other heading into the championship bout,'' said Grrl Friday of the Bosses by e-mail. ''This could possibly be the year that the Bosses topple the Sirens and take that championship trophy back!'' Meanwhile, the Valkyries will vie for third place against the Brawlers. Tension is amazingly high, and amid rumors of several last-minute practices, the teams have become virtually equal in skill, so expect every point to come with a fight.