Since the mechanics of play are simplified, chess games played online tend to use faster time controls than in over-the-board (OTB) play. Longer games (i.e., usually 15 or more minutes per player) are called standard and are also common on the server. Separate ratings are maintained for lightning (under 3 minutes), blitz (usually 5 or 10 minutes), and standard (over 15 minutes). Irregular variants, such as Fischer Random, are grouped together into a handful of formats like Wild, and these are not further classified by time controls.