Touge races, called Battles, are typically run at night between 2 cars in either "Cat and mouse" or Initial D rules. A series of matches are run with a lead and a chase driver starting either side by side or bumper to bumper at the starting point. If the lead driver manages to create a noticeable gap (also called pulling a gap) between their car and the chase driver by the finish line, he is determined the winner of the match. If the chase driver manages to stay on his opponent's tail, or passes the lead driver to cross the finish line first, he wins the match instead. In the second match, the trailing driver takes the front place and the winner is determined using the same method. If each driver wins one match, sometimes a sudden death match ensues via coin toss to determine the lead position. Sometimes sudden death matches are used when there is not sufficient time to run another 2 matches, or if a driver pleads that his equipment cannot handle the rigour of another round. Whoever wins a sudden death match wins the race. It is important to note that using Initial D rules, if a driver crashes they lose the race and there are no sudden death matches. If not using Initial D rules, then a crash may mean only losing the match, not just the race. As with all street racing, there are no official rules and any advantage that a competitor has may be used as long as the challenging party agrees to the race.