The RoboCup Soccer Simulator

[15.2.1] * Fixed a bug of the backpass detection. Two or more players from different teams kick the ball in the same game cycle, the back passer candidates are erased. [15.2.0] * Fixed an issue with the CatchRef which did not allow a goalie to catch the ball, after having intercepted it from an opponent, dribbled to its own area and catch it. Regardless of the interception position, this should never lead to a foul being called. Thanks go to Fernando Almeida for reporting the problem and providing the patch. * Changed the defalut value of server::log_date_format from "%Y%m%d%H%M-" to "%Y%m%d%H%M%S-". * Fixed a defect of boost detection.