10.1 The following conditions should be exchanged field athletes area; 10.1.1 end of the first game; 10.1.2 before the start of the third; 10.1.3 is only for the third or a bureau of competition, when the leading score of 11 points a party of 6 or 15 Board a Board of eight time-points. 10.2 Rule 10.1 of the athlete fails to provide for the exchange field area, the exchange immediately upon discovery, scores have been too effective.