In judo, making the opponent uncertain requires the mastery of several throws in 3 or 4 different directions and a firm grasp to secure the throw. The system of attacks for 28 judoka (18 men, 10 women) during their 185 respective matches over the competition season of 2001-2002 was analyzed. Practice was regional or interregional. The mean number of matches was 3.3+/-1.1. The mean number of successful directions of attack was 2.5+/-1.3. The mean number of grasps was 1.4 +/-0.5, and the mean time for matches was 08:04+/-03:12. Analysis showed mean number of directions of attack was about 3 and was lower for higher competition although the mean time of matches did not vary significantly. Numbers of directions of attacks were constant for the higher classified judoka. The number of grasps used remained constant. Progress at this level of skill occurs by methodical learning of throws in a coordinated system of attacks. Throws must be complementary to other throws and initiated with one or several grasps.