A tumble gives the chance to avoid special tricks. Works as Armour-plating and Chance of Hit. This means the chance to avoid is equal = Level of Tumble/(Level of Tumble+Level of Special trick). In this way the chance to avoid Stunning of 15th level on 20th level of Tumble is equal to 20/(20+20)= 0.5 (50%). Works out automatically in a battle. Is studied in Primary, Middle and Elite Schools of Fencing.