Technical limitations of protective floor matting in the early 20th century lead to the emphasis of newaza at this level to limit injuries incurred on inexperienced judoka from nage-waza (投げ技?, throwing techniques). In 1925, Jigoro Kano introduced new rules limiting the amount of time the judoka could stay on the ground. It was stipulated that techniques had to start from tachiwaza (standing stance) and if you pulled your opponent down more than three times he was declared the winner. However, kosen (高専, kōsen?) schools continued to hold interscholastic competition (高專大会, kōsen taikai?) tournaments with former rules and the style compatible with this ruleset became popularly known as Kosen judo. Kosen judo, as a distinct style, flourished in the Kyoto region until around 1940.[2] The style and the peculiar ruleset is still studied for "seven imperials judo" (七帝柔道, shichitei jūdō / nanatei jūdō?) tournaments of (former) imperial universities practising them —————————————————————————————— 上世纪二十年代初期，保护性软垫的技术限制导致了，在同一级别中newaza 的重点是限制经验不足的柔道手因为投技而产生伤害。1925年，Jigoro Kano 制定了新的规则，将柔道手的的地面时间大大延长。它规定了技术必须从站立状态开始，并且将你的对手放倒三次，就为获胜者。然后，高等院校把从前的规则和风格兼容起来，举办校级联赛（高专大会），俗称高专柔道。高专柔道作为一个独特的体系，活跃于京都地区直到1940年。其风格和独特的规则依然被七帝国柔道大赛所练习和研究
