- ry ū ▁j ō j ut su ▁( s ometimes ▁known ▁as ▁Sh into ▁Mus o - ry u ▁j ō do ▁- ▁" Sh indo " ▁is ▁also ▁a ▁valid ▁pron unci ation ▁for ▁the ▁leading ▁character ), ▁is ▁re put ed ▁to ▁have ▁been ▁invent ed ▁by ▁the ▁great ▁s words man ▁Mus ō ▁G onn os u ke ▁K ats uy oshi ▁( 夢 想 ▁ <0xE6> <0xAC> <0x8A> 之 助 ▁ 勝 吉 , ▁fl . ▁c . 1 6 0 5 , ▁date ▁of ▁death ▁unknown ) ▁about ▁ 4 0 0 ▁years ▁ago , ▁after ▁a ▁bout ▁won ▁by ▁the ▁famous ▁Mi y am oto ▁Mus ashi ▁( 宮 本 ▁ 武 <0xE8> <0x94> <0xB5> , ▁ 1 5 8 4 – 1 6 4 5 ). ▁According ▁to ▁this ▁tradition , ▁G onn os u ke ▁challeng ed ▁Mus ashi ▁using ▁a ▁b ō , ▁or ▁long ▁staff , ▁a ▁weapon ▁he ▁was ▁said ▁to ▁w ield ▁with ▁great ▁skill . ▁Although ▁other ▁accounts ▁of ▁this ▁first ▁du el ▁disag ree , ▁according ▁to ▁the ▁or al ▁tradition ▁of ▁Sh int ō ▁Mus ō - ry ū , ▁Mus ashi ▁caught ▁G onn os u ke ' s ▁b ō ▁in ▁a ▁two ▁sword ▁" X " ▁block ▁( j ū ji - d ome ). ▁Once ▁in ▁this ▁position , ▁G onn os u ke ▁could ▁not ▁move ▁in ▁such ▁a ▁way ▁as ▁to ▁prevent ▁Mus ashi ▁from ▁deliver ing ▁a ▁counter att ack