This is one of the perpetual questions for beginners and often as not, even more advanced players have a hard time sorting out the difference between ukigoshi and ogoshi.
- The name ukigoshi means floating hip, whereas, the name ogoshi means large hip or major hip.
- Ukigoshi feels like your feet get lighter until they slip sideways and you fall. In ogoshi you are spun around a fulcrum off your feet and onto your back
- Ogoshi is a crack-of-the-butt throw - tori's buttcrack goes on uke's thigh or knee. Ukigoshi is not a buttcrack throw
- Ukigoshi often starts with the side of tori's hip in contact with uke's groin. Ogoshi begins with the back of tori's waist against uke's groin.
- Typically ukigoshi is easier with a low grip around uke's waist and ogoshi is easier with a high grip near uke's shoulder.
- In ogoshi, uke slides over tori's low back or kidneys as he turns over onto his back. In ukigoshi there is no slide - uke turns horizontal on tori's hip then drops.
- Ukigoshi tends to drop uke with his feet behind tori. Ogoshi lands uke with his feet in front of tori.
- Often ogoshi is a larger amplitude throw, but ukigoshi is a more severe fall because there is less time to get your fall right.
Following are a couple of pretty good video explanations of these ideas.
[photo courtesy of Basegrinder]