Head-to-head · 12 bouts
Hoo Tomomichi and Koboyama Daizo have met 12 times in recorded sumo. Koboyama Daizo leads 9–3.
Hoo Tomomichi has won with: frontal force out (3).
Koboyama Daizo has won with: frontal force out (3), frontal push out (2), beltless armthrow (2), slap down (1), thrust down (1).
| Tournament | Day | Winner | Technique | Ranks |
|---|---|---|---|---|
| September 1981 | Day 3 | Koboyama Daizo | Frontal force out | Juryo 1 East vs Juryo 5 West |
| November 1981 | Day 14 | Hoo Tomomichi | Frontal force out | Maegashira 12 West vs Maegashira 11 West |
| March 1982 | Day 3 | Koboyama Daizo | Slap down | Maegashira 11 West vs Maegashira 6 West |
| July 1982 | Day 14 | Koboyama Daizo | Frontal push out | Maegashira 11 East vs Maegashira 7 West |
| March 1984 | Day 5 | Koboyama Daizo | Beltless armthrow | Maegashira 6 East vs Maegashira 7 West |
| November 1984 | Day 11 | Hoo Tomomichi | Frontal force out | Maegashira 11 East vs Maegashira 10 West |
| March 1985 | Day 8 | Koboyama Daizo | Thrust down | Maegashira 3 East vs Maegashira 10 West |
| July 1985 | Day 6 | Koboyama Daizo | Frontal force out | Maegashira 13 East vs Maegashira 7 West |
| September 1985 | Day 14 | Koboyama Daizo | Frontal force out | Maegashira 5 West vs Komusubi 1 West |
| September 1988 | Day 12 | Koboyama Daizo | Beltless armthrow | Juryo 2 West vs Maegashira 11 West |
| November 1988 | Day 14 | Hoo Tomomichi | Frontal force out | Maegashira 13 East vs Maegashira 8 West |
| January 1989 | Day 4 | Koboyama Daizo | Frontal push out | Maegashira 9 East vs Maegashira 13 West |
Every bout between the two that is in this database (March 1958 onwards). Technique names follow NHK WORLD-JAPAN.