Head-to-head · 12 bouts
Koboyama Daizo and Tochitsukasa Tetsuo have met 12 times in recorded sumo. Koboyama Daizo leads 7–5.
Koboyama Daizo has won with: frontal push out (3), slap down (1), frontal force out (1), beltless armthrow (1), arm lock throw (1).
Tochitsukasa Tetsuo has won with: slap down (2), frontal push down (1), frontal push out (1), frontal force out (1).
| Tournament | Day | Winner | Technique | Ranks |
|---|---|---|---|---|
| January 1983 | Day 15 | Koboyama Daizo | Slap down | Juryo 3 East vs Juryo 12 West |
| July 1984 | Day 12 | Koboyama Daizo | Frontal force out | Maegashira 14 East vs Maegashira 1 West |
| September 1984 | Day 10 | Tochitsukasa Tetsuo | Slap down | Maegashira 13 East vs Maegashira 7 West |
| July 1985 | Day 4 | Koboyama Daizo | Frontal push out | Maegashira 13 West vs Maegashira 7 West |
| May 1986 | Day 8 | Tochitsukasa Tetsuo | Slap down | Maegashira 5 East vs Maegashira 11 East |
| March 1987 | Day 6 | Koboyama Daizo | Frontal push out | Maegashira 1 East vs Maegashira 6 East |
| May 1987 | Day 3 | Tochitsukasa Tetsuo | Frontal push down | Maegashira 6 East vs Maegashira 1 West |
| September 1987 | Day 12 | Koboyama Daizo | Beltless armthrow | Maegashira 12 West vs Maegashira 11 West |
| March 1988 | Day 6 | Tochitsukasa Tetsuo | Frontal push out | Maegashira 2 East vs Komusubi 1 West |
| September 1988 | Day 5 | Tochitsukasa Tetsuo | Frontal force out | Maegashira 13 West vs Maegashira 11 West |
| November 1989 | Day 3 | Koboyama Daizo | Arm lock throw | Maegashira 12 West vs Maegashira 7 West |
| January 1990 | Day 14 | Koboyama Daizo | Frontal push out | Maegashira 2 East vs Maegashira 14 East |
Every bout between the two that is in this database (March 1958 onwards). Technique names follow NHK WORLD-JAPAN.