Head-to-head · 12 bouts
Kotogatake Koichi and Ryumon Masakatsu have met 12 times in recorded sumo. Kotogatake Koichi leads 8–4.
Kotogatake Koichi has won with: hand pull down (2), frontal force out (2), backward pivot throw (1), over arm throw (1).
Ryumon Masakatsu has won with: frontal crush out (2), thrust down (1), underarm throw (1).
| Tournament | Day | Winner | Technique | Ranks |
|---|---|---|---|---|
| September 1975 | Day 7 | Kotogatake Koichi | Hand pull down | Makushita 2 West vs Juryo 12 West |
| September 1976 | Day 15 | Ryumon Masakatsu | Frontal crush out | Juryo 2 West vs Maegashira 11 West |
| January 1977 | Day 10 | Kotogatake Koichi | Backward pivot throw | Juryo 2 West vs Juryo 1 West |
| July 1977 | Day 13 | Ryumon Masakatsu | Frontal crush out | Maegashira 11 East vs Juryo 3 West |
| September 1977 | Day 8 | Kotogatake Koichi | Over arm throw | Juryo 4 East vs Juryo 12 East |
| May 1978 | Day 5 | Ryumon Masakatsu | Thrust down | Juryo 9 East vs Juryo 3 West |
| July 1978 | Day 11 | Kotogatake Koichi | Frontal force out | Juryo 6 East vs Juryo 9 West |
| September 1978 | Day 10 | Ryumon Masakatsu | Underarm throw | Juryo 7 East vs Juryo 8 East |
| November 1978 | Day 3 | Kotogatake Koichi | Frontal force out | Juryo 12 East vs Juryo 6 West |
| March 1980 | Day 11 | Kotogatake Koichi | — | Makushita 12 West vs Makushita 5 West |
| September 1980 | Day 3 | Kotogatake Koichi | — | Makushita 1 East vs Makushita 2 East |
| November 1980 | Day 8 | Kotogatake Koichi | Hand pull down | Juryo 13 East vs Juryo 11 West |
Every bout between the two that is in this database (March 1958 onwards). Technique names follow NHK WORLD-JAPAN.