Has an NPB (Japan) game ever ended 20-6?

Exactly once. On June 26, 1950, Nishi Nippon Pirates beat Hiroshima Carp 20-6, and no NPB (Japan) game before or since has ended that way. When it happened it was a scorigami, the first 20-6 in league history.

Where 20-6 sits among nearby NPB (Japan) scores. Deeper blue means a score has happened more often; the outlined cell is the new one.

That makes 20-6 the 191st most common final score out of 223 that have ever occurred in NPB (Japan). One point away, 21-6 has happened 2 times and 20-7 has happened 2 times.

Every 20-6 in NPB (Japan) history

Date	Result	Season
1950-06-26	Nishi Nippon Pirates over Hiroshima Carp	1950

Open the NPB (Japan) grid at 20-6