Counting territory

On a 9x9 game, komi = 0, under Japanese Rules,
and Black kills all the White stones,
at the end of the game, the system says “Black wins by 80”.

question is: shouldn’t Back win by 81?

I think under Ing SST rules, the system says win by 81.
(but I am not 100% certain, I haven’t double-checked this)

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You’re thinking of Chinese, Japanese can be almost any score with ludicrous enough play.

For reference (but not sure if this is what you look for):