No, not a new category. The funny thing is that just by using the button, you can transform area rules effectively to territory rules.Pio2001 wrote: Button go is an altogether different topic, as it introduces a new major category of rules in addition to area style rules (Chinese, New Zealand, AGA, Ing...) and territory style rules (Japanese, Korean...) : the button style rules (area plus button, territory plus button), with new strategic concepts related to the button.
There are only a few corner cases you need to be aware of, but other than the special rulings that were (arguably) introduced into territory rules just to make them explainable without resorting to area origins, only one-sided dame come to my mind right now.
I have already used this at a tournament game under “japanese style” rules, where during the game we discovered a stone that we couldn't say if it was a prisoner or maybe spilled over from a neighbouring board. We played on, filled the dame alternatingly, noticed who passed first (it was White, so White got an extra point), then counted by area.