To answer exactly, I need to know more about how you set up your
patterns. If every point gets one, and exactly one 3x3 pattern, then
fixing one 3x3 pattern is required. If some points have no 3x3
pattern, then you're implicitly fixing an "other" pattern to a value
of 1 and then no fixing of a 3x3 pattern is needed.
Just like 3x3 patterns, any orthogonal subset should have one value
fixed...
Does that help?
When teaching a position, all legal positions get a pattern. This
means positions that would be suicidal, ko, or aren't empty get no
pattern. All legal positions get exactly one 3x3 pattern assigned.
What do you mean with orthogonal subset?
Please tell me if you need more information.
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