I’m not sure if this is against the “don’t submit more than two koans at once” rule, but I’ll break some symmetry.
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An attempt at psychological analysis: our Zen master did not use the possibly more natural wording
The rule works for all board sizes.
Since the board sizes allowed in the tool are 5×5, 7×7, and 9×9, I suspect that the rule only applies to odd board sizes.
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Koans 211, 213 and 228 are very interesting. All other koans have a very clear pattern “Black is more north than White”.
Koans 211 and 213 both have a black stone two intersections north of a white stone, but 211 is green and 213 is Red.
Koans 228 is pretty similar to 224, yet 224 is green and 228 is Red.
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Some observations:
- We have not yet shown that white stones matter.
- “Black occupies the upper 4-4 points” works as a rule but it would be kind of boring and especially weird on 5x5.
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Rule guess: there is a black stone in the strict top-right quadrant (excluding the central lines).
(could also be the "polite triangle", which I might guess next depending on how the counter-examples come up, if this guess fails)
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The polite triangle it is! I hope it wasn’t too easy.
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So, do I get to host the next one? Let me think about the rule, and I’ll post some koans to get us started in a bit.
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You might want to ask @martin3141. He declared his interest in hosting another game before I started this one.
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So the real reason was that it only works for square boards, right?
For other rectangular boards, one could still find the center - which might not be
a grid intersection - and draw segments from that to a board-edge and a corner.
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It’s not really the same, though, since it wouldn’t be possible to play some openings “politely”. Because of the lack of symmetry you might need to declare a whole quadrant “polite”.
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no no, please go ahead. Afterall I hosted the first game since the pause.
And to clarify, I’m very interested to keep this going, because I’m having a lot of fun (as player and as master). But I don’t really care whether I host or somebody else 
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