How to Mark a Seki

[yebellz]

Seki stones should be left as alive (i.e., not marked as dead which fades them out). For Japanese rules, any eyes held by stones in seki should also be marked as non-points (which the site shows as small blue squares) by clicking on those points.

@bugcat

japanese rules anti-seki

The Japanese rules have all sorts of complications, and anti-seki is certainly one of them. However, stones that are technically dead under anti-seki are not removed from the board for scoring purposes, so for the sake of scoring anti-sekis properly on this site, those dead stones in anti-seki are also left as alive. Or so, I think, but there are always weird edge cases in the Japanese rules, so maybe someone can find a convoluted example where that’s not even correct.

I’ve written about anti-seki in another thread over several posts starting here:

Odd Cases in the Japanese Rules

Anti-Seki The official commentary gives this position as example where both black and white stones could be considered dead: [antiseki] If both players pass, while leaving the above position on the board, then all of the black stones and the single white stone are considered dead, however, they are NOT removed from the board for scoring. The white stone is considered dead, since it can be captured by a hypothetical move at A. Black is dead, since white can play at B and then A to capture, sin…