As with many similar short rulesets, this one does not define the concept of "seki" (mutual life) either. This is because it's not necessary: The concept of mutual life is just a side-effect of the rules and does not need to be mentioned explicitly.
At the dead stone removal stage both players have to agree which groups are alive and which are dead. If one of the players claims a group of his opponent is dead and his opponent disagrees, he must capture that group explicitly (he can do so freely because of the pass-stones additional rule).
If he is unable to capture the opponent group (or refuses to do so), then that group is simply alive. In the case of seki, both involved groups are in this situation (neither player can demonstrably capture the other group) and thus both groups are alive.
Although it's important to understand the concept of mutual life, this kind of information belongs to a Go tutorial (or rule commentary) and it's not necessary to explicitly mention this in the rules.
Because of the generic nature of the ruleset, where sekis are not handled in any special way, eyes in sekis do give points to the players as any other surrounded territory does. There are only quite few cases where this changes the score difference compared to the Japanese rules, but that should not be all that important.
The bent-four-in-the-corner case is not handled in any special way by this ruleset (as it isn't in most other rulesets) because it's not necessary either.
In order to understand how this ruleset (and many other similar rulesets) handles the bent-four-in-the-corner situations, here is a clarifying explanation:
If such a situation is left to be decided at the dead stone removal stage, there are basically two possibilities:
This is simply the case when there are no unremovable ko-threats on the board and the owner of the bent-4 group agrees with this.
By rule 14 the owner of the group gets to play first (although in this case it usually doesn't really matter; usually he will just pass). Then one of the following four things can happen:
Thus it is possible for a bent-four-in-the-corner group to be alive if the opponent refuses to capture it explicitly when requested.
(There are, of course, even more complicated
bent-four-in-the-corner situation, but there shouldn't be any problem
with them regarding this ruleset.)
© Copyright 2004 Juha Nieminen