I wrote:
You could also introduce Herman's idea of double button go, where the last pass is also a button, so that it does not matter who makes the last pass.

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Edit: Double button go, I should mention, is used with
territory scoring. I was quoting a post that I accidentally clobbered, in which that is made clear. The double button concept allows players to play life and death out without problems using territory scoring instead of area scoring. Thanks, Herman!

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Actually, the double button implements nicely. There are two buttons, one in which Black only gives a pass stone and one in which White only gives a pass stone. In terms of the count, they cancel out. We simply require the first player to pass to take the button where he gives a pass stone. Here is how it works.
Each player gives a pass stone when passing, except if the same player makes the first and last pass. In that case she does not give a pass stone when making the last pass. For example, suppose that the territory score difference is 7 pts. in favor of Black, and White gets the last dame. Then Black passes, handing over a pass stone and then White passes, handing over a pass stone. Each player has taken a button, although that is not obvious. The result remains the same. Similarly, suppose that the territory score difference is 6 pts. with Black getting the last dame. Then White passes, handing over a pass stone and then Black passes, handing over a pass stone. The result remains the same.
Now suppose that we have a situation where White takes a 1 pt. ko but Black has no ko threat and no dame to play, and she passes, handing over a pass stone. Then White fills the ko and Black passes again, handing over a pass stone. Then White passes, handing over a pass stone. White gains an extra point, unlike current Japanese rules, but as both Honinbo Shusai and Go Seigen thought was right.
Hmmm. It's not so easy to get the same player to make the first and last pass, is it?

How about an attempted pass fight? Black passes, handing over a pass stone. Then White plays a threat that Black must answer. After Black answers, White passes, handing over a pass stone. Then Black passes, but since he passed first, does not hand over a pass stone. White gains nothing from the attempted pass fight.
