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 Post subject: Re: Moonlight life and go rules
Post #81 Posted: Fri Jul 23, 2021 9:56 am 
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Gérard TAILLE wrote:
Bill Spight wrote:
Gérard TAILLE wrote:
Another example of very common seki:
Click Here To Show Diagram Code
[go]$$W 0 point in japonese rule and 1 point in Spight rule
$$ --------------------
$$ | O . O . X O . . . .
$$ | X O O . X O . . . .
$$ | X X X X X O . . . .
$$ | O O O O O O . . . .
$$ | . . . . . . . . . .
$$ | . . . . . . . . . .
$$[/go]


As you mentionned it very clearly yourself, Spight rule is not japonese rule. My view is that the difference concerns essentially sekis with one point difference in some very common cases.
OC it is not a problem Bill just a comparaison for a better understanding. :)


Basically, Spight rules with territory scoring implement Berlekamp's No Pass Go with Prisoner Return, with a superko rule. Except for the superko rule, it is consistent with the oldest extant game records for which the scores are known, which are territory scores with a group tax. The main difference with modern Japanese scoring is the group tax. Modern Japanese scoring of sekis is also quirky. The SpightJapaneseStyle rules are irrelevant. Why do you keep referring to them?


Yes Bill, I my last post I mentionned only "Spight rule" and not "japonese Spight rule" but may be I was not clear enough.


Because you did not correct the link to the Spight Japanese Style rules, which rules you commented on earlier. That's not simply not being clear.

Bill Spight wrote:
How do you see the shown mannenko position remaining on the board, so that White gets 1 net point in the encore?

Because connecting the ko is a one-sided dame and with encore, any one-sided dame allows to gain one point. Am I wrong?[/quote]

You are the only person I know of who calls that point a one-sided dame. ;)

Under Spight territory rules it is possible to show whether White can claim 1 point in the encore. You are welcome to prove your claim. :)

Gérard TAILLE wrote:
If it is true (?) then
Click Here To Show Diagram Code
[go]$$W Japonese rule 0, Spight rule +2
$$ ----------------
$$ | . O O X . . .
$$ | X . O X . . .
$$ | X X O X . . .
$$ | . . O X . . .
$$ | O O O X . . .
$$ | X X X X . . .
$$ | . . . . . . .
$$ -------------[/go]

and similarly, assuming no ko fight (I mean no ko threat):

Click Here To Show Diagram Code
[go]$$W Japonese rule +1, Spight rule +3
$$ ----------------
$$ | . O X . O X . .
$$ | O X X . O X . .
$$ | O O O O O X . .
$$ | X X X X X X . .
$$ | . . . . . . . .
$$ | . . . . . . . .
$$ -------------[/go]

2 points difference looks significant and I guess strategy may change if these kind of seki occur.


The latter is 0 by the 1989 Japanese rules, and is the kind of mannenko position that produced the controversial ruling that eventually led to the 1949 Japanese rules.

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Last edited by Bill Spight on Fri Jul 23, 2021 10:14 am, edited 1 time in total.
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 Post subject: Re: Moonlight life and go rules
Post #82 Posted: Fri Jul 23, 2021 10:02 am 
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Bill Spight wrote:
Gérard TAILLE wrote:
Click Here To Show Diagram Code
[go]$$W Japonese rule +1, Spight rule +3
$$ ----------------
$$ | . W X . O X . .
$$ | O X X . O X . .
$$ | O O O O O X . .
$$ | X X X X X X . .
$$ | . . . . . . . .
$$ | . . . . . . . .
$$ -------------[/go]



The latter is 0 by the 1989 Japanese rules, and is the kind of mannenko position that produced the controversial ruling that eventually led to the 1949 Japanese rules.

In 1989 japonese rule the marked white stone is not dead?

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 Post subject: Re: Moonlight life and go rules
Post #83 Posted: Fri Jul 23, 2021 10:16 am 
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Gérard TAILLE wrote:
Bill Spight wrote:
Gérard TAILLE wrote:
Click Here To Show Diagram Code
[go]$$W Japonese rule +1, Spight rule +3
$$ ----------------
$$ | . W X . O X . .
$$ | O X X . O X . .
$$ | O O O O O X . .
$$ | X X X X X X . .
$$ | . . . . . . . .
$$ | . . . . . . . .
$$ -------------[/go]



The latter is 0 by the 1989 Japanese rules, and is the kind of mannenko position that produced the controversial ruling that eventually led to the 1949 Japanese rules.

In 1989 japonese rule the marked white stone is not dead?


It is dead, but the stones are in seki, so it is not removable.

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At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

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 Post subject: Re: Moonlight life and go rules
Post #84 Posted: Fri Jul 23, 2021 10:31 am 
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Bill Spight wrote:
Gérard TAILLE wrote:
Click Here To Show Diagram Code
[go]$$W 0 point in japonese rule and 1 point in Spight rule
$$ --------------------
$$ | O . O . X O . . . .
$$ | X O O . X O . . . .
$$ | X X X X X O . . . .
$$ | O O O O O O . . . .
$$ | . . . . . . . . . .
$$ | . . . . . . . . . .
$$[/go]

You are the only person I know of who calls that point a one-sided dame. ;)

Under Spight territory rules it is possible to show whether White can claim 1 point in the encore. You have not done so.


Let's take Spight rule:
Play stops when the same player passes a second time in the same board position.
With territory scoring play stops twice. After the first stop there is an encore in which a pass costs one point and each player makes the same number of plays (considering a pass a play)

In the position above black cannot avoid :w1: pass :b2: pass :w3: pass
According to Spight rule the play stops (white has passed a second time in the same position)
Now, after this first stop Spight rule (with territory scoring) says an encore begins then it follows:

Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ | O 6 O . X O . . . .
$$ | X O O . X O . . . .
$$ | X X X X X O . . . .
$$ | O O O O O O . . . .
$$ | . . . . . . . . . .
$$ | . . . . . . . . . .
$$[/go]
:b5: pass
:b7: pass
:w8: pass
:b9: pass (now black has passed a second time in the same position
:w10: pass (one more pass because black began the encore)
and white gains one point because black passed three times and white only two times.

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 Post subject: Re: Moonlight life and go rules
Post #85 Posted: Fri Jul 23, 2021 10:40 am 
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Bill Spight wrote:
Gérard TAILLE wrote:
Click Here To Show Diagram Code
[go]$$W Japonese rule +1, Spight rule +3
$$ ----------------
$$ | . W X . O X . .
$$ | O X X . O X . .
$$ | O O O O O X . .
$$ | X X X X X X . .
$$ | . . . . . . . .
$$ | . . . . . . . .
$$ -------------[/go]

It is dead, but the stones are in seki, so it is not removable.

OK Bill but black has simply to take the ko before the end of the game. That way black marks one point doesn't it?
On the contrary, with Spight rule, black will wait till the encore before taking the ko and connect. That is the point.

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 Post subject: Re: Moonlight life and go rules
Post #86 Posted: Fri Jul 23, 2021 10:41 am 
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Gérard TAILLE wrote:
Bill Spight wrote:
Gérard TAILLE wrote:
Click Here To Show Diagram Code
[go]$$W 0 point in japonese rule and 1 point in Spight rule
$$ --------------------
$$ | O . O . X O . . . .
$$ | X O O . X O . . . .
$$ | X X X X X O . . . .
$$ | O O O O O O . . . .
$$ | . . . . . . . . . .
$$ | . . . . . . . . . .
$$[/go]

You are the only person I know of who calls that point a one-sided dame. ;)

Under Spight territory rules it is possible to show whether White can claim 1 point in the encore. You have not done so.


Let's take Spight rule:
Play stops when the same player passes a second time in the same board position.
With territory scoring play stops twice. After the first stop there is an encore in which a pass costs one point and each player makes the same number of plays (considering a pass a play)

In the position above black cannot avoid :w1: pass :b2: pass :w3: pass
According to Spight rule the play stops (white has passed a second time in the same position)
Now, after this first stop Spight rule (with territory scoring) says an encore begins then it follows:

Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ | O 6 O . X O . . . .
$$ | X O O . X O . . . .
$$ | X X X X X O . . . .
$$ | O O O O O O . . . .
$$ | . . . . . . . . . .
$$ | . . . . . . . . . .
$$[/go]
:b5: pass
:b7: pass
:w8: pass
:b9: pass (now black has passed a second time in the same position
:w10: pass (one more pass because black began the encore)
and white gains one point because black passed three times and white only two times.


Very good. :)

The following is also possible.

Click Here To Show Diagram Code
[go]$$W White to play passes
$$ --------------------
$$ | O 2 O . X O . . . .
$$ | X O O . X O . . . .
$$ | X X X X X O . . . .
$$ | O O O O O O . . . .
$$ | . . . . . . . . . .
$$ | . . . . . . . . . .
$$[/go]

:w1:, :w3:, :b4: = pass
Either :w3: or :b4: could stop play. :)

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Visualize whirled peas.

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 Post subject: Re: Moonlight life and go rules
Post #87 Posted: Fri Jul 23, 2021 10:57 am 
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Gérard TAILLE wrote:
Bill Spight wrote:
Gérard TAILLE wrote:
Click Here To Show Diagram Code
[go]$$W Japonese rule +1, Spight rule +3
$$ ----------------
$$ | . W X . O X . .
$$ | O X X . O X . .
$$ | O O O O O X . .
$$ | X X X X X X . .
$$ | . . . . . . . .
$$ | . . . . . . . .
$$ -------------[/go]

It is dead, but the stones are in seki, so it is not removable.

OK Bill but black has simply to take the ko before the end of the game. That way black marks one point doesn't it?


Yes, or reopen the play and take the :wc: stone after White passes. :)

Gérard TAILLE wrote:
On the contrary, with Spight rule, black will wait till the encore before taking the ko and connect. That is the point.

If White has nothing better than to pass after Black takes the ko. :)

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The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

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 Post subject: Re: Moonlight life and go rules
Post #88 Posted: Fri Jul 23, 2021 11:10 am 
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Bill Spight wrote:
If White has nothing better than to pass after Black takes the ko. :)

What do you mean Bill?
In any case, in the encore phase, each side takes all dead stones and each side plays her one-sided dame; finally, taking the dead stones costs nothing while taking a one-sided dame gains one point. The order for making all these moves is generally not significant.

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 Post subject: Re: Moonlight life and go rules
Post #89 Posted: Fri Jul 23, 2021 11:39 am 
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Gérard TAILLE wrote:
Bill Spight wrote:
If White has nothing better than to pass after Black takes the ko. :)

What do you mean Bill?
In any case, in the encore phase, each side takes all dead stones and each side plays her one-sided dame; finally, taking the dead stones costs nothing while taking a one-sided dame gains one point. The order for making all these moves is generally not significant.

Under Spight rules with territory scoring, one sided dame are territory. In the encore playing a one sided dame gains nothing, while passing loses one point.

For example, if this is the encore:

Click Here To Show Diagram Code
[go]$$W White to play
$$ ----------------
$$ | 6 O O X O O 3 |
$$ | X 4 O X O O B |
$$ | X X O X O O 5 |
$$ | . . O X O O O |
$$ | O O O X O O O |
$$ | X X X X X O O |
$$ | . 2 1 8 X O . |
$$ -------------[/go]

:w7:, :w9: - :b12: = pass

None of the board plays gains anything. The five passes each lose one point. Net result: Black 4 - White 3 = +1 for Black. (The group tax applies. :))

As for the order of play being significant, neither side should fill a point of territory before the encore. :)

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— Winona Adkins

Visualize whirled peas.

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 Post subject: Re: Moonlight life and go rules
Post #90 Posted: Fri Jul 23, 2021 2:07 pm 
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Bill Spight wrote:
Under Spight rules with territory scoring, one sided dame are territory.

That is exactly what I meant.

Click Here To Show Diagram Code
[go]$$B
$$ ----------------
$$ | . O O X O O . |
$$ | X . O X O O X |
$$ | X X O X O O . |
$$ | . . O X O O O |
$$ | O O O X O O O |
$$ | X X X X X O O |
$$ | . . . . X O . |
$$ -------------[/go]


In this example you can see 4 points for black (4 points of territory) against 5 points for white (4 points of territory + 1 prisonner). Black has 2 one-sided dames => the result of the encore will be a black win by 1 point.

As far as I am concerned I like Spight rules for its simplicity. It is really a great advantage comparing to the complex japonese rule. Now for a player wanted to play in a pure territory context I imagine she will not like to take into account one-sided dames which looks really an area approach. That's life ;-)

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 Post subject: Re: Moonlight life and go rules
Post #91 Posted: Fri Jul 23, 2021 5:05 pm 
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Gérard TAILLE wrote:
Bill Spight wrote:
Under Spight rules with territory scoring, one sided dame are territory.

That is exactly what I meant.

Click Here To Show Diagram Code
[go]$$B
$$ ----------------
$$ | . O O X O O . |
$$ | X . O X O O X |
$$ | X X O X O O . |
$$ | . . O X O O O |
$$ | O O O X O O O |
$$ | X X X X X O O |
$$ | . . . . X O . |
$$ -------------[/go]


In this example you can see 4 points for black (4 points of territory) against 5 points for white (4 points of territory + 1 prisonner). Black has 2 one-sided dames => the result of the encore will be a black win by 1 point.

Except that under Spight territory rules we can see 2 points for the one way dame in the top left plus 2 points for the group in the bottom left = 4 points for Black minus 3 points for White on the right side.

Gérard TAILLE wrote:
As far as I am concerned I like Spight rules for its simplicity. It is really a great advantage comparing to the complex japonese rule. Now for a player wanted to play in a pure territory context I imagine she will not like to take into account one-sided dames which looks really an area approach. That's life ;-)


Thank you. I am fond of them myself. ;) But I have to admit that they have a group tax. A group tax which applies to the one way dame as well as to the surrounded points and the dead stone elsewhere on the board. If the players do not want to use a group tax, it is easy for them to adjust for it.

----

When I first heard about the Segoe-Takahashi game that eventually led to the Japanese 1949 rules, I thought that the main question was about how to determine life and death. That was the focus of Ing's commentary. Much later I learned that the main focus for the Japanese at that time was whether Black was obliged to take and fill the mannenko, which was the custom, and which the referee told him to do. White, Segoe, was some 30 points ahead and if the game had been played out at temperature -1, he would have easily won. But games were not played out, and there was no concept of temperature -1 or of prisoner return until the advent of CGT, decades later. The main question boiled down to this: Is making a move a right or an obligation?

In No Pass Go it is an obligation. But that does not mean that games are played out to the bitter end. Below temperature 0 games have scores and the result may be calculated without having to play the game out. Thus, combinatorial games have a natural stopping point at or below temperature 0 when the players can agree to a final net score. The fact that Japanese games ended by agreement, even when I learned the game in the late 1960s, makes me think that Japanese Go descended from a form of No Pass Go. :)

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At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.

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 Post subject: Re: Moonlight life and go rules
Post #92 Posted: Sat Jul 24, 2021 2:27 am 
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Bill Spight wrote:
Gérard TAILLE wrote:
Bill Spight wrote:
Under Spight rules with territory scoring, one sided dame are territory.

That is exactly what I meant.

Click Here To Show Diagram Code
[go]$$B
$$ ----------------
$$ | . O O X O O . |
$$ | X . O X O O X |
$$ | X X O X O O . |
$$ | . . O X O O O |
$$ | O O O X O O O |
$$ | X X X X X O O |
$$ | . . . . X O . |
$$ -------------[/go]


In this example you can see 4 points for black (4 points of territory) against 5 points for white (4 points of territory + 1 prisonner). Black has 2 one-sided dames => the result of the encore will be a black win by 1 point.

Except that under Spight territory rules we can see 2 points for the one way dame in the top left plus 2 points for the group in the bottom left = 4 points for Black minus 3 points for White on the right side.

Gérard TAILLE wrote:
As far as I am concerned I like Spight rules for its simplicity. It is really a great advantage comparing to the complex japonese rule. Now for a player wanted to play in a pure territory context I imagine she will not like to take into account one-sided dames which looks really an area approach. That's life ;-)


Thank you. I am fond of them myself. ;) But I have to admit that they have a group tax. A group tax which applies to the one way dame as well as to the surrounded points and the dead stone elsewhere on the board. If the players do not want to use a group tax, it is easy for them to adjust for it.

----

When I first heard about the Segoe-Takahashi game that eventually led to the Japanese 1949 rules, I thought that the main question was about how to determine life and death. That was the focus of Ing's commentary. Much later I learned that the main focus for the Japanese at that time was whether Black was obliged to take and fill the mannenko, which was the custom, and which the referee told him to do. White, Segoe, was some 30 points ahead and if the game had been played out at temperature -1, he would have easily won. But games were not played out, and there was no concept of temperature -1 or of prisoner return until the advent of CGT, decades later. The main question boiled down to this: Is making a move a right or an obligation?

In No Pass Go it is an obligation. But that does not mean that games are played out to the bitter end. Below temperature 0 games have scores and the result may be calculated without having to play the game out. Thus, combinatorial games have a natural stopping point at or below temperature 0 when the players can agree to a final net score. The fact that Japanese games ended by agreement, even when I learned the game in the late 1960s, makes me think that Japanese Go descended from a form of No Pass Go. :)


Do you know is some work has been done in the past, in order to try to identify clearly these one-sided dames in order to be able to exclude these points from the count?

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 Post subject: Re: Moonlight life and go rules
Post #93 Posted: Sat Jul 24, 2021 10:45 am 
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Gérard TAILLE wrote:
Do you know is some work has been done in the past, in order to try to identify clearly these one-sided dames in order to be able to exclude these points from the count?


I do not know of any original research into one sided dame, but I expect that they were known well over 1,000 years ago. :)

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 Post subject: Re: Moonlight life and go rules
Post #94 Posted: Sat Jul 24, 2021 4:07 pm 
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Bill Spight wrote:
The fact that Japanese games ended by agreement, even when I learned the game in the late 1960s, makes me think that Japanese Go descended from a form of No Pass Go. :)
Bill, could you clarify what is meant by "ended by agreement"?

In my own games, and those I have watched, an in-person, face-to-face game usually ends in some sort of informal agreement, rather than any formal signalling with passing. One player says something like. "Well, I can't see anything else to do", and the other player responds with "Neither can I. I guess that's it". And so the game ends, and they remove the dead stones and begin counting. This happens whether they are using area scoring or territory scoring.

Or is there something else meant by "ended by agreement", that was done in Japanese games of several decades ago?

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Post #95 Posted: Sat Oct 02, 2021 11:20 am 
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Bill Spight wrote:
Whether the ko can be retaken after pass (in normal play) is not completely clear but may be guessed as passing for a ko (then retake it) is also the basis in hypothetical play.
The Japanese rule are clear. The rules only allow for a stone to be played after another stone. There is no rule allowing for a stone to be played after a pass unless the game has resumed or unless confirming life and death status of a ko.
Bill Spight wrote:
This is not a defintion of resumption and thus the rule seems to me really unclear on that point (I mean retaking a ko immediatly after pass moves), even if I undersatng your guessing.
A ko may only be retaken after a pass in life and death confirmation. While the rules allow for a move to be played after a pass when resuming, they do not allow for retaking a ko that was the last move played (passes are not part of the consideration).
Bill Spight wrote:
What is really the purpose of the resumption? Is it only for resolving some disagreements between the two players on the status of some group of stones, or could it be really a strategic mean to retake a ko by using a pass as a ko threat?
A ko may not be retaken. The only purpose is to resolve disagreements.
Bill Spight wrote:
Hypothetical play is one way of reaching agreement about their status.
Hypothetical play is one way, but it is not the way of the Japanese Rules. The Japanese Rules confirm life and death by the definition of life and death given in the rules, which may be explained in a manner similar to "hypothetical play" but it is certainly very different from play.
Bill Spight wrote:
But it is possible that the life or death of stones depends upon who plays first, and that is why the players do not agree. That is why the player who requests resumption must allow his opponent to play first. Neither player is allowed to benefit from the discussion about hypothetical play. In theory, both players could lose.
Right, the Japanese rules specifically state that both players lose.

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Post #96 Posted: Sat Oct 02, 2021 4:30 pm 
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CDavis7M wrote:
Bill Spight wrote:
Whether the ko can be retaken after pass (in normal play) is not completely clear but may be guessed as passing for a ko (then retake it) is also the basis in hypothetical play.
The Japanese rule are clear. The rules only allow for a stone to be played after another stone. There is no rule allowing for a stone to be played after a pass unless the game has resumed or unless confirming life and death status of a ko.


Are you suggesting that after taking the last ko in the game, I am not allowed to fill it after my opponent has passed ? :o

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Post #97 Posted: Sat Oct 02, 2021 10:13 pm 
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Pio2001 wrote:
CDavis7M wrote:
Bill Spight wrote:
Whether the ko can be retaken after pass (in normal play) is not completely clear but may be guessed as passing for a ko (then retake it) is also the basis in hypothetical play.
The Japanese rule are clear. The rules only allow for a stone to be played after another stone. There is no rule allowing for a stone to be played after a pass unless the game has resumed or unless confirming life and death status of a ko.


Are you suggesting that after taking the last ko in the game, I am not allowed to fill it after my opponent has passed ? :o

:tmbup: It is not allowed in "play" (before 2 passes) but it is allowed in the end of game (after 2 passes).

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