This 'n' that

[Bill Spight]

There are many possibilities for the ko ensemble.

[Gérard TAILLE]

There are many possibilities for the ko ensemble.

OC Bill, that is the reason why I did not really understand why you proposed such example with a miai value 7½ in the environment.
It was just to help you I took some time to study some environments with 4 gote points in order to reach a higher temperature (11 in my example).

[Bill Spight]

There are many possibilities for the ko ensemble.

OC Bill, that is the reason why I did not really understand why you proposed such example with a miai value 7½ in the environment.
It was just to help you I took some time to study some environments with 4 gote points in order to reach a higher temperature (11 in my example).

I appreciate that, thank you. But remember, my pre-thermography method of ko evaluation basically used an environment of simple gote. That is not my focus, now.

[Gérard TAILLE]

lowing position

$$W
$$ --------------
$$ | X a X O O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .

Click Here To Show Diagram Code

[go]$$W
$$ --------------
$$ | X a X O O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .[/go]

In CGT, with a non-ko environment, a play at b plainly dominates a play at a. And, even though nobody has proved it, AFAIK, experience says that it is dominated in ko environments, as well. A play at a may be correct in some circumstances, but it is still dominated. An amateur SDK who plays it instead of b is, at best, careless. For an amateur dan player I would say that it is a bad play.

$$B black to play
$$ --------------
$$ | X a X . O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .

Click Here To Show Diagram Code

[go]$$B black to play
$$ --------------
$$ | X a X . O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .[/go]

GO is a surprising game. It seems a black move at "b" dominates a black move at "a" in all circumstancies (I mean in a ko or non-ko environment) but it is not the case. It may happen than a black move at "a" is strictly better than a black move at "b". Do you see the point?

[Bill Spight]

lowing position

$$W
$$ --------------
$$ | X a X O O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .

Click Here To Show Diagram Code

[go]$$W
$$ --------------
$$ | X a X O O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .[/go]

In CGT, with a non-ko environment, a play at b plainly dominates a play at a. And, even though nobody has proved it, AFAIK, experience says that it is dominated in ko environments, as well. A play at a may be correct in some circumstances, but it is still dominated. An amateur SDK who plays it instead of b is, at best, careless. For an amateur dan player I would say that it is a bad play.

$$B black to play
$$ --------------
$$ | X a X . O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .

Click Here To Show Diagram Code

[go]$$B black to play
$$ --------------
$$ | X a X . O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .[/go]

GO is a surprising game. It seems a black move at "b" dominates a black move at "a" in all circumstancies (I mean in a ko or non-ko environment) but it is not the case. It may happen than a black move at "a" is strictly better than a black move at "b". Do you see the point?

Very interesting.

I can guess that b has a strict miai that together act as a defensive ko threat.

[Gérard TAILLE]

$$B black to play
$$ --------------
$$ | X a X . O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .

Click Here To Show Diagram Code

[go]$$B black to play
$$ --------------
$$ | X a X . O . .
$$ | X O O O O . .
$$ | X b X X O . .
$$ | X O O O O . .
$$ | X X . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . . . . .
$$ | . . . , . . .[/go]

GO is a surprising game. It seems a black move at "b" dominates a black move at "a" in all circumstancies (I mean in a ko or non-ko environment) but it is not the case. It may happen than a black move at "a" is strictly better than a black move at "b". Do you see the point?

Very interesting.

I can guess that b has a strict miai that together act as a defensive ko threat.

Not in the circumstances I found, but that does not mean that you cannot find a position where your idea applies.