Life In 19x19

I took a look at the 7x7 go board and the link https://senseis.xmp.net/?7x7BestPlay
I undestood that the ideal komi is 9.

After the sequence

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ | . . 6 2 3 . . |
$$ | . . 4 1 . . . |
$$ | . . . 5 . . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------[/go]

I do not see how black can reach the score +9

I tried

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 1 . . |
$$ | . . O O X . . |
$$ | . . O X . . . |
$$ | . . . X . . . |
$$ | . 2 . . . . . |
$$ | . . . . . . . |
$$ -----------------[/go]

but I didn't manage to reach +9 with black.

Who can help me?

Maybe there is a better way for black to play in the beginning, if the komi is 9.

You might find this thread interesting:

viewtopic.php?f=18&t=17413

Kirby wrote:You might find this thread interesting:

viewtopic.php?f=18&t=17413

Thank you Kirby.
The 7x7 game is not easy at all but at least your link help me a lot.

I understood that in area scoring the perfect komi is 9 points and in territory scoring it is 8 points.

With this in mind do you know if the following sequence is correct for both black and white?

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 6 . . |
$$ | . . . 4 3 7 . |
$$ | . . 5 1 2 . . |
$$ | . . . . 8 . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------[/go]

Gérard TAILLE wrote:I understood that in area scoring the perfect komi is 9 points and in territory scoring it is 8 points.

With this in mind do you know if the following sequence is correct for both black and white?

$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 6 . . |
$$ | . . . 4 3 7 . |
$$ | . . 5 1 2 . . |
$$ | . . . . 8 . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 6 . . |
$$ | . . . 4 3 7 . |
$$ | . . 5 1 2 . . |
$$ | . . . . 8 . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------[/go]

I believe the sequence is not correct for white because of

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . 6 . . . . . |
$$ | . 5 4 2 O 3 . |
$$ | . . 1 O X X . |
$$ | . . X X O . . |
$$ | . . . . O . . |
$$ | . . . . 7 . . |
$$ | . . . . . . . |
$$ -----------------[/go]

and white appears in great difficulty (but I am not sure )

Can someone share guides or tutorials on the game?

Gérard TAILLE wrote:

Gérard TAILLE wrote:I understood that in area scoring the perfect komi is 9 points and in territory scoring it is 8 points.

With this in mind do you know if the following sequence is correct for both black and white?

$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 6 . . |
$$ | . . . 4 3 7 . |
$$ | . . 5 1 2 . . |
$$ | . . . . 8 . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 6 . . |
$$ | . . . 4 3 7 . |
$$ | . . 5 1 2 . . |
$$ | . . . . 8 . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------[/go]

I believe the sequence is not correct for white because of

$$B
$$ -----------------
$$ | . 6 . . . . . |
$$ | . 5 4 2 O 3 . |
$$ | . . 1 O X X . |
$$ | . . X X O . . |
$$ | . . . . O . . |
$$ | . . . . 7 . . |
$$ | . . . . . . . |
$$ -----------------

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . 6 . . . . . |
$$ | . 5 4 2 O 3 . |
$$ | . . 1 O X X . |
$$ | . . X X O . . |
$$ | . . . . O . . |
$$ | . . . . 7 . . |
$$ | . . . . . . . |
$$ -----------------[/go]

and white appears in great difficulty (but I am not sure )

According to Crazy Stone, White 6 is a mistake in your first diagram (should be at 7), and Black 7 is indeed a winning move in the second diagram.

Edit: My program generated a small opening book. You can browse it at https://www.crazy-sensei.com/book/go_7x7/

Rémi wrote:

Gérard TAILLE wrote:

Gérard TAILLE wrote:I understood that in area scoring the perfect komi is 9 points and in territory scoring it is 8 points.

With this in mind do you know if the following sequence is correct for both black and white?

$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 6 . . |
$$ | . . . 4 3 7 . |
$$ | . . 5 1 2 . . |
$$ | . . . . 8 . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . 6 . . |
$$ | . . . 4 3 7 . |
$$ | . . 5 1 2 . . |
$$ | . . . . 8 . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------[/go]

I believe the sequence is not correct for white because of

$$B
$$ -----------------
$$ | . 6 . . . . . |
$$ | . 5 4 2 O 3 . |
$$ | . . 1 O X X . |
$$ | . . X X O . . |
$$ | . . . . O . . |
$$ | . . . . 7 . . |
$$ | . . . . . . . |
$$ -----------------

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . 6 . . . . . |
$$ | . 5 4 2 O 3 . |
$$ | . . 1 O X X . |
$$ | . . X X O . . |
$$ | . . . . O . . |
$$ | . . . . 7 . . |
$$ | . . . . . . . |
$$ -----------------[/go]

and white appears in great difficulty (but I am not sure )

According to Crazy Stone, White 6 is a mistake in your first diagram (should be at 7), and Black 7 is indeed a winning move in the second diagram.

Edit: My program generated a small opening book. You can browse it at https://www.crazy-sensei.com/book/go_7x7/

Rémi, what rules did you use to generate these openings? It seems you use area scoring because I see some mistakes for territory scoring.
If it is the case do you have an opening book with territory scoring?

Gérard TAILLE wrote:Rémi, what rules did you use to generate these openings? It seems you use area scoring because I see some mistakes for territory scoring.
If it is the case do you have an opening book with territory scoring?

This book uses Chinese rules. I don't have a Japanese book. I am too busy to generate one at the moment, but I'll post it here if I make one later.

Rémi wrote:

Gérard TAILLE wrote:Rémi, what rules did you use to generate these openings? It seems you use area scoring because I see some mistakes for territory scoring.
If it is the case do you have an opening book with territory scoring?

This book uses Chinese rules. I don't have a Japanese book. I am too busy to generate one at the moment, but I'll post it here if I make one later.

I understand Remy.

BTW this 7x7 problem shows that japonese rules implies more accuracy than chinese rule because the score under chinese rule goes by two points (typically 1, 3, 5 ... points if no seki) but in japonese rule it goes by one point.

Click Here To Show Diagram Code

[go]$$B
$$ -----------------
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ | . . . b 3 . . |
$$ | . . . 1 2 . . |
$$ | . . . a . . . |
$$ | . . . . . . . |
$$ | . . . . . . . |
$$ -----------------[/go]

If my analyse is correct "a" and "b" allows to end the game with 9 points score in area scoring but only "a" allows to get 8 points in territory scoring.