L19 Go Problem Championship: Round 12

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Kirby
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L19 Go Problem Championship: Round 12

Post by Kirby »

Welcome to Round 12 of the L19 Go Problem Championship.

All problems are black to play. As usual, provide your solutions either via hide tags, or direct private message to me.

Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------
$$ | X O . O X . .
$$ | X . X X X O .
$$ | . . O O O O .
$$ | O O . , . . .
$$ | . . . . . . .[/go]
Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X . . . . . . . . |
$$ | . O X . . . . . . . . . . |
$$ | . X Q Q . . , . . , O . . |
$$ | . X X Q . . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . .
$$ | . . X X X X . . . . .
$$ | . X . O O . X . . . .
$$ | . X O X O . O X . , .
$$ | . X . . . . . X . . .
$$ | . X O . . O O X . X .
$$ | . O . . . . . . . . .
$$ ----------------------[/go]
Have fun! :salute:
be immersed
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EdLee
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Post by EdLee »

Click Here To Show Diagram Code
[go]$$B Life
$$ -------------------
$$ | X O . O X . . . .
$$ | X 1 X X X O . O .
$$ | . . O O O O . . .
$$ | O O O , . . . . .
$$ | . . . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | X O 1 O X . . . .
$$ | X 2 X X X O . O .
$$ | . 3 O O O O . . .
$$ | O O O , . . . . .
$$ | . . . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$B Connect-and-die
$$ ------------------
$$ | X . X . X . . . .
$$ | X 4 X X X O . O .
$$ | . X O O O O . . .
$$ | O O O , . . . . .
$$ | . . . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | X 5 X . X . . . .
$$ | X . X X X O . O .
$$ | 6 X O O O O . . .
$$ | O O O , . . . . .
$$ | . . . . . . . . .[/go]
:study:

:study:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . . . .
$$ | . . X X X X . . . . .
$$ | . X . O O . X . . . .
$$ | . X O X O . O X . , .
$$ | . X . 1 . . . X . . .
$$ | . X O . . O O X . X .
$$ | . O . . . . . . . . .
$$ -----------------------[/go]
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fractic
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Re: L19 Go Problem Championship: Round 12

Post by fractic »

I'm not sure you can even capture the marked stones in problem 2.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 8 X . . . . . . . . |
$$ | . O X . 2 3 . . . . . . . |
$$ | . X Q Q 1 6 7 . . , O . . |
$$ | . X X Q 4 5 . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X . . . . . . . . |
$$ | . O X . 2 3 . . . . . . . |
$$ | . X Q Q 1 5 . . . , O . . |
$$ | . X X Q 4 8 . . . X X O . |
$$ | . X O X X 6 . . . . . O . |
$$ | . O O X 7 . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 5 X 7 . . . . . . . |
$$ | . O X 4 2 6 8 . . . . . . |
$$ | . X Q Q 1 . . . . , O . . |
$$ | . X X Q 3 . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X 7 . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 3 X . . . . . . . . |
$$ | . O X . 2 4 . . . . . . . |
$$ | . X Q Q . . . . . , O . . |
$$ | . X X Q 1 . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
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Cassandra
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Re: L19 Go Problem Championship: Round 12

Post by Cassandra »

@ fractic:
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 3 X . . . . . . . . |
$$ | . O X . 2 . . . . . . . . |
$$ | . X Q Q 1 . . . . , O . . |
$$ | . X X Q . . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Did you ever consider Black's resistance with 3 here ?

The solution sequence will become longish ;-)
The really most difficult Go problem ever: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)
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fractic
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Re: L19 Go Problem Championship: Round 12

Post by fractic »

@ Cassandra
I did consider that move. I just didn't read out the ladder correctly.
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Kirby
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Re: L19 Go Problem Championship: Round 12

Post by Kirby »

@EdLee:
If white resists?
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X . . . . . . . . |
$$ | . O X . 2 . . . . . . . . |
$$ | . X O O 1 . . . . , O . . |
$$ | . X X O . . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
be immersed
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Schachus
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Re: L19 Go Problem Championship: Round 12

Post by Schachus »

After some break, I decided to have a look at this again:
Kirby wrote:Welcome to Round 12 of the L19 Go Problem Championship.

All problems are black to play. As usual, provide your solutions either via hide tags, or direct private message to me.

Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------
$$ | X O . O X . .
$$ | X . X X X O .
$$ | . . O O O O .
$$ | O O . , . . .
$$ | . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------
$$ | X O . O X . .
$$ | X 1 X X X O .
$$ | . . O O O O .
$$ | O O . , . . .
$$ | . . . . . . .[/go]
nothing much to say...
Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X . . . . . . . . |
$$ | . O X . . . . . . . . . . |
$$ | . X Q Q . . , . . , O . . |
$$ | . X X Q . . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
seems like a one way street:
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 3 X . . . . . . . . |
$$ | . O X 7 2 . . . . . . . . |
$$ | . X Q Q 1 6 9 . . , O . . |
$$ | . X X Q 4 5 . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
(8 connects at 1) and the ladder works:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . 6 8 X X X . . |
$$ | . O X X X 2 5 7 9 . . . . |
$$ | . O X X O 1 3 4 . . . . . |
$$ | . X O O O O X . . , O . . |
$$ | . X X O O X . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
and another continuation(how do 1 get more than 9 moves in one diagram??):
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . X X X X X . . |
$$ | . O X X X X O O O 2 3 . . |
$$ | . O X X O O O X 1 4 5 . . |
$$ | . X O O O O X 9 8 6 O 7 . |
$$ | . X X O O X . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
there is 3 more moves, but I think you can see the ladder works from here :)
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Kirby
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Re: L19 Go Problem Championship: Round 12

Post by Kirby »

@Schachus
You've got it!
be immersed
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hyperpape
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Re: L19 Go Problem Championship: Round 12

Post by hyperpape »

Problem 1
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------
$$ | X O . O X . .
$$ | X 1 X X X O .
$$ | . . O O O O .
$$ | O O . , . . .
$$ | . . . . . . .[/go]
Problem 2
This is a bit harder.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X . . . . . . . . |
$$ | . O X . 2 3 . . . . . . . |
$$ | . X Q Q 1 5 , . . , O . . |
$$ | . X X Q 4 . . . . X X O . |
$$ | . X O X X 6 . . . . . O . |
$$ | . O O X 7 8 , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$Wc Shenanigans!
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X 2 . . . . . . . |
$$ | . O X . W X . . . . . . . |
$$ | . X Q Q X X , . . 7 O . . |
$$ | . X X Q W 1 . . 5 X X O . |
$$ | . X O X X W . 3 4 6 . O . |
$$ | . O O X X W , X O O 8 . . |
$$ | . . O X X X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bc hopefully good enough for B?
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X . . . . . . . . |
$$ | . O X 5 2 3 . . . . . . . |
$$ | . X Q Q 1 . , . . , O . . |
$$ | . X X Q 4 6 . 7 . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
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gamesorry
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Re: L19 Go Problem Championship: Round 12

Post by gamesorry »

1.
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------
$$ | X O . O X . .
$$ | X 1 X X X O .
$$ | . . O O O O .
$$ | O O . , . . .
$$ | . . . . . . .[/go]
2.
B3 is the key move
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 3 X . . . . . . . . |
$$ | . O X . 2 . . . . . . . . |
$$ | . X Q Q 1 6 , . . , O . . |
$$ | . X X Q 4 5 . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . 9 a X X X . . |
$$ | . O X X X 5 8 0 b d e . . |
$$ | . O X 1 O 4 6 7 c f g . . |
$$ | . X Q Q 2 O 3 k j h O i . |
$$ | . X X Q O X o n l X X O . |
$$ | . X O X X . . . m . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
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Kirby
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Re: L19 Go Problem Championship: Round 12

Post by Kirby »

@hyperpape:
Click Here To Show Diagram Code
[go]$$Bc hopefully good enough for B?
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X . X . . . . . . . . |
$$ | . O X 5 2 3 . . . . . . . |
$$ | . X Q Q 1 . , . . , O . . |
$$ | . X X Q 4 6 . 7 . X X O . |
$$ | 8 X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Maybe consider an alternate move for :b3:?
be immersed
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Kirby
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Re: L19 Go Problem Championship: Round 12

Post by Kirby »

@gamesorry:
Yep.
be immersed
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hyperpape
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Re: L19 Go Problem Championship: Round 12

Post by hyperpape »

Wow, what a case of tunnel vision. When I plan the first move, I know the issue is reducing White's liberties, but I got so caught up in proving White can't escape that I forgot it.

Anyway, I still can't see an answer. I'll have to keep looking.
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 5 X . . . . . . . . |
$$ | . O X 4 2 6 . . . . . . . |
$$ | . X Q Q 1 . , . . , O . . |
$$ | . X X Q 3 . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 4 X . . . . . . . . |
$$ | . O X . 2 . . . . . . . . |
$$ | . X Q Q 1 3 , . . , O . . |
$$ | . X X Q . . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
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Kirby
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Re: L19 Go Problem Championship: Round 12

Post by Kirby »

@hyperpape:

Hint: (look if you want it)
After :w2:, this weak point is pretty annoying - it keeps posing a problem...
Click Here To Show Diagram Code
[go]$$
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X C X . . . . . . . . |
$$ | . O X . 2 . . . . . . . . |
$$ | . X O O 1 . , . . , O . . |
$$ | . X X O . . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
be immersed
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jeromie
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Re: L19 Go Problem Championship: Round 12

Post by jeromie »

I haven't tried to solve these problems in a while.

Problem 1 (3 points)
This seems so easy I feel like I might be missing something. :-)
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------
$$ | X O . O X . .
$$ | X 1 X X X O .
$$ | . . O O O O .
$$ | O O . , . . .
$$ | . . . . . . .[/go]
Problem 2 (6 points)
This one is fun!
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 3 X . . . . . . . . |
$$ | . O X . 2 . . . . . . . . |
$$ | . X Q Q 1 . , . . , O . . |
$$ | . X X Q . . . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
If white resists, this gets long...
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . , . X X X . . |
$$ | . O X 3 X . . . . . . . . |
$$ | . O X 7 2 . . . . . . . . |
$$ | . X Q Q 1 6 , . . , O . . |
$$ | . X X Q 4 5 . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . 8 0 X X X . . |
$$ | . O X X X 4 7 9 . . . . . |
$$ | . O X X O 3 5 6 . . . . . |
$$ | . X Q Q 1 O 2 . . , O . . |
$$ | . X X Q O X . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . , X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ ---------------------------[/go]
Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------+
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . X 1 X X X . . |
$$ | . O X X X X O O 2 4 5 . . |
$$ | . O X X O O O X 3 6 7 . . |
$$ | . X O O O O X . 0 8 O 9 . |
$$ | . X X O O X . . . X X O . |
$$ | . X O X X . . . . . . O . |
$$ | . O O X . . . X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ +---------------------------+[/go]
Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------+
$$ | . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . . |
$$ | . O . O O . . O X O . . . |
$$ | . . O X . . X X X X X . . |
$$ | . O X X X X O O O O X . . |
$$ | . O X X O O O X X O X . . |
$$ | . X O O O O X 1 O O O X . |
$$ | . X X O O X 5 4 2 X X O . |
$$ | . X O X X . 7 6 3 . . O . |
$$ | . O O X . . . X O O . . . |
$$ | . . O X O X . X X X O . . |
$$ | . . O O X . X . . . O . . |
$$ | . . . . . X . . . . . . . |
$$ +---------------------------+[/go]
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