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 Post subject: Game Review 20190117
Post #1 Posted: Thu Jan 17, 2019 10:59 pm 
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I lost a game (as black) and won some learning opportunities that way:

Problem 1: Blacks best play?
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . X . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . O . . O . . . . . . . . . . |
$$ | . . O . . O . X . . . . . . . . . . . |
$$ | . O X X X O . . . O . . . . . . . . . |
$$ | . O X . X O . X . . . . . . . . . . . |
$$ | . . X . . X X X O . . . . . . . X . . |
$$ | . O O X . X O X O , . . . . . , . . . |
$$ | . . . X . X O O X . . . . . W . O . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . O X . . O O . . . . . . X X O . . |
$$ | . . O . . . O X . O . . . . X O O . . |
$$ | . . . . . . . X . . . . . . . . . O . |
$$ | . . . O O O . . . O . . . . . X X X . |
$$ | . . O X O X X . . . . . . X . X O . . |
$$ | . . X X X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


Problem 2: Black to move (and the correct continuation)?
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . X . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . O . . O . . . . . . . X . . |
$$ | . . O . . O . X X O . . . . . . . . . |
$$ | . O X X X O . . . O . . . . O . O . . |
$$ | . O X . X O . X O . . . . . . . . . . |
$$ | . . X . . X X X O . O . . . X . X O . |
$$ | . O O X . X O X O , X . X . O , . . . |
$$ | . . . X . X O O X X . . . X O . O . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . O X . . O O X . . . . . X X O . . |
$$ | . . O . . . O X . O . . . . X O O . . |
$$ | . . . . . . . X . . . . . . . . . O . |
$$ | . . . O O O O X . O . . . . . X X X . |
$$ | . . O X O X X W . . . . . X . X O . . |
$$ | . . X X X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


and exploring a variation:
Problem 3: Blacks optimal play?
(Hint: related to problem 1 somewhat)
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . . X . W . . . . . . . . . . . . . |
$$ | . . O X . . . . . . . . . . . . . . . |
$$ | . . O . X O . . . . . . . . . . . . . |
$$ | . . . O X . O . . , . . . . . , . . . |
$$ | . . . . X X O . . . . . . . . . . . . |
$$ | . . . X . O X . . . . . . . . . . . . |
$$ | . . X . . O . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O O O X . . , . . . . . X . . . |
$$ | . . O X O X X . . . . . . . . . . . . |
$$ | . . X X X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


This post by Gomoto was liked by: Elom
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 Post subject: Re: Game Review 20190117
Post #2 Posted: Sat Jan 19, 2019 9:25 am 
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Rank: OGS 9kyu
Universal go server handle: WindnWater, Elom
1:
Extending at K9, keeping P11 in reserve (I think it affects all but one of white's groups)

2:
Atari underneath at H2, white J3, then black J6 (C4 and G5 should black some aji to use)

3:
Frying my pea brain so far. F14?

_________________
On Go proverbs:
"A fine Gotation is a diamond in the hand of a dan of wit and a pebble in the hand of a kyu" —Joseph Raux misquoted.


This post by Elom was liked by: Gomoto
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 Post subject: Re: Game Review 20190117
Post #3 Posted: Sat Jan 19, 2019 10:06 am 
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Solution Problem 1:
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . X . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . O . . O . . . . . . . . . . |
$$ | . . O . . O . X . . . . . . . . c . . |
$$ | . O X X X O . . . O . . . . . . . . . |
$$ | . O X . X O . X . . . . . . . . . . . |
$$ | . . X . . X X X O . . . . . b . X . . |
$$ | . O O X . X O X O , . . . . . , . . . |
$$ | . . . X . X O O X . . . . . W . O a . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . O X . . O O . . . . . . X X O . . |
$$ | . . O . . . O X . O . . . . X O O . . |
$$ | . . . . . . . X . . . . . . . . . O . |
$$ | . . . O O O . . . O . . . . . X X X . |
$$ | . . O X O X X . . . . . . X . X O . . |
$$ | . . X X X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


Moves b and c are possible because black has the advantage. But there is a local tactic available at a and this is the most efficient move.

Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . X . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . O . . O . . . . . . . . . . |
$$ | . . O . . O . X . . . . . . . . . . . |
$$ | . O X X X O . . . O . . . . . . . . . |
$$ | . O X . X O . X . . . . . . . . . . . |
$$ | . . X . . X X X O . . . . . . . X . . |
$$ | . O O X . X O X O , . . . . . , 3 2 . |
$$ | . . . X . X O O X . . . . . O 5 O 1 . |
$$ | . . O . . . . . . . . . . . . . . 4 . |
$$ | . . O X . . O O . . . . . . X X O . . |
$$ | . . O . . . O X . O . . . . X O O . . |
$$ | . . . . . . . X . . . . . . . . . O . |
$$ | . . . O O O . . . O . . . . . X X X . |
$$ | . . O X O X X . . . . . . X . X O . . |
$$ | . . X X X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]


White tries a little bit harder, still much better for black.
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . X . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . O . . O . . . . . . . . . . |
$$ | . . O . . O . X . . . . . . . . . . . |
$$ | . O X X X O . . . O . . . . . . . . . |
$$ | . O X . X O . X . . . . . . . . 6 . . |
$$ | . . X . . X X X O . . . . . . . X 4 . |
$$ | . O O X . X O X O , . . . . . , 3 2 . |
$$ | . . . X . X O O X . . . . . O 8 O 1 . |
$$ | . . O . . . . . . . . . . . . 9 7 5 . |
$$ | . . O X . . O O . . . . . . X X O . . |
$$ | . . O . . . O X . O . . . . X O O . . |
$$ | . . . . . . . X . . . . . . . . . O . |
$$ | . . . O O O . . . O . . . . . X X X . |
$$ | . . O X O X X . . . . . . X . X O . . |
$$ | . . X X X . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]

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 Post subject: Re: Game Review 20190117
Post #4 Posted: Sun Jan 20, 2019 3:50 am 
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Solution Problem 2:

Move 3, the empty triangle, is important here (reducing whites liberties).
Click Here To Show Diagram Code
[go]$$
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . X . . . . . |
$$ | . . . O . . . . O , . . . . . X . . . |
$$ | . . . . . O . . O . . . . . . . X . . |
$$ | . . O . . O . X X O . . . . . . . . . |
$$ | . O X X X O . . . O . . . . O . O . . |
$$ | . O X . X O . X O . . . . . . . . . . |
$$ | . . X . . X X X O . O . . . X . X O . |
$$ | . O O X . X O X O , X . X . O , . . . |
$$ | . . . X . X O O X X . . . X O . O . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . . O X . . O O X . . . . . X X O . . |
$$ | . . O . . . O X . O . . . . X O O . . |
$$ | . . . . . . . X . . . . . . . . . O . |
$$ | . . . O O O O X 6 O . . . . . X X X . |
$$ | . . O X O X X O 1 5 . . . X . X O . . |
$$ | . . X X X . 3 2 4 7 . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]

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