Tsumegos from real games

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jlt
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Re: Tsumegos from real games

Post by jlt »

Tsumego #3: a tesuji problem. White to play and get a good result. What are the next few moves?

That kind of position is beyond my reading horizon in a real game, even though it was a slow game on a physical board.
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X . . . . . . . . . . . . O . . |
$$ | . . O O X X . . . . . . . . . O X . . |
$$ | . . . O O X . X X O . . . . . . O . . |
$$ | . . . . X W W W W X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . X . . X . . . . . . . . . . |
$$ | . . O X . X O . . , . . . X O O . . . |
$$ | . . O . X O . . X . . . . X O X O O . |
$$ | . . . . . . . . . . . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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jlt
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Re: Tsumegos from real games

Post by jlt »

Tsumego #4. Black to play and capture some stones.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . X O . . O . X O . . . . O X . . . . |
$$ | . X X O . X O O . O . . . O X X X . . |
$$ | . X O O . . X X O . . . . . . . O . . |
$$ | . . X X O O . . O O . . . . X X O . . |
$$ | . . . . X O X X . X O . . . . O . . . |
$$ | . . . X X X O X . X . . . . . . . . . |
$$ | . . X . . O O . . . . . . . . . . . . |
$$ | . . O O . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . O . . . . . . . . . . . . . . X . . |
$$ | . X O O . . . . . . X . . . . . . . . |
$$ | . . X O . . . . . , . . . . . , . . . |
$$ | . . X O X . . . X . O . . O . X . . . |
$$ | . O O X . X . . . . . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
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Kirby
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Re: Tsumegos from real games

Post by Kirby »

jlt wrote:Tsumego #3: a tesuji problem. White to play and get a good result. What are the next few moves?

That kind of position is beyond my reading horizon in a real game, even though it was a slow game on a physical board.
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X . . . . . . . . . . . . O . . |
$$ | . . O O X X . . . . . . . . . O X . . |
$$ | . . . O O X . X X O . . . . . . O . . |
$$ | . . . . X W W W W X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . X . . X . . . . . . . . . . |
$$ | . . O X . X O . . , . . . X O O . . . |
$$ | . . O . X O . . X . . . . X O X O O . |
$$ | . . . . . . . . . . . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
If black goes along and blocks after you push:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X . . . . . . . . . . . . O . . |
$$ | . . O O X X 2 . . . . . . . . O X . . |
$$ | . . . O O X 1 X X O . . . . . . O . . |
$$ | . . . . X W W W W X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . X . . X . . . . . . . . . . |
$$ | . . O X . X O . . , . . . X O O . . . |
$$ | . . O . X O . . X . . . . X O X O O . |
$$ | . . . . . . . . . . . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Then there are some interesting options:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X 5 . . 3 4 . . . . . . . O . . |
$$ | . . O O X X X 1 2 . . . . . . O X . . |
$$ | . . . O O X O X X O . . . . . . O . . |
$$ | . . . . X O O O O X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . X . . X . . . . . . . . . . |
$$ | . . O X . X O . . , . . . X O O . . . |
$$ | . . O . X O . . X . . . . X O X O O . |
$$ | . . . . . . . . . . . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
or:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X 5 . 4 3 . . . . . . . . O . . |
$$ | . . O O X X X 1 2 . . . . . . O X . . |
$$ | . . . O O X O X X O . . . . . . O . . |
$$ | . . . . X O O O O X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . X . . X . . . . . . . . . . |
$$ | . . O X . X O . . , . . . X O O . . . |
$$ | . . O . X O . . X . . . . X O X O O . |
$$ | . . . . . . . . . . . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
but the last diagram is not perfect, because if black gives up a few stones, the "important" ones are still in danger:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X 5 . 4 3 6 . . . . . . . O . . |
$$ | . . O O X X X 1 2 . . . . . . O X . . |
$$ | . . . O O X O X X O . . . . . . O . . |
$$ | . . . . X O O O O X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . X . . X . . . . . . . . . . |
$$ | . . O X . X O . . , . . . X O O . . . |
$$ | . . O . X O . . X . . . . X O X O O . |
$$ | . . . . . . . . . . . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
It's also possible that black doesn't answer the way you'd expect with the initial push. Maybe something weird, I dunno - it's not totally clear to me:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X . . 2 . . . . . . . . . O . . |
$$ | . . O O X X . . . . . . . . . O X . . |
$$ | . . . O O X 1 X X O . . . . . . O . . |
$$ | . . . . X O O O O X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . X . . X . . . . . . . . . . |
$$ | . . O X . X O . . , . . . X O O . . . |
$$ | . . O . X O . . X . . . . X O X O O . |
$$ | . . . . . . . . . . . . . . X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
be immersed
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Kirby
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Re: Tsumegos from real games

Post by Kirby »

jlt wrote:Tsumego #4. Black to play and capture some stones.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . . . . . . . . . . . . . . . . |
$$ | . X O . . O . X O . . . . O X . . . . |
$$ | . X X O . X O O . O . . . O X X X . . |
$$ | . X O O . . X X O . . . . . . . O . . |
$$ | . . X X O O . . O O . . . . X X O . . |
$$ | . . . . X O X X . X O . . . . O . . . |
$$ | . . . X X X O X . X . . . . . . . . . |
$$ | . . X . . O O . . . . . . . . . . . . |
$$ | . . O O . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . O . . . . . . . . . . . . . . X . . |
$$ | . X O O . . . . . . X . . . . . . . . |
$$ | . . X O . . . . . , . . . . . , . . . |
$$ | . . X O X . . . X . O . . O . X . . . |
$$ | . O O X . X . . . . . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
One possible option:
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O . 5 4 . 8 . . . . . . . . . . . |
$$ | . X O 9 3 O 1 X O . . . . O X . . . . |
$$ | . X X O 6 X O O 2 O . . . O X X X . . |
$$ | . X O O . 7 X X O . . . . . . . O . . |
$$ | . . X X O O . . O O . . . . X X O . . |
$$ | . . . . X O X X . X O . . . . O . . . |
$$ | . . . X X X O X . X . . . . . . . . . |
$$ | . . X . . O O . . . . . . . . . . . . |
$$ | . . O O . . . . . , . . . . . , O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . O . . . . . . . . . . . . . . X . . |
$$ | . X O O . . . . . . X . . . . . . . . |
$$ | . . X O . . . . . , . . . . . , . . . |
$$ | . . X O X . . . X . O . . O . X . . . |
$$ | . O O X . X . . . . . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
be immersed
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xela
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Re: Tsumegos from real games

Post by xela »

Tsumego 3, I'm thinking along similar lines to Kirby:
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X b O . X . . . . . X . X X . . |
$$ | . . O X . . 9 . . , . . . . . O . . . |
$$ | . . O X a . 6 5 7 . . . . . . . O . . |
$$ | . . O O X X 2 3 4 8 . . . . . O X . . |
$$ | . . . O O X 1 X X O . . . . . . O . . |
$$ | . . . . X W W W W X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |[/go]
:b6: and friends are down to two liberties. The points a and b are miai, so I think black can't escape being captured. But I don't think of this as tesuji, white is playing fairly blunt moves. Or have I missed something better?
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Re: Tsumegos from real games

Post by xela »

Tsumego 4, minor detail of move order:
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . b 9 . . . . . . . . . . . . . |
$$ | . . W . 5 4 0 8 . . . . . . . . . . . |
$$ | . X W a 3 O 1 X O . . . . O X . . . . |
$$ | . X X O 6 X O O 2 O . . . O X X X . . |
$$ | . X O O . 7 X X O . . . . . . . O . . |
$$ | . . X X O O . . O O . . . . X X O . . |
$$ | . . . . X O X X . X O . . . . O . . . |
$$ | . . . X X X O X . X . . . . . . . . . |
$$ | . . X . . O O . . . . . . . . . . . . |[/go]
:b11: at a. If black omits :b9:, then white can play b and save the :wc: stones.
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Re: Tsumegos from real games

Post by jlt »

Re: tsumego 3. Here is Katago's analysis.

Suppose first that White pushes, Black blocks and White cuts.
Click Here To Show Diagram Code
[go]$$Wc The four black stones are captured
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X . . 7 5 6 . . . . . . . O . . |
$$ | . . O O X X 2 3 4 . . . . . . O X . . |
$$ | . . . O O X 1 X X O . . . . . . O . . |
$$ | . . . . X W W W W X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |[/go]
(White shouldn't play :w7: at E15, otherwise Black sacrifices three stones and plays :b8: at :w7:.)

If Black protects the four stones with :b6:, then other stones are caught in a ladder.
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . 6 . . . , . . . . . O . . . |
$$ | . . O X . . . 5 . . . . . . . . O . . |
$$ | . . O O X X 2 3 4 7 . . . . . O X . . |
$$ | . . . O O X 1 X X O . . . . . . O . . |
$$ | . . . . X W W W W X . . . . . . . . . |
$$ | . . . . X . . . . . . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |[/go]
However, before blocking, Black may want to make the exchange K14-L13 first, in which case the above variations don't work anymore, so White has to play :w5: differently. Black has to extend at :b6: otherwise the preceding variations work again, and then :w7: captures the cutting stone K12 in a ladder.
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O X X . . . . . . . . . . . . . |
$$ | . . O X . O . X . . . . . X . X X . . |
$$ | . . O X . . . . . , . . . . . O . . . |
$$ | . . O X . . . . . 6 . . . . . . O . . |
$$ | . . O O X X 4 . . 2 5 . . . . O X . . |
$$ | . . . O O X 1 X X O 3 . . . . . O . . |
$$ | . . . . X W W W W X . . . . . . . . . |
$$ | . . . . X . . . . 7 . . . . . . . . . |
$$ | . . . , . X . . . , . . . . . , . . . |[/go]
xela wrote: But I don't think of this as tesuji, white is playing fairly blunt moves.
I know these moves are blunt, but because my reading is too shallow, I couldn't see that a succession of 7 blunt moves actually works. That's one of the reasons why I am a kyu player...
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Re: Tsumegos from real games

Post by jlt »

Tsumego 4, analysis by Katago:
Suppose White cuts with :w6: as in Kirby's and xela's posts, then White loses somes stones but ends in sente: after :w10:, Black needs to play "a".
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . 9 8 . . . . . . . . . . . . . |
$$ | . . O . 5 4 . 0 . . . . . . . . . . . |
$$ | . X O a 3 O 1 X O . . . . O X . . . . |
$$ | . X X O 6 X O O 2 O . . . O X X X . . |
$$ | . X O O . 7 X X O . . . . . . . O . . |
$$ | . . X X O O . . O O . . . . X X O . . |
$$ | . . . . X O X X . X O . . . . O . . . |
$$ | . . . X X X O X . X . . . . . . . . . |
$$ | . . X . . O O . . . . . . . . . . . . |[/go]
So White won't bother cutting at :w6: and plays as follows:
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . 7 6 . . . . . . . . . . . . . |
$$ | . . O . 5 4 . 8 . . . . . . . . . . . |
$$ | . X O . 3 O 1 X O . . . . O X . . . . |
$$ | . X X O . X O O 2 O . . . O X X X . . |
$$ | . X O O 9 . X X O . . . . . . . O . . |
$$ | . . X X O O . . O O . . . . X X O . . |
$$ | . . . . X O X X . X O . . . . O . . . |
$$ | . . . X X X O X . X . . . . . . . . . |
$$ | . . X . . O O . . . . . . . . . . . . |[/go]
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Re: Tsumegos from real games

Post by jlt »

Tsumego #5: An easy one but I didn't take the trouble to read it during the game.

White to play. Assume White is alive. What is the status of the black group?
Click Here To Show Diagram Code
[go]$$Wc
$$ ----------------
$$ O O X . . . . . |
$$ O X X X X . . . |
$$ O O O O O X X X |
$$ . O O . O O O O |[/go]
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EricBackus
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Re: Tsumegos from real games

Post by EricBackus »

jlt wrote:Tsumego #5: An easy one but I didn't take the trouble to read it during the game.

White to play. Assume White is alive. What is the status of the black group?
Click Here To Show Diagram Code
[go]$$Wc
$$ ----------------
$$ O O X . . . . . |
$$ O X X X X . . . |
$$ O O O O O X X X |
$$ . O O . O O O O |[/go]
I think: Black is alive, but white can make a gote seki.
Click Here To Show Diagram Code
[go]$$Wc This attack fails
$$ ----------------
$$ O O X . . 1 2 5 |
$$ O X X X X 4 3 6 |
$$ O O O O O X X X |
$$ . O O . O O O O |[/go]
Click Here To Show Diagram Code
[go]$$Wc Gote seki
$$ ----------------
$$ O O X . 5 2 1 . |
$$ O X X X X 4 . 3 |
$$ O O O O O X X X |
$$ . O O . O O O O |[/go]
Black could alternatively make this a ko, but this is unlikely to be better than seki.
Click Here To Show Diagram Code
[go]$$Wc Ko, white takes first
$$ ----------------
$$ O O X . 3 4 1 . |
$$ O X X X X . 2 . |
$$ O O O O O X X X |
$$ . O O . O O O O |[/go]
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Re: Tsumegos from real games

Post by jlt »

Tsumego #6: Black to play. Can Black kill a group?
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . O . . . . . . . . . . . |
$$ | . O X . . O O . O X . X X O X O O . . |
$$ | . O X O O O X O O X . . O X . X O . . |
$$ | O X O O X X X X X , . . . X X X . O . |
$$ | . X X X . . . . . . X . O . . . X O O |
$$ | . X . . X . O O O . X O . . . . X O X |
$$ | . . X O . O . X O X O . . O O X . X . |
$$ | . X O . . . O X O X . O O . O O X . X |
$$ | . X O . O . O O X X . X O O X X X X O |
$$ | X O O X O X . . . , . X O X . X . O . |
$$ | . X . O O X . O . . . . X . X X . O . |
$$ | . . . O X X . . . . X X X X O O O . . |
$$ | . X O O . . . X . X X O O O O X . . . |
$$ | . X O X . . . . O X O . . . O X O O . |
$$ | . X O X . X . X X O . . O X . X X X . |
$$ | . X X O . . X . O , O . O X . , . . . |
$$ | . . X O . O X . X O . O X O . X . . . |
$$ | . O O . O . O X X X O O X X . . . . . |
$$ | . . . . . . O . O O . . . . . . . . . |
$$ ---------------------------------------[/go]
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Re: Tsumegos from real games

Post by Harleqin »

Like this probably:
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . O . . . . . . . . . . . |
$$ | . O X . . O O . O X . X X O X O O . . |
$$ | . O X O O O X O O X . . O X . X O . . |
$$ | O X O O X X X X X , . . . X X X . O . |
$$ | . X X X . . . . . . X . O . . . X O O |
$$ | . X . . X . O O O . X O 3 a . . X O X |
$$ | . . X O . O . X O X O 1 . O O X . X . |
$$ | . X O . . . O X O X 2 O O . O O X . X |
$$ | . X O . O . O O X X . X O O X X X X O |
$$ | X O O X O X . . . , . X O X . X . O . |
$$ | . X . O O X . O . . . . X . X X . O . |
$$ | . . . O X X . . . . X X X X O O O . . |
$$ | . X O O . . . X . X X O O O O X . . . |
$$ | . X O X . . . . O X O . . . O X O O . |
$$ | . X O X . X . X X O . . O X . X X X . |
$$ | . X X O . . X . O , O . O X . , . . . |
$$ | . . X O . O X . X O . O X O . X . . . |
$$ | . O O . O . O X X X O O X X . . . . . |
$$ | . . . . . . O . O O . . . . . . . . . |
$$ ---------------------------------------[/go]
If 2 captures, 3 at a.
A good system naturally covers all corner cases without further effort.
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Re: Tsumegos from real games

Post by jlt »

It seems that this is the correct :b1:, but White can play :w2: differently and get a ko.
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Re: Tsumegos from real games

Post by Harleqin »

Oh.
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . O . . . . . . . . . . . |
$$ | . O X . . O O . O X . X X O X O O . . |
$$ | . O X O O O X O O X . . O X . X O . . |
$$ | O X O O X X X X X , . . . X X X . O . |
$$ | . X X X . . . . . . X 7 O 2 . . X O O |
$$ | . X . . X . O O O . X O . 4 3 . X O X |
$$ | . . X O . O . X O X O 1 6 O O X . X . |
$$ | . X O . . . O X O X 5 O O . O O X . X |
$$ | . X O . O . O O X X . X O O X X X X O |
$$ | X O O X O X . . . , . X O X . X . O . |
$$ | . X . O O X . O . . . . X . X X . O . |
$$ | . . . O X X . . . . X X X X O O O . . |
$$ | . X O O . . . X . X X O O O O X . . . |
$$ | . X O X . . . . O X O . . . O X O O . |
$$ | . X O X . X . X X O . . O X . X X X . |
$$ | . X X O . . X . O , O . O X . , . . . |
$$ | . . X O . O X . X O . O X O . X . . . |
$$ | . O O . O . O X X X O O X X . . . . . |
$$ | . . . . . . O . O O . . . . . . . . . |
$$ ---------------------------------------[/go]
A good system naturally covers all corner cases without further effort.
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Re: Tsumegos from real games

Post by jlt »

This one should be easy.

Problem #7: White to play and win the capturing race.
Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . X . X X . X . . |
$$ | . . . X . . . . X O O O X X X X O O . |
$$ | . . O . . X . . X X . O X O O X O . . |
$$ | . . . O . . . . . , X O X O X X O . . |
$$ | . . . . . . . . . . X O O O O X X O . |
$$ | . . O . . . . . . . . O X X . O X O . |
$$ | . . . . . . . . . . X O . O O O X O . |
$$ | . . . . . . . . . . X O O O X X X O . |
$$ | . . . . . . . . . . X O X X X X O O . |
$$ | . . . X . . . . O O X O X O . X O O X |
$$ | . . . X O . . . O X . X O . O X O X . |
$$ | . . X O . O O O X X . . . . . X X X . |
$$ | . . X O . X X O X O . O O O O O O O . |
$$ | . . X O . . . X X O . . X X X X O . . |
$$ | . X O O O X . X . O X . . X . X O . . |
$$ | . X O , O X . . . O . . O X X O . . . |
$$ | . . X O O O X X X O . X O X O O . . . |
$$ | . X . X . O X . X O X . X . X O . . . |
$$ | . . X . . . . . X O . . . X O O . . . |
$$ ---------------------------------------[/go]
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