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topazg
Tengen
Posts: 4511 Joined: Wed Apr 21, 2010 3:08 amRank: NebulousGD Posts: 918KGS: topazgLocation: Chatteris, UKHas thanked: 1579 times Been thanked: 650 times
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by topazg Tue Aug 17, 2010 2:19 pm
How about?
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1
Bill Spight
Honinbo
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by Bill Spight Tue Aug 17, 2010 11:46 pm
SoDesuNe wrote: Problem 127:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Ko (actually it's bent-four-in-the-corner, right? So this should be dead?).
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Seki.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Dead.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Usually this will be the place to tenuki, as the local temperature has dropped.
$$Wcm1
Click Here To Show Diagram Code [go]$$Wcm1This is normal if White makes the next local play. Either player can make seki or a throw-in ko. (OC, much depends upon the ko threat situation.
)
As a life and death problem, however, this is the main line:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Seki.
After the normal play for B3,
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1White can make an approach ko.
The Adkins Principle:At some point, doesn't thinking have to go on?
SoDesuNe
Gosei
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by SoDesuNe Wed Aug 18, 2010 1:53 am
Yeah, it seems you both have a point here : D
Wildclaw
Dies in gote
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by Wildclaw Wed Aug 18, 2010 2:00 am
SoDesuNe wrote: Problem 2.136
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1This is actually a rather interesting shape.
The strongest white resistance after black 1 is the white placement at A18. Black lives barely by squeezing the two white stones.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1If black makes the mistake of making the following exchange however, the position turns into a ko as black no longer has the liberties needed to squeeze the two white stones as shown above.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1
Cassandra
Lives in sente
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by Cassandra Wed Aug 18, 2010 2:19 am
SoDesuNe wrote: post scriptum:
Problem 3.128:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1
I think this is strange ^^
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1If White fills at
Black 'a' allows two ways to get a second eye.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Also two ways to get two eyes.
Your hidden sequence is not correct.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1 results in Ko.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1$$Bcm7
Click Here To Show Diagram Code [go]$$Bcm7Double-Ko is the correct solution.
EricBackus
Dies with sente
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by EricBackus Sat Aug 21, 2010 11:52 am
Cassandra wrote: SoDesuNe wrote: post scriptum:
Problem 3.128:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1
I think this is strange ^^
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1If White fills at
Black 'a' allows two ways to get a second eye.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Also two ways to get two eyes.
Your hidden sequence is not correct.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1 results in Ko.
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1$$Bcm7
Click Here To Show Diagram Code [go]$$Bcm7Double-Ko is the correct solution.
The double-ko solution does live, but there is also a solution to this problem which doesn't require a double ko. It starts with a different first move:
Problem 3.128:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1Problem 3.128:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1White can't connect, so black lives. I think this is better than double-ko, since double-ko can provide an infinite supply of ko threats to the opponent.
Problem 3.128:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1If white connects in the corner, black captures. Even though this looks like bent-4, and White can try to make it ko, White will fail because black has too many outside liberties. Again, this seems better than double-ko.
Cassandra
Lives in sente
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by Cassandra Sun Aug 22, 2010 12:08 am
@ EricBackus:
The double-ko solution does live, but there is also a solution to this problem which doesn't require a double ko. It starts with a different first move:
Problem 3.128:
$$Bcm1
Click Here To Show Diagram Code [go]$$Bcm1IF Black answers White's first move at the marked spot with 4, the correct sequence ends with Double-Ko. That's what I wanted to show.
Usually Black's answer at the 2-2-point is not shown in the books. This may be due to the "inheritance" of one of the mistakes in Cho Chikun's Encyclopedia (at least the disk version). The sequence there ends with move
and the remark "Ko".
It goes without saying that this mistake had been made by one of the ghostwriters, not by Cho Chikun himself. Perhaps this ghostwriter didn't recognize that Black's group has two outside liberties.
But from the very beginning, the pivotal White move here is not the correct one to start the handling of this standard corner postition.
)
Black 'a' allows two ways to get a second eye.
results in Ko.
and the remark "Ko".