Xuanxuan Qijing Problem 297 / Attempts
Solution
![[Diagram]](../../diagrams/4/4946d314ea7c8f120c9da313d71987d0.png)
Solution
Black can't save
.
(Later) Actually a ko with
at r
Failure
![[Diagram]](../../diagrams/22/d080a7a08da78939a61b709399305887.png)
(
can also be at other marked spot)
For other
, White just starts taking away Black's liberties.
unkx80: I never seen this
before. But I think after
, Black can get at least a ko. Can Black do better?
char: I can't find anything better than a ko.
unkx80: Actually, this
is the main line. I think the whole main line solution is about 30 moves long; how many amateurs can read this long without using a go board as an aid?
char: Let's open the can of variations =)
Double Threat
Since the two ladders are parallel, theoretically any white stone between them breaks both ladder.
However, playing a white stone at d or further doesn't work (the diagram on the right).
Double Ladder Breaker 'a'
Double threat, again.
is not the only move; there are several other working moves.
Double Ladder Breaker 'b'
After
, there are two ladders, starting with x and y.
White can once again try to break both ladder by playing at
or r, but it won't work.
Double Ladder Breaker 'c'