Net example 7
jvt I have seen a series of net problems like the one below on a Japanese web site :
Even though it does not prevent White from increasing its number of liberties, prevents White from escaping.
Alex Weldon: Probably worth showing for beginners what happens if White tries to atari her way out. If , expecting Black to connect at
so that she can then escape by playing at
, Black squeezes with
and
. White connects with
at the marked point and Black catches her in a ladder with
,
and
. As a question to stronger players: Is there still a way for Black to capture if this ladder is also no good for Black (some ladder breaker stone that we can't see here)? I don't see it.
Mef: If the ladder is bad for black, I think he can set up a ko with . If white declines to fight the ko, black has a chance to set up a different ladder, which may or may not work depending on where exactly the original ladder breaker is.
(sIG): But suppose an extra white stone is in L 11 (that is, it breaks both ladders), doesn't that make it useless for black to pursue white in the first place? Won't white gain advantage? Does this mean there's a fault in the exercise or do we simply suppose the rest of the board empty?
MrTenuki: Unfortunately, the sequence above doesn't work. Black has weaknesses at a, b, and c. Even if black covers both a and b by playing at b, white can still capture and the marked stones. If black defends at d, white simply breaks out or captures the four stones by playing at b.
idigo: Yeah, but is a mistake by black.
should be at
.
Moved from loose ladder.