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Beginner Exercise 18 Solution
Difficulty: Beginner
Keywords: Problem
Analysis
If White is allowed to capture simply at
Since White a will atari the
Solution
For Black so save himself, Black must not allow White to play both
Scartol: Should I leave these so that actual beginners can have a crack at them?
Okay, it looks like the best black can do is get a ko. White has to fight it; white connecting at A only leads to black life at B. Would it work better if black goes at B?
This was my initial response, but I realized (after I posted it -- stupid!) that white can connect after capturing the marked stone, and black is left with a dead shape once he captures the white stones.
Leads to bulky five and black dies. -Xelloss
This is the vital point I think. Once Black moves here, White can't play at 'a' because of a Black snapback, and can't play at 'b' because it's lacking a liberty. Black can form two eyes and live by playing at 1.
Black can respond with 1. Once Black moves to 1, if White tries to move to 'a', Black can capture White's stones by playing above at 'b'. If White chooses to respond at 'b' instead and capture the marked stone, Black can snapback and capture White.
If White plays at 'b' instead, Black can respond at 1, forcing White to capture at 2, then Black can play at 3. White is missing the liberty needed to capture Black. When Black plays at 3, White will have no choice but to use the move as sente. Black doesn't need to play there unless White tries to play at 'a' or 'b', in which case Black can simply capture the group of White stones.
unkx80: After
The reason is because if
Now W can close ko, making B take a. If B takes over ko, he lives. In other case, W closes ko, B plays a. If then W takes c, B extends to the right, and if W doesn't play c, white can take it, close it and live
unkx80: What happens after
Here, the twisted four lives.
unkx80: Thanks to the kamikaze of
After
unkx80:
This is a copy of the living page "Beginner Exercise 18 Solution" at Sensei's Library. ![]() |