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parallel ladders
Difficulty: Beginner
Keywords: Tesuji, Tactics
Here White has a choice of parallel ladders. Because the marked black stone breaks just one of them, White must be careful. White 3 and 5 are the correct way.[2] Now Black's stones can't escape.
White 3 here is a mistake, from the point of view of capturing Black.
Later on in the ladder Black 2 makes it impossible for White to continue. Bearing driving in mind
Moving the marked black stone closer along the diagonal does change things, White might then want to play 1, 3 and 5 here instead: a driving tesuji.[2] It all depends on the direction of play whether capturing Black on the left, or blighting[1] Black's stone on the right, is bigger.
Calling either ladder correct is questionable, when the net at W 3 snags the Black stones, too. If Black tries to escape, say with B 4, W can play atari. Note that the net works even if there is a Black stone on the circled point. -- Bill
Charles OK then, perhaps the final version of the lesson needs an extra stone, such as the square-marked one.
It is painfully easy to miss a knight's move net like White 3 in a real game (White 3 at a fails much more obviously). Up to Black 10 Black looks to be well set to escape.
Urgh - the paper is too small to contain the rest of the sequence ... Black at a is about to be strong. A better version of the original diagram would therefore deprive the marked white stone of further liberties. This is a copy of the living page "parallel ladders" at Sensei's Library. ![]() |