Dual ladder breaker

   

Chinese: 镇神头 (zhèn shén tóu)
Japanese:
Korean:

[Diagram]

Problem

White to play. How to prevent two ladders?

[Diagram]

Ladder 1

This is the first ladder.

[Diagram]

Ladder 2 (8 at 1)

This is the second ladder. If W6 at B7, then B7 at a, and eventually White will still need to capture at W6.

[Diagram]

Solution

The dual ladder breaker is W1.


See also:


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