Middle game exercise 4

   
[Diagram]

A ko

From gogameguru's excellent commentary of Lee Sedol vs Chen Yaoye in the 2013 Samsung Cup.

Black has just played the ko at B1.

  • Should White give in and answer at a ?
  • or play a local ko threat at b?
  • or play a global threat at c or d?

This is a copy of the living page "Middle game exercise 4" at Sensei's Library.
(OC) 2016 the Authors, published under the OpenContent License V1.0.
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