Chapter When liberties count, Section Gaining Liberties, Problem 1, page 73. This is the book solution.
LukeNine45: Something like this. and are interchangeable. White can trade a for b before playing but to no avail. White loses by one liberty.
Dave: Careful! If Black carelessly answers with , White has an indirect ko after . Black can not play at a. The right answer to is to throw in at 8 first and then play 7.