This problem is directly from the book without any additional variations than the ones there listed, so if you have any beef, best take it up with Bozulich, but too much beef from strong players and I'll disable it. I just thought it was a fun tesuji/shape play. :)
(;AB[pb]AB[pd]AB[qe]AB[pf]AB[of]AB[ng]AB[nd]AB[qg]AB[qh]AW[qf]AW[rf]AW[re]AW[rd]AW[qc]AW[qb]AW[og]AW[pg]AW[pi]TR[qg]TR[qh]C[What is the best way for Black to save his marked stones?]AP[goproblems]
(;B[oi];W[ph];B[pj];W[qi];B[qj];W[ri]LB[oj:A]LB[nh:B]C[Failure #2 -- White has captured the cutting stones and can aim at either A or B])
(;B[ph];W[oh];B[oi];W[nh];B[pj];W[ni];B[oj];W[mg]C[I quote from the book: Failure #1 -- 'Immediately cutting through ... is not good. Black captures only one stone, so his position is not as thick as it was in [variation of the correct diagram where Black captures].'])
(;B[pj]
(;W[qi];B[ph];W[oh];B[oi];W[nh];B[ri]C[Variation of the correct answer -- 'If White blocks at 2 ..., Black will cut through with 3 and 5, then capture two white stones in a ladder with 7. Black ends up with a very thick position facing the bottom.'RIGHT])
(;W[oi];B[qi];W[oj];B[pk]C['White's strongest response is to make a bamboo joint with 2. This lets Black link up with 3. White strengthens his stones by exchanging 4 for 5, but this move also strengthens Black's stones.'RIGHT])))