(;
AB[hs][dr][gr][ir][dq][gq][iq][lq][dp][jp][kp][pp][cn]
AW[hr][jr][cq][hq][jq][gp][hp][ip][jo][in][cl]
C[Black plays.

Source:
     Tesuji Dictionary, V.2, Ch.2, #43];
B[is]
(;
W[fq]
(;
B[es]
C[The saving tesuji and the only move.];
W[fr];B[fs]
TR[jq][jr]
C[Black connects his stones and captures the marked stones.]
)
    (;
    B[fr]
    C[Trying to block here is a big mistake.];
    W[js]
    C[Now Black cannot avoid a loss.];
    B[gs];W[er]
    )
)
    (;
    W[js]
    C[The obvious descent doesn't work for White, but this variation is instructive.];
    B[gs];W[fq];B[es]
    TR[dr]
    LB[fs:A][fr:B][er:C]
    C[Now Black saves all his stones and has an extra captured stone on the right.

Note that if the marked stone is just one space to the left, then Black does lose his stones to a liberty shortage after White A, Black B, White C.]
    )
    (;
    W[er]
    LB[eq:A][fr:B]
    C[A trick move.  Black has multiple refutations that you have for homework, but Black A or B are big mistakes!]
    )
)

