(;
AB[hr][ir][bq][gq][kq][mq][cp][dp][gp][kp][pp][bo][eo][ho][io][jo][en][dl]
AW[er][jr][cq][dq][iq][jq][ep][fp][hp][ip][fo][go][cn][qn]
C[White plays.

Source:
    Tesuji Dictionary, Vol. 1, #62,
    Segoe Kensaku & Go Seigen, Ishi Press]
(;
W[gr]
C[Correct.
A beautiful tesuji.];
B[fr]
C[Forced];
W[gs];
B[fs];
W[fq];
B[hs]
(;
W[gr]
C[The throw-in changes the liberty
advantage to White.];
B[hq];
W[js]
C[And White wins the semeai by one move.]
)
    (;
    W[hq]
    C[If White plays here...];
    B[gr];
    W[js];
    B[kr]
    LB[is:a]
    C[And now White cannot put Black into
atari with a play at A.]
    )
)
    (;
    W[fq]
    C[If White tries to reduce Black's liberty
count this way...];
    B[gr]
    C[Black has this resource to stay ahead
in the liberty race.]
    )
)
