(;
AB[ls][ks][fs][qr][kr][ir][hr][gr][qq][lq][kq][pp][jp][ip][hp][po][mo][on][mn][jn][in][fn][en][cn][lm][km][hm][gm]
AW[ms][pr][mr][lr][fr][er][pq][mq][hq][gq][np][mp][lp][kp][gp][ep][cp][ko][jo][go][kn][gn]
C[White plays.

Source:
    Tesuji Dictionary, Vol. 1, Hasami-tsuke #30

Analysis:
    Myron Souris]
(;
W[js]
C[The best move!  White threatens to cut off and capture the 5 stones.];
B[iq];W[jr]
C[An important forcing move.]
(;
B[hn]
C[Black has no choice but to save the bulk of his bottom group.];
W[jq]
C[But White captures 5 stones and lives.]
)
    (;
    B[jq]
    C[Black cannot hold onto all his stones.];
    W[io]
    C[White cuts off the bottom group.];
    B[is];W[gs]
    C[And Black will lose the semeai at the bottom for all his stones.]
    )
)
    (;
    W[io]
    C[Cutting off Black's group is a mistake.];
    B[js]
    C[Black takes the vital point.  Now White no longer has the mainline sequence to capture the 5 stones.  Furthermore, with Black's group alive, White has to live in gote.];
    W[]
    C[If White foolishly plays elsewhere, ...];
    B[ho]
    C[... Black cuts and White is left with the famously dead "door" group on the right.];
    W[op];B[ps]
    )
)

