(;
AB[hr][mr][nr][gq][lq][mq][dp][jp][go][lo][hm][km][hl][il][kl][ml]
AW[ir][kr][or][iq][nq][pq][ip][np][io][no][in][im][mm][nm]
C[White plays.

Source:
     Tesuji Dictionary, Vol.1, Ch.7, Segoe Kensaku & Go Seigen]
(;
W[lp]
C[A truly magnificent probe/sacrifice that exposes the thinness of Black's position.  Incredibly, no other move works.]
(;
B[kp]
C[After this atari, White's chances look dim, but ...];
W[kn]
C[... this nice placement tesuji does the trick.];
B[ln]
(;
W[mp]
LB[ko:A][kq:B]
C[The cuts at A and B are miai for White.]
)
    (;
    W[ko]
    C[Also works.];
    B[mp];W[lm]
    C[And White wins the semeai.  Black's inside group cannot even make 1 eye.]
    )
)
    (;
    B[mp]
    C[If Black tries to connect on the right ...];
    W[ln]
    C[... then White has this nice clamp tesuji.]
    (;
    B[kp];W[ko]
    C[You can easily verify that White cuts off the stones, and wins the semeai.  Note that Black's lower group cannot even make 1 eye.]
    )
        (;
        B[kn];W[ko];B[jo];W[mo];B[kp];W[lo]
        LB[jn:A][kq:B]
        C[White A and B are miai.]
        )
    )
    (;
    B[ko]
    C[Minimizes Black's losses, but ...];
    W[mp];B[jq];W[kq]
    C[... White captures the 4 stones to remain connected.]
    )
)
    (;
    W[kn]
    C[Bad timing, but still interesting.];
    B[ln]
    (;
    W[ko]
    C[White's best try.];
    B[lm];W[kp];B[lp]
    C[Black connects and reduces a crucial internal White liberty.  Now the only question is:  can White make 2 eyes?]
    (;
    W[jm]
    C[White expands his eye-space, but ...];
    B[kq];W[jq];B[jo];W[jn];B[js];W[is];B[ks];W[ls];B[lr]
    C[... White has only 1 eye.]
    )
        (;
        W[kq];B[js]
        C[Again, White has only 1 eye.]
        )
        (;
        W[js];B[jq];W[kq];B[jm]
        C[White cannot find a 2nd eye to uh, well, save his life.]
        )
    )
        (;
        W[lm]
        C[Also fails.];
        B[jn]
        C[Black captures the cutting stone, and White is out of tesujis to connect out.]
        )
    )
)

