(;
AB[qq][rq][oq][op][pp][no][qo][mo][lp][kp][qn][js][jr][jq]
AW[qp][rp][pq][mq][mr][ms][kr][ks][lr]
C[White to make a 2nd eye.

Analysis:
    Myron Souris];
W[or]
C[White seems to make a 2nd eye immediately.
What's so hard about this problem?!];
B[os]
C[But this tesuji makes White's 2nd eye very difficult!]
(;
W[pr]
C[The only move.];
B[qr]
(;
W[ns]
C[Forced];
B[nq];W[nr]
C[Again forced.];
B[ps]
(;
W[rs]
C[A marvelous tesuji!  By leaving the 2 Black stones on the bottom edge, White can catch Black in a shortage of liberties.]
(;
B[sr];W[rr];B[sq];W[sp]
C[Black cannot wriggle away from White capturing the 2 bottom stones with atari.];
B[ro];W[qs];B[so];W[ps]
C[White makes the 2nd eye!]
)
    (;
    B[ro]
    (;
    W[qs];B[ps];W[sr]
    C[One last tesuji uses Black's shortage of liberties to make the 2nd eye.];
    B[sp];W[rr]
    C[Finally White makes the 2nd eye!]
    )
        (;
        W[rr]
        C[Also works.];
        B[sq];W[sr];B[sp];W[qs]
        )
        (;
        W[sr]
        C[Also works.]
        (;
        B[sq]
        (;
        W[qs];B[ps];W[os];B[sp];W[rr]
        )
            (;
            W[rr];B[sp];W[qs]
            )
        )
            (;
            B[sp];W[qs];B[ps];W[rr]
            )
        )
    )
)
    (;
    W[qs]
    C[Capturing immediately doesn't work!];
    B[ps]
    C[Black now has time for the throw-in to eliminate White's last chance for a 2nd eye.]
    (;
    W[sr];B[rs]
    C[White's chance for a 2nd eye are gone.]
    (;
    W[os];B[ro];W[qs];B[sp]
    )
        (;
        W[sq];B[ro];W[sp];B[so];W[os];B[rr]
        )
        (;
        W[rr];B[ro];W[sp];B[so]
        )
    )
        (;
        W[rs];B[rr]
        C[And because White cannot capture the 4 Black corner stones, White cannot make a 2nd eye.];
        W[sr]
        C[For example ...];
        B[ss];W[rs];B[ro];W[sp];B[so]
        )
        (;
        W[os];B[ro]
        C[White has no chance for a 2nd eye.]
        )
    )
)
    (;
    W[ps]
    C[Fails];
    B[nr]
    C[Black once again makes a false eye on the bottom edge.];
    W[ns];B[nq]
    )
)
    (;
    W[ps]
    C[Fails];
    B[pr];W[ns];B[nq]
    C[White cannot make an eye on the point from the captured Black stone.];
    W[qr];B[pq];W[rr];B[sr]
    C[And White runs out of room to make the 2nd eye in the corner.]
    )
)

