(;
AB[ob][kb][qc][oc][jc][qd][md][ld][kd][qe][ne][je][rf][of][nf][mf][og][ng][mg][jg][rh][oh][lh][qi][pi][mi][li][nj][pk]
AW[oa][pb][nb][lb][nc][nd][pe][me][le][pf][lf][pg][lg][ph][mh][oi][ni]
C[Black plays.

Source:
    Igo Hatsuyo-ron #68:  300 year old problem set for
    student professionals.
Analysis:
    Myron Souris]
(;
B[od]
C[Correct.];
W[oe]
(;
B[nh];W[mh]
(;
B[nh];W[mg]
(;
B[oh];W[ng];B[nf];W[og];B[ne]
C[Amazingly, White's audit only shows 1 eye on the books!]
)
    (;
    B[nf]
    C[Also works.];
    W[oh];B[ng];W[og];B[ne]
    C[And White still has only one eye.]
    )
)
    (;
    B[ng]
    C[Fails];
    W[nf];B[mg];W[nh]
    C[And White lives with seki.]
    )
)
    (;
    B[oj]
    C[Fails];
    W[nh]
    C[Now White has better eye shape.];
    B[ng];W[mg]
    C[White lives with territory.]
    )
)
    (;
    B[nh]
    C[Wrong move order.];
    W[pc]
    C[Now White can capture two stones to make a second eye.];
    B[mh];W[od]
    LB[la:a][qb:b]
    C[And White A and B are miai for the second eye.]
    )
    (;
    B[pc]
    C[Fails.  White can no longer form an eye along the top, but this move gives White an extra freedom in the center to play with.];
    W[oe];B[nh]
    C[Otherwise, White captures here to live as in a previous variation.];
    W[mh]
    (;
    B[mg];W[nh];B[ng];W[nf];B[og];W[oh]
    C[White lives with seki.]
    )
        (;
        B[nh];W[mg];B[oh];W[nf];B[og];W[od]
        C[White lives with territory.]
        )
    )
)
