(;
AB[pa][oa][na][ma][la][sb][pb][ob][nb][hb][rc][kc][ic][rd][qd][kd][oe][ne][le][qf]
AW[qa][ka][rb][mb][lb][jb][qc][oc][nc][mc]
C[Black plays.

Source:
    Igo Hatsuyo-ron #69:  300 year old problem set for
    student professionals.
Analysis:
    Myron Souris]
(;
B[kb]
C[Correct];
W[ja];B[pc];W[pd];B[qb];W[qc];B[pb];W[qb];B[ob]
(;
W[od]
C[Maybe White's best try.];
B[la];W[sc]
(;
B[sa]
C[Black avoids the trap and denies White an eye in the corner.];
W[oa];B[ma]
C[And White has a dead shape.]
)
    (;
    B[sd]
    C[Fails.];
    W[sa]
    C[White has a ko, and a billion internal ko threats.  For example...];
    B[ra];W[pe];B[pf];W[qe];B[re];W[rf]
    )
)
    (;
    W[la];B[pc]
    C[Black captures something and White dies.]
    )
    (;
    W[nb];B[la];W[ma];B[oa]
    C[White has only 1 eye.]
    )
)
    (;
    B[pc]
    C[Fails:  incorrect move order.];
    W[pd];B[qb];W[qc];B[pb];W[qb];B[ob]
    LB[kb:a]
    C[Black no longer has the sente play at A.];
    W[nb];B[na];W[kb]
    C[And White lives.]
    )
)

