(;
AB[dn][gn][hn][in][go][jo][dp][ep][fp][gp][jp][cq][dq][hq][jq][lq][br][hr][kr]
AW[bo][co][ho][ap][cp][hp][ip][bq][eq][fq][gq][iq][cr][dr][ir][jr]
C[Black plays.

Source:
    Qi Jing Zhong Miao #318, an ancient collection of mostly kyu level life and death problems.
Analysis:
    Myron Souris]
(;
B[er]
C[Correct.  Black captures either the 2 stones on the left or the 6 stones on the right.]
(;
W[fr]
C[Best that White has.]
(;
B[hs]
C[Correct];
W[gs];B[js]
C[Best sequence for both sides.  Black captures the 6 stones, but in gote.]
)
    (;
    B[fs]
    C[Worse.];
    W[es];B[gs];W[hs];B[is];W[js]
    C[Black only has a ko for just White's stones on the right.]
    )
)
    (;
    W[gr]
    C[Inferior.

White saves the stones on the right, but Black captures the 2 stones on the left, which overall is bigger!]
    (;
    B[fs]
    C[Correct];
    W[hs];B[ds];W[js];B[bm]
    C[Both of White's group had to live in gote, while Black seals off the left side in sente.]
    )
        (;
        B[hs]
        C[Now this move fails.];
        W[es];B[js];W[gs]
        )
    )
)
    (;
    B[fs]
    C[Usually a good shape move, but fails here.];
    W[er]
    C[White takes the key point in this position.];
    B[hs];W[gr];B[gs];W[es]
    C[White saves all his stones.]
    )
    (;
    B[gr]
    C[Fails];
    W[fr];B[fs];W[er]
    C[White captures the Black stones.]
    )
)

