(;
AB[bd][cd][dd][ee][df][cf][bg][bh][di][ae][ed]
AW[bc][cc][dc][fc][fd][fe][ff][ef][dg][ch][ci][bi][cj][be][bf][ce]
C[Black plays.

Source:
    A position from a recent game at the St. Louis Go Club.];
B[ah]
C[At first glance, Black's descent here seems to make an easy life.]
(;
W[af]
(;
B[ad];W[cg];B[de];W[ai];B[ag]
C[Black captures 4 stones and under normal circumstances would be alive.  But ...];
W[bf]
C[... White has this throw-in that seems to destroy the eye-shape, but ...];
B[be]
C[... Black returns the favor of giving up 4 stones!];
W[af];B[bg]
C[Black lives!

The "under-the-stones" capture theme occurs 3 times, all in the same general board real estate:
Black captures 4 stones, then
White captures 4 stones, then
Black captures 2 stones to form the 2nd eye!]
)
    (;
    B[de]
    C[Fails];
    W[ad];B[ag];W[ac];B[ae];W[be]
    C[Now White is the one unleashing an under-the-stones refutation.];
    B[bf]
    C[White has a ko and takes 1st.]
    )
)
    (;
    W[cg]
    C[Unsatisfactory.];
    B[de]
    C[Black lives outright.]
    )
)

