(;
AB[bc][cg][bg][ch][dh][ei][dj][ae]
AW[eh][fh][gh][dg][ef][cf][ce][cd][dc][ic][ie][ig]
TR[ae]
C[White's response to the marked play?

Is the official solution to this problem incorrect?!

Source:
    From Charles Matthews and Seong-June Kim's excellent preview on a book on shape.

Analysis:
    Myron Souris]
(;
W[ad]
C[The official solution says, "White should play here to give fewer points away."

Normally, attaching on the other side would be about 2.5 points worse for White, but in this position ...];
B[bd]
C[... what if Black goes for the corner?!];
W[af]
C[Cutting off Black doesn't help.  For example, ...];
B[be];W[bf];B[cb]
C[This sequence is a disaster for White.  Black lives in sente in the corner!

Maybe the "official solution" missed this resource for Black?]
)
    (;
    W[af]
    C[The official solution says, "This is the wrong order, though it works."

But given the previous variation, this may actually be best more order here, because Black can no longer live in the corner!]
    (;
    B[bf]
    C[The best that Black has seems to be to simply to capture the White stone.];
    W[ad];B[be];W[bd]
    C[Black captures a stone in sente, but White keeps the corner.]
    )
        (;
        B[bd]
        C[An overplay.  Now Black cannot live in the corner.];
        W[be]
        (;
        B[ad];W[bf];B[cb];W[ab];B[db];W[eb]
        C[Black dies.]
        )
            (;
            B[cb]
            C[Expanding eye space here doesn't work.]
            (;
            W[ab]
            C[White keeps Black to 1 eye.];
            B[db];W[eb];B[da];W[ba];B[fb];W[fc];B[ea];W[ec];B[gb];W[ib]
            C[Black has nowhere to run and no way to make a 2nd eye at the top.]
            )
                (;
                W[db]
                C[Fails];
                B[ab];W[ba];B[ad];W[bf];B[ca]
                )
            )
        )
    )
)

