(;
AB[dd][dj][dp][pp][pj][pd][jp][fp][fo][do][jo][kn][dl][dq][bo][jq][kr][km][jm][in][hn][gn][go][gm]
AW[fq][dn][gp][eq][io][ip][cn][bn][ir][jr][iq][jl][im][hm][gl][fm][fn][fk][hk][ik]
C[Black's response to the marked play?

Source:
    "Masterpieces of Handicap Go"
    Kobayashi Koichi 9P
    Commentary:  Nakayama Noriyuki 5P
    American Go Journal, Vol. 31, No 2, pp. 26-27]
TR[ir]
(;
B[gq]
C[Regrettably, in the game, Black decides to start the attack on the inside.];
W[gr];B[hp];W[er]
C[Black lets White off the hook with an easy life.]
(;
B[jd]
C[And Black then follows up with this move in the wrong direction.];
W[cf]
C[Now White is able to approach here, which leaves Black's 2 left side stones behind enemy territory.  Of course, Black is still ahead, but could have avoid this unnecessary complication.]
)
    (;
    B[dg]
    C[Instead, Black should jump here to strengthen the 2 left center stones.  The territory balance is still hugely in Black's favor, so Black can play simply to avoid leaving weak stones.]
    )
)
    (;
    B[dr]
    C[Instead, descending here puts White on the spot.]
    (;
    W[gr]
    C[White cannot live with this sequence.];
    B[fs];W[hq];B[ho]
    C[The reader can verify that White dies.]
    )
        (;
        W[er]
        C[To avoid the previous variation, White would defend here, but ...];
        B[en];W[em];B[dm];W[eo];B[ep]
        (;
        W[gr]
        C[... after White makes life at the bottom, Black takes the ko 1st to cut off the 3 stones for the entire lower left side.

The game depends on reading this sort of situation carefully.]
        )
            (;
            W[en]
            C[White cannot avoid the ko by connecting here.];
            B[es];W[gr];B[fs]
            C[And the reader can verify that White dies.]
            )
        )
    )
)

