(;
AB[dd][jd][pd][qd][oe][of][pf][dj][pj][dp][pp]
AW[md][od][pe][qe][qf][pg]
C[After White's attach-and-extend joseki, what is Black's response to White's push(1) and cut(2)?

Source:
    "What's Wrong With That Move", Nakayama Noriyuki 7P
    American Go Journal, Vol. 35, No. 4, pp. 47-49.]
LB[pe:1][od:2]
(;
B[rd]
C[50 years ago, this descent was considered a joseki.  The problem is that ...];
W[qh]
C[... after protecting here, White is quite safe on the right side.];
B[nd]
TR[od]
C[Next, Black hoped to capture the marked stone with good aji, but ...];
W[oc];B[nc];W[ob];B[nb];W[ne]
C[... White's cut is clever.  White uses the marked stones.]
TR[ob][oc][od];
B[nf]
C[Black needs to force here first, and then ...];
W[me];B[pb]
C[... capture the 3 stones.];
W[mg]
C[However, this covering move feels good for White.  Anytime later, White can fill the outside liberties with 3 forcing moves.  White is thick.

This result used to be called a joseki.  But Black's top right territory is just 15 points.  And now this old joseki is considered inadequate for Black.]
)
    (;
    B[qg]
    C[The correct answer is Black's cut here.]
    (;
    W[rd]
    C[White will probably follow up with this hane sequence.];
    B[rc];W[re];B[oc];W[qh];B[nd]
    C[This result is really good for Black.  Each side has "captured" a stone, but Black's stone still has a lot of aji.  E.g., Black A, White B, Black C is painful for White.]
    LB[ri:A][rh:B][oh:C]
    )
        (;
        W[rg]
        C[This hane is even worse for White.];
        B[qh];W[rh];B[qi];W[rd];B[rc];W[re];B[oc];W[nd];B[sf]
        C[White's stones die.];
        W[ri];B[rj]
        TR[pj]
        C[The marked stone is in a perfect position.]
        )
    )
)

