(
;
FF[4]
GM[1]
SZ[19]
AP[Jago:Version 4.10]
AB[pq][pk][pd][lc][jp][fq]
AW[dp][dn][ci][dd][jd][qf]
TR[qf]
C[How should Black counter White's kakari with the marked stone?]
LB[qe:a][qd:b][nd:c][qh:d]
(
;
B[qe]
;
W[pf]
LB[nd:a]
TR[lc]
C[Black has to defend at a to protect the corner, and this works inefficiently with the marked stone.]
)
(
;
B[qd]
C[RIGHTThis works best with the marked stone, protecting the corner.]
TR[lc]
)
(
;
B[nd]
TR
LB[rd:a][qc:b][qi:c]
C[The top stones are extremely inefficient. On top of that, White can still slide at a, then when Black responds at b, White can make a solid base at c, nicely breaking up the right side and supplying backup for invasions.]
)
(
;
B[qh]
;
W[qc]
C[White enters the corner, no good.]
)
)