(;
GM[1]
SZ[19]
AW[fc][ic][kd][nd][nc]
AB[dd][df][id][oc][pd][pf]
LB[ic:2][id:1]
C[Problem 48. Black to play.  

White attaches at 2, aiming to make sabaki. How should Black respond ? ]
;B[hc]
TE[2]
C[Correct Answer.  

Black should block at 1. ]
;W[hd]
C[White then crosscuts with 2, the usual way of making sabaki. But, ... ]
;B[gd]
C[... Black counters White's plan by playing atari with 3 ... ]
;W[he];B[ib]
TR[id]
C[... and 5, discarding his marked stone. ]
;W[jc];B[gc]
LB[cc:A]
C[Black is thick on the left, it will be hard for White to invade the corner at A. <= ]
)
)