(;
GM[1]
SZ[19]
AW[dc][oc][qo]
AB[qd][pq][cp]
LB[qd:1][oc:4][dc:3][cp:5][pq:3][qo:6]
C[Problem 12. Black to play.  

The pattern of Black 1, 3, and 5 is known as the Shusaku opening. After White 6, where should Black play ? ]
;B[pe]
LB[ld:A]

TE[2]
C[Correct Answer.  

Black 1 is the famous diagonal move of Honinbo Shusaku. It is a solid move and White will have a hard time equalising. In Shusaku's time, however, games were played without a komi, but today a 5.5-point komi is given White as compensation for her playing second. For that reason, Black 1 is considered to be a bit passive, so nowadays professionals usually make a pincer around A. <= ]
)
)