(;
GM[1]
SZ[19]
AW[dd][jd][nc][dp][nq][qq]
AB[pd][pf][pj][pp][cj][lq]
LB[nq:1][lq:2][qq:3]
TR[pj]
C[Problem 2. Black to play.  

Black has made a sanren-sei with the marked stone. Against White 1, the pincer of Black 2 is often played. How does Black answer White 3 ? ]
(;B[qp]
TR[pj]

TE[2]
C[Correct Answer.  

With the marked stone in the middle of the right side in place, Black 1 is the only move. ]
;W[pq];B[op];W[nr];B[mo]
C[The sequence to Black 5 is a joseki which is often seen in sanren-sei fusekis. <= ]
)
(;B[pq]
TR[pj]
C[Failure.  

With the marked black stone in place, Black 1 is the wrong direction. ]
;W[qp];B[po];W[pr];B[or];W[qr];B[oq];W[qn]
TR[pj]
C[After White 8, the marked stone is misplaced and is not working efficiently. <= ]
)
)