(;
GM[1]
SZ[19]
AW[dd][kc][dp][do][dq][eq][er][fp][ip][no][oo][po][qp]
AB[pc][qe][dr][cr][cq][cp][cn][fq][kq][mp][oq][on][pn][qn]
TR[mp]
C[Problem 114. White to play.  

Black has reinforced his stones at the bottom with the marked stone. How should White respond ? ]
(;W[pq]
TE[2]
C[Correct Answer.  

This is a case where White must defend to ensure that her weak stones don't come under attack. White 1 is the vital point for White to make a base in the corner. Next, ... ]
;B[pr]
LB[pq:1]
C[Besides securing a base for her stones, White 1 also attacks the black stones. Black must defend with 2 ... ]
;W[qr];B[or]
C[... and 4. ]
;W[ro]
C[White now secures the corner with 5, and ... ]
;B[pj]
C[... Black will extend to 6, staking out a position on the right side. <= ]
)
(;W[pj]
C[Failure.  

White 1 is bad. ]
;B[qr]
C[Black slides to 2, expanding his territory and robbing the four white stones of their base. White must escape, but with weak stones above and below, she is sure to fall behind as she tries to rescue them. <= ]
)
)