(;
GM[1]
SZ[19]
AW[db][dc][cb][fb][fc][ed][fd][gd][jd][nc][re][pi][qi][pj][nq][jp][cn][dn]
AB[dp][pd][pp][dd][jj][bb][cc][cd][ec][eb][pf][pk][qk][qj][pn][co][fp][fn][cj][ee]
TR[re]
C[Problem 115. Black to play.  

The marked white stone makes a long slide under Black's two stones, hoping to uproot them. How should Black respond ? ]
(;B[rd]
TE[2]
C[Correct Answer.  

Black should defend the corner by attaching at 1. ]
;W[qe];B[qd];W[pe]
LB[qe:2]
C[White will play 2 and 4 to create weaknesses in Black's position, ... ]
;B[oe];W[qg]
C[... then link up her stones on the right side. ]
;B[nd];W[oc];B[od];W[lc];B[pc]
C[Black secures the corner with the sequence to 11. <= ]
)
(;B[qd]
C[How the game continued.  

Black 1 was a lukewarm move because ... ]
;W[qg]
C[... it enabled White to secure her stones on the right side with 2. ]
;B[ne]
C[Black then jumped to 3 and ... ]
;W[ld]
C[... White reinforced her position at the top with 4. Black's stones in the corner are not still secure, so White was able to make more gains by attacking them. <= ]
)
)