(;
GM[1]
SZ[19]
AW[fc][co][cn][dm][cj][nq][qq][qp][pn]
AB[dp][pd][pp][dd][cf][db][en][dn][cp][jq][oo][pq]
LB[fc:1][cf:2][db:11][cp:8][co:7][cn:3][dn:4][dm:5][en:6][cj:9]
LB[jq:12][nq:11][oo:14][pn:13][qq:15][qp:17][pq:16]
C[Problem 126. Black to play.  

How should Black respond to White 17 ? ]
(;B[on]
TE[2]
C[Correct Answer.  

Pushing out with Black 1 ... ]
;W[pm];B[om]
C[... and 3, aiming to make a moyo at the bottom, is a good strategy. ]
;W[po];B[op];W[pl]
C[White will secure the right side with the sequence to 6, but ... ]
;B[jo]
C[... Black can then reinforce the bottom by jumping to 7. It will be now very hard for White to invade this huge valley of territory. <= ]
)
(;B[qr]
C[How the game continued.  

The hane of Black 1 was also a good move in this position. ]
;W[po]
C[White settled her stones on the right with 2, ... ]
;B[np];W[mp];B[mo];W[lp]
LB[mp:4]
C[... then pulled out her stone at the bottom with 4 and 6. This was, however, an overplay. White's stones are heavy and vulnerable, while Black's are strong and flexible. See Problem 130 for the continuation. <= ]
)
)