(;
GM[1]
SZ[19]
AW[dq][co][lo][ml][ol][om][pl][on][oo][qo][ro][ne][md][od][qc]
AB[dd][pq][qp][np][no][mn][ln][pm][qm][ql][pk][rc][qd][pe][oe]
C[Problem 127. White to play.  

The white stones in the lower right don't have eyes. What should White do ? ]
(;W[oi]
TE[2]
C[Correct Answer.  

White should attack with 1. ]
;B[qi]
C[Black is forced to submissively defend on the third line with 2. ]
;W[nj]
LB[qh:A]
C[Next, White 3 threatens to attach at A, ... ]
;B[ph]
C[... so Black defends with 4. ]
;W[ng]
C[White can now build influence throughout the center with 5. <= ]
)
(;W[pi]
C[Failure.  

White 1 looks like a tesuji. Players who have studied this move in joseki books would be tempted to play it. But ... ]
(;B[oj]
LB[pi:1]
C[... Black will answer White 1 with the diagonal move of 2. ]
(;W[oi]
C[If White plays the normal moves of 3 ... ]
;B[nj];W[mh]
C[... and 5, ... ]
;B[lj]
C[... her eight stones below are in serious trouble. <= ]
)
(;W[nj]
C[Failure.  

White 1 is crude. ]
;B[pi]
C[It just provokes Black to defend his territory on the fourth line with 2. <= ]
)
(;W[lj]
C[If White 3 here, ... ]
;B[oi]
LB[pi:1]
C[... Black quells the white stone at 1 by playing at 4. <= ]
))
(;B[ok]
C[If Black follows the usual sequence of 2 ... ]
;W[nk];B[oj]
C[... and 4, his stones are in trouble ... ]
;W[nh];B[qj];W[qi]
LB[rk:A][nh:5]
C[... after White 5 and 7. Next, White A is a deadly move. <= ]
))
)