(;
GM[1]
SZ[19]
AW[dd][nq][kq][ko][eq][dp][dn]
AB[pd][pi][oo][qo][pq][iq][fq][fp]
TR[pi]
C[Problem 23. White to play.  

Black has stakes out a moyo on the right side with the marked stone. What should White do ?  

[You will find a supplement to this Problem Diagram as "Problem 138"] ]
;W[io]
TE[2]
C[Correct Answer.  

White should cap with 1. ]
;B[fn]
C[If Black jumps to 2, ... ]
;W[go]
C[... White will peep with 3, ... ]
;B[fo];W[dl]
C[... then jump to 5, staking out territory on the left side. Black's stones are heavy and Black must continue to defend them. <= ]
)
)