(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black]AW[dn][do][cp][gp][cq][fq][br]AB[eo][dp][fp][dq][jq][cr][dr]LB[dn:3][en:C][do:9][eo:4][go:A][cp:7][fp:10][gp:13][cq:5][dq:6][fq:1][gq:B][jq:2][br:11][cr:8][dr:12]C[White 13 (G4) is hamete. How should Black respond?]
(;B[go]CR[go]
;W[ip]CR[ip]
(;B[hp]CR[hp]
;W[iq]CR[iq]
;B[gq]CR[gq]
;W[kq]CR[kq]C[White sacrified two stones to gain a strong position on the right keeping the Black group confined. In addition an original Black pinching stone at K3 has been rendered useless.
Black's Initial move at G5 wasn't a forcing move allowing White to play J4 that threatened the single black stone on the right.])
(;B[gq]CR[gq]
;W[gr]CR[gr]
;B[hq]CR[hq]
;W[iq]CR[iq]
;B[hr]CR[hr]
;W[ir]CR[ir]C[After this exchange, the Black stones are confined, White has become stronger on the right and Black's K3 stone has been rendered useless.]))
(;B[gq]CR[gq]
;W[hq]CR[hq]
;B[gr]CR[gr]
;W[hr]CR[hr]
;B[go]CR[go]
;W[hp]CR[hp]
;B[fr]CR[fr]
;W[ho]CR[ho]
;B[gn]CR[gn]
;W[lq]CR[lq]C[Black is over-concentrated, while White has solid groups on both sides.])
(;B[en]CR[en]
;W[dm]CR[dm]
;B[em]CR[em]
;W[dl]CR[dl]
;B[el]CR[el]
(;W[hq]CR[hq]C[CHOICE White tries to protect his investment]
;B[dk]CR[dk]
;W[ck]CR[ck]
;B[cj]CR[cj]
(;W[bl]CR[bl]C[CHOICE]
;B[bk]CR[bk]
;W[cl]CR[cl]
;B[dj]CR[dj]C[RIGHT The result is a very strong outside position for Black])
(;W[bj]CR[bj]
;B[cl]CR[cl]
;W[bk]CR[bk]
;B[co]CR[co]C[RIGHT White loses the edge.]))
(;W[dk]CR[dk]
;B[hq]CR[hq]
;W[gq]CR[gq]
;B[ho]CR[ho]
;W[go]CR[go]
;B[gn]CR[gn]C[RIGHT After this sequence Black has gained territory on the side and has developed influence on the outside.])))