(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[0.00]DT[2013-02-23]PC[The KGS Go Server at http://www.gokgs.com/]AW[cn][dp]AB[jp][fq];W[hq];B[hp](;W[iq]C[possible](;B[ip];W[jq](;B[gq];W[lq];B[kp];W[mr])(;B[kq];W[kr];B[lq];W[lr];B[mq];W[gq];B[gp];W[eq]))(;B[jq];W[ip];B[io];W[gp];B[ho];W[gq];B[jo];W[fp]C[locally, it's good for white but on the right side, black can choose this variation to have a big moyo]))(;W[gq]C[not good for white];B[gp](;W[fr];B[eq];W[er];B[dq])(;W[iq];B[ip];W[jq](;B[dq]C[black good exchange];W[cq];B[kq];W[kr];B[ep];W[dr];B[er])(;B[kq]C[bad for black];W[eq];B[fr];W[fp](;B[jr];W[gr]C[black is dead])(;B[gr];W[kr];B[lr];W[jr];B[lq];W[hr]))))(;W[gp]C[not good for white];B[gq];W[ip];B[ho];W[iq];B[io];W[jq](;B[kp];W[lr];B[eo])(;B[kq];W[kr]C[white can't atari because it's causing his own dead];B[lq];W[lr]C[white is low]))(;W[ip]C[possible. When can white choose this option ?](;B[iq];W[io](;B[hr];W[jq];B[gq]C[when ladder is good for white])(;B[ho];W[jq];B[ir];W[kq];B[jo];W[in];B[hr])(;B[jo];W[jq];B[ir](;W[in])(;W[kq])))(;B[io]C[black does not have the ladder, he chooses this variation];W[iq]C[you can play the wedge because there's two cutting points];B[gp];W[jq];B[kp];W[lq])))