(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[NZ]SZ[19]KM[7.00]TM[1800]OT[5x30 byo-yomi]DT[2013-05-25]PC[The KGS Go Server at http://www.gokgs.com/];B[pd];W[dp];B[pp];W[dd];B[fc];W[cf];B[fq];W[hq](;B[cn];W[fp](;B[cq](;W[dq];B[cp];W[do](;B[dr]C[black should descend only (trick move)](;W[er];B[cr];W[eq]C[joseki good for black])(;W[co]C[how to punish black](;B[bo];W[bp];B[bq];W[bn];B[ap];W[er];B[cr];W[bm]LB[eq:A]C[or white can connect at A. This is good for white])(;B[er];W[bo];B[gp];W[gq];B[fo];W[ep];B[br];W[jp];B[go];W[dm]C[black had a small corner but black is heavy outside against a powerful white])))(;B[cr]C[if black connect his four stone, it is gote];W[dr];B[]C[later, white can push then hane];W[co];B[bo];W[cs](;B[bs]C[black can't block];W[bn])(;B[bq];W[cl])(;B[bm];W[br];B[bq];W[aq];B[bp]C[black lost his corner])))(;W[cp];B[dq];W[ep];B[fr];W[bp];B[bq];W[dm]C[joseki]))(;B[gp];W[gq](;B[cq](;W[eq];B[cp]C[joseki])(;W[cp];B[ep];W[fo];B[eo];W[eq];B[dq];W[fr];B[er];W[fq]C[professionnel players think this result is good for white : black has a big corner but white shape is very strong];B[do];W[bp];B[bq];W[en];B[cl];W[dr];B[cr];W[es];B[co];W[np]C[black has the corner but white can get the side or attack on the right]))(;B[cp]C[if black wants corner];W[cq];B[ep];W[fo];B[dq];W[do];B[eo];W[en];B[eq];W[dn];B[fn];W[go];B[co];W[dl](;B[cr];W[bq];B[br];W[fr];B[er];W[es];B[dr];W[cm];B[bm];W[bl];B[an];W[hp]C[result very good for white (influence bigger than corner])(;B[cl];W[cm];B[bm];W[dm];B[cr];W[bq];B[br];W[fr];B[er];W[es];B[dr];W[bl];B[an];W[ck];B[hp];W[gn]))))(;B[cq];W[dq];B[cp];W[do];B[dr];W[er];B[cr];W[eq];B[cn];W[fp]C[white will not play this move now compare to the original diagram]))