(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[0.00]PW[white]PB[black];B[pd];W[dp];B[pp];W[dc];B[ce];W[cg];B[ee];W[fd];B[hd];W[fe](;B[ef](;W[cd];B[be];W[ff];B[eg];W[fg];B[di];W[de]LB[kd:B][ci:A]C[this exchange is not good for white because maybe, white would want to escape later with A. white urgent point is B];B[cf];W[df];B[dg];W[dd](;B[ch];W[bg];B[bd];W[bc];B[bh]C[At the end, white is sente and had a corner];W[eh]C[later, white would have some forcing moves sente];B[dh];W[ad];B[ag];W[ae];B[bf])(;B[bg]C[if black ataris this side, it would be better];W[bd]C[white has to make a move to get the corner];B[kd]C[and black will get sente]))(;W[di]C[if white plays here now, ];B[ff]C[black turn and it will be difficult for white (less liberties)])(;W[ff]C[pushing one time gives white more space to go into the center](;B[eg];W[di];B[fg];W[hf])(;B[dh];W[ci];B[fh]C[black is still good]))(;W[gf];B[dh];W[ie](;B[cj];W[jc]C[you kill one of mine, i kill your one. ])(;B[jc];W[ci]C[You escape, I will also])))(;B[dg];W[cd](;B[cf];W[fg](;B[ch]C[usual joseki])(;B[di]C[black can also play here but ...];W[cl]C[if white has a stone here];B[]C[(black tenuki)];W[ch]C[it would be troublesome for black]))(;B[bd];W[bc];B[ch]C[also possible for black if he is worried about center];W[be];B[bf];W[ad]TR[fg]C[white can get some points on Yose, but white does not have a stone at the marked space])))