(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]SZ[13]AW[fl][gl][hl][il][jl][hm][jm]AB[ck][ek][fk][gk][hk][ik][jk][kk][cl][kl]RU[Japanese]TM[]PW[none]PB[none]C[How can black kill white ? You must sacrifice stones to succeed.](;B[fm]CR[fm];W[el]CR[el](;B[em]CR[em];W[dm]CR[dm];B[dl]CR[dl];W[gm]CR[gm];B[em]CR[em]C[RIGHT You got white =^.^= . This technique of sacrificing a stone on a connection point is called Horikomi.])(;B[dl];W[em]))(;B[el];W[fm])(;B[em];W[fm])(;B[dm];W[fm]))