Problem	1641
Created	2002-10-08
Source	Perfectionnement au go par Pierre Aroutcheff
Rating

Difficulty	27 kyu
Average Solve Time	19 secs
User Attempts	46203 / 61338
Solve Ratio Rating	25 kyu
	rating history

(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[13]KM[0.00]TM[] PW[none]PB[none]AW[fl][gl][hl][il][jl][hm][jm]AB[ck][ek][fk][gk][hk][ik][jk][kk][cl][kl]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.])