(;GM[1]FF[4]SZ[19]
GN[Why sacrifice a stone?]
PC[http://senseis.xmp.net/?ChemistryAndLife]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ChemistryAndLife

Why sacrifice a stone?]
PL[B]

AB[cp][dp][ep][fp][bq][cq][fq][cr]
AW[cm][bo][bp][dq][eq][gq][hq][dr][fr]
LB[gr:a]

;B[bs]C[B1]MN[1]

;LB[gr:a]
)
