(;GM[1]FF[4]SZ[19]
GN[White has choice: either ''a'', allowing Black to live, or ''b'', White ''a'' with a large ko.]
PC[http://senseis.xmp.net/?ChemistryAndLife]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ChemistryAndLife

White has choice: either ''a'', allowing Black to live, or ''b'', White ''a'' with a large ko.]
PL[B]

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


;LB[ar:b][ds:a]
)
