(;GM[1]FF[4]SZ[19]
GN[Black must answer W2]
PC[http://senseis.xmp.net/?BeginnerExercise25/Solution]AP[GoWiki:2009]
DT[2011-07-13]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise25/Solution

Black must answer W2]
PL[B]

AB[bo][bp][cp][dp][ep][eq][er][gr]
AW[ap][bq][cq][dq][ar][br][dr][es]
LB[ds:b][fs:a]

;B[cs]C[B1]MN[1]
;W[cr]C[W2]MN[2]
;B[bs]C[B3]MN[3]

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