(;GM[1]FF[4]SZ[19]
GN[Reason]
PC[http://senseis.xmp.net/?TsumegoFromGames27/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TsumegoFromGames27/Solution

Reason]
PL[B]

AB[bm][cn][co][eo][fo][go][cp][gp][bq][fq]
AW[bn][bo][bp][dp][ep][fp][cq][cr][er]
LB[aq:a]

;B[ap]C[B1]MN[1]
;W[br]C[W2]MN[2]
;B[ar]C[B3]MN[3]

;LB[aq:a]
)
