(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?RTGProblem57/Solution]AP[GoWiki:2009]
DT[2009-07-28]
C[Diagram from http://senseis.xmp.net/?RTGProblem57/Solution

Solution]
PL[B]

AB[gm][eo][fo][go][ap][bp][cp][dp][ep][gp][gq][hq][hr]
AW[ck][cn][en][bo][io][fp][bq][eq][fq][iq][br][fr][gr]

;B[dr]C[B1]MN[1]
;W[dq]C[W2]MN[2]
;B[ar]C[B3]MN[3]

;
)
