(;GM[1]FF[4]SZ[19]
GN[Possibility]
PC[http://senseis.xmp.net/?RTGProblem28/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?RTGProblem28/Attempts

Possibility]
PL[B]

AB[cp][dp][cq][eq][fq][iq][cr]
AW[fn][bo][co][do][ep][fp][dq][gq][dr][ds]

;B[fr]C[B1]MN[1]
;W[fs]C[W2]MN[2]
;B[gr]C[B3]MN[3]

;
)
