(;GM[1]FF[4]SZ[19]
GN[Half marks]
PC[http://senseis.xmp.net/?RTGProblem26/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?RTGProblem26/Solution

Half marks]
PL[B]

AB[nb][ob][rb][sb][nc][pc][qc][nd][pd][ne][oe]
AW[na][oa][qa][kb][mb][mc][rc][sc][md][qd][me][pe][re][mf][of][pf]

;B[qb]C[B1]MN[1]
;W[pa]C[W2]MN[2]
;B[ra]C[B3]MN[3]

;
)
