(;GM[1]FF[4]SZ[19]
GN[Reference.]
PC[http://senseis.xmp.net/?BeginnerExercise26/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise26/Solution

Reference.]
PL[B]

AB[dq][eq][br][cr][dr][fr][bs][fs]
AW[bp][cp][dp][ep][cq][fq][gq][gr][gs]
LB[aq:c][bq:b][es:a]

;B[ds]C[B1]MN[1]

;LB[aq:c][bq:b][es:a]
)
