(;GM[1]FF[4]SZ[19]
GN[Solution (White's error)]
PC[http://senseis.xmp.net/?BeginnerExercise158/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise158/Solution

Solution (White's error)]
PL[W]

AB[cp][dp][ep][cq][eq][fq][gq][hq][ar][br][cr][er][hr][cs]
AW[bo][co][do][eo][fo][bp][fp][hp][ip][bq][iq][dr][fr][gr][ir][ds][es][hs]

;W[fs]C[W1]MN[1]
;B[dq]C[B2]MN[2]
;W[gs]C[W3]MN[3]
;B[is]C[B4]MN[4]

;
)
