(;GM[1]FF[4]SZ[19]
GN[Black captures]
PC[http://senseis.xmp.net/?BeginnerExercise20/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise20/Solution

Black captures]
PL[W]

AB[ea][ab][bb][db][eb][cc]
AW[fa][fb][bc][ec][fc][bd][cd][dd]

;W[ca]C[W1]MN[1]
;B[ba]C[B2]MN[2]
;W[cb]C[W3]MN[3]
;B[da]C[B4]MN[4]

;
)
