(;GM[1]FF[4]SZ[19]
GN[Black is captured because of self atari]
PC[http://senseis.xmp.net/?BeginnerExercise222/Discussion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise222/Discussion

Black is captured because of self atari]
PL[B]

AB[fa][bb][db][eb][fb][bc][cc][ec][dd][ed]
AW[ba][da][ga][ab][gb][ac][fc][gc][bd][cd][fd][de][ee][fe][cf]

;B[cb]C[B1]MN[1]
;W[ca]C[W2]MN[2]
;B[ea]C[B3]MN[3]
;W[dc]C[W4]MN[4]

;
)
