(;GM[1]FF[4]SZ[19]
GN[Black lives, but loses a big ko threat.]
PC[http://senseis.xmp.net/?BeginnerExercise262/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise262/Attempts

Black lives, but loses a big ko threat.]
PL[B]

AB[gh][hh][ih][kh][fi][ki][fj][gj][hj][ij][kj][ik][kk][fl][gl][hl][kl][ll][ml][nl]
AW[fg][gg][hg][ig][jg][kg][lg][mg][ng][eh][lh][oh][ei][hi][ii][ji][oi][ej][jj][oj][ek][ok][el][jl][ol][fm][gm][hm][im][jm][km][lm][mm][nm]

;B[jh]C[B1]MN[1]
;W[jk]C[W2]MN[2]
;B[mj]C[B3]MN[3]

;
)
