(;GM[1]FF[4]SZ[19]
GN[Black kills after white's mistake]
PC[http://senseis.xmp.net/?KyuExercise4/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?KyuExercise4/Attempts

Black kills after white's mistake]
PL[B]

AB[lo][oo][kp][np][iq][kq][oq][pq][qq][rq][jr][rr][ps][qs]
AW[lq][mq][nq][kr][or][pr][qr][ks][os]

;B[rs]C[B1]MN[1]
;W[nr]C[W2]MN[2]
;B[ms]C[B3]MN[3]

;
)
