(;GM[1]FF[4]SZ[19]
GN[Black fails]
PC[http://senseis.xmp.net/?SnapbackProblem18/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?SnapbackProblem18/Solution

Black fails]
PL[B]

AB[cb][fb][mb][nb][bc][cc][ec][jc][oc][dd][ed][kd][ld][md][od][pd][qd][de][ne][df][ef][hf][pf][qf][rf][eg][fh][gh][hh][ih][ji][ki][oi][qi][ri][lj][oj][qj][mk][nk][pk][nl][pl][rl][lm][mm][om][pm][rm][ln][ko][mo][no][qo][ro][so][op][pp][qp]
AW[pa][db][eb][ob][qb][dc][kc][lc][mc][nc][pc][qc][cd][nd][rd][ce][me][re][cf][gf][bg][dg][fg][jg][ch][eh][jh][fi][gi][hi][ii][jj][kj][nj][pj][rj][qk][rk][ml][ql][nm][qm][mn][nn][on][pn][qn][rn][lo][lp][mp][np][rp][eq][mq][nq][pq][qq][rq]

;B[li]C[B1]MN[1]
;W[hg]C[W2]MN[2]
;B[ig]C[B3]MN[3]
;W[if]C[W4]MN[4]

;
)
