(;GM[1]FF[4]SZ[19]
GN[If Black 1 at a]
PC[http://senseis.xmp.net/?TsumegoFromGames25/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TsumegoFromGames25/Solution

If Black 1 at a]
PL[B]

AB[qd][rd][oe][qe][pf][pg][oh][rh][oi][ri][oj][qj][pk][qk][pl][ql][rl][qm]
AW[re][qf][rf][qg][qh][pi][qi][pj][rj][ok][nl][mm][om][pm][rm][pn][qn][rn][pp]

;B[sj]C[B1]MN[1]
;W[sl]C[W2]MN[2]
;B[rk]C[B3]MN[3]
;W[sh]C[W4]MN[4]
;B[sk]C[B5]MN[5]
;W[rg]C[W6]MN[6]
;B[se]C[B7]MN[7]
;W[sg]C[W8]MN[8]
;B[ph]C[B9]MN[9]

;
)
