(;GM[1]FF[4]SZ[19]
GN[A threat of a snapback]
PC[http://senseis.xmp.net/?SnapbackProblem31/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?SnapbackProblem31/Solution

A threat of a snapback]
PL[B]

AB[ni][nj][oj][sl][pm][sm][mn][on][qn][no][qo][ro][op][pp]
AW[ki][mi][oi][qi][mj][rj][kk][sk][ql][rl][qm][lo][mo][qp][rp][mq][oq][pq][rq][qr]

;B[rm]C[B1]MN[1]
;W[so]C[W2]MN[2]
;B[rn]C[B3]MN[3]

;
)
