(;GM[1]FF[4]SZ[3]
GN[1-3]
PC[http://senseis.xmp.net/?ShortestAToBProofGames3x3/Solution]AP[GoWiki:2009]
DT[2015-03-24]
C[Diagram from http://senseis.xmp.net/?ShortestAToBProofGames3x3/Solution

1-3]
PL[B]

AB[aa][cc]
AW[ba][ca][bb][ac]

;B[bc]C[B1]MN[1]
;B[ab]C[B3]MN[3]

;
)
