(;GM[1]FF[4]SZ[4:3]
GN[13-16]
PC[http://senseis.xmp.net/?ShortestAToBProofGames3x4/Solution]AP[GoWiki:2009]
DT[2015-03-24]
C[Diagram from http://senseis.xmp.net/?ShortestAToBProofGames3x4/Solution

13-16]
PL[B]

AB[aa][ba][ca][bb][cb]
AW[db]

;B[dc]C[B13]MN[13]
;W[cc]C[W14]MN[14]
;B[ab]C[B15]MN[15]
;W[da]C[W16]MN[16]

;
)
