(;GM[1]FF[4]SZ[19]
GN[Reference diagram]
PC[http://senseis.xmp.net/?TwoSquares/Sandbox]AP[GoWiki:2009]
DT[2018-10-20]
C[Diagram from http://senseis.xmp.net/?TwoSquares/Sandbox

Reference diagram]
PL[B]

AB[fh][gh][hh][ih][jh][kh][lh][mh][nh][fi][li][fj][kj][fk][nk][fl][gl][hl][il][jl][kl][ll]
AW[gi][hi][ii][ji][ki][gj][ij][lj][gk][hk][ik][jk][kk]
CR[li][kj]

;B[lk]C[B1]MN[1]

;CR[li][kj]
)
