(;GM[1]FF[4]SZ[19]
GN[Example 4a: four times 1/4 equals?]
PC[https://senseis.xmp.net/?Corridor]AP[GoWiki:2009]
DT[2019-12-22]
C[Diagram from https://senseis.xmp.net/?Corridor

Example 4a: four times 1/4 equals?]
PL[B]

AB[fh][gh][hh][jh][kh][lh][fj][gj][hj][jj][kj][lj][fl][gl][hl][jl][kl][ll]
AW[eh][ih][mh][ei][ii][mi][ej][ij][mj][ek][ik][mk][el][il][ml]

;B[fi]C[B1]MN[1]
;W[hi]C[W2]MN[2]
;B[fk]C[B3]MN[3]
;W[hk]C[W4]MN[4]
;B[ji]C[B5]MN[5]
;W[li]C[W6]MN[6]
;B[jk]C[B7]MN[7]
;W[lk]C[W8]MN[8]

;
)
