(;GM[1]FF[4]SZ[19]
GN[The trick]
PC[https://senseis.xmp.net/?ShapeProblem7/Solution]AP[GoWiki:2009]
DT[2019-11-27]
C[Diagram from https://senseis.xmp.net/?ShapeProblem7/Solution

The trick]
PL[W]

AB[fc][ic][dd][cj][bl][am][bm][an][cn][co][dp][ep][jp][eq][br]
AW[mc][pd][qe][qj][cm][bn][bo][ap][cp][pp][bq][cq][dq][nq]

;W[ao]C[W1]MN[1]
;B[ar]C[B2]MN[2]
;W[aq]C[W3]MN[3]
;B[dr]C[B4]MN[4]
;W[cr]C[W5]MN[5]
;B[cs]C[B6]MN[6]

;
)
