(;GM[1]FF[4]SZ[19]
GN[Difference]
PC[https://senseis.xmp.net/?GokyoShumyoSection1Problem3/Solution]AP[GoWiki:2009]
DT[2023-01-12]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection1Problem3/Solution

Difference]
PL[W]

AB[ma][nb][ob][qb][rb][pc][rc][sc]
AW[na][kb][mb][mc][nc][oc][qc][qd][rd][pe][qf]

;W[pb]C[W1]MN[1]
;B[pa]C[B2]MN[2]
;W[pd]C[W3]MN[3]
;W[sd]C[W5]MN[5]
;B[ra]C[B6]MN[6]

;
)
