(;GM[1]FF[4]SZ[19]
GN[]
PC[https://senseis.xmp.net/?EfficiencyExample1]AP[GoWiki:2009]
DT[2023-10-02]
C[Diagram from https://senseis.xmp.net/?EfficiencyExample1

]
PL[B]

AB[pa][qa][db][gb][hb][kb][nb][ob][rb][dc][fc][lc][oc][qc][fd][od][qd][le][re][qf][rf][kg][lg][pg][ci][gj][fk][hk][fl][hl][cm][dm][gm][hm][cn][jn][lo][hp][ip][jp][kp][cq][dq][gq][er][fr][gr]
AW[eb][fb][ib][pb][qb][gc][hc][jc][nc][pc][nd][pd][je][ne][oe][qe][hf][of][pf][qg][rg][lh][mh][ph][cl][dl][el][fm][dn][fn][hn][bo][co][dp][fp][gp][lp][mp][pp][qp][fq][hq][iq][jq][kq]
LB[ha:b][id:a]

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

;LB[ha:b][id:a]
)
