(;GM[1]FF[4]SZ[19]
GN[Mistake 20]
PC[https://senseis.xmp.net/?DietersMistakesIn2021/Problem20]AP[GoWiki:2009]
DT[2022-01-24]
C[Diagram from https://senseis.xmp.net/?DietersMistakesIn2021/Problem20

Mistake 20]
PL[B]

AB[ca][bb][db][nb][pb][qb][bc][cc][nc][qc][dd][ed][fd][kd][qd][be][ce][he][ne][re][df][ef][lf][qf][qg][dn][po][pp][dq][lq][pq][nr][or]
AW[na][eb][ob][dc][ec][gc][lc][oc][pc][bd][cd][gd][pd][ge][pe][qe][cf][gf][pf][bg][dg][kg][lg][mg][og][ch][fh][qn][qp][nq][qq][pr][qr]
LB[ma:c][lb:b][kc:a]


;LB[ma:c][lb:b][kc:a]
)
