(;GM[1]FF[4]SZ[19]
GN[Mistake 9]
PC[https://senseis.xmp.net/?DietersMistakesIn2021/Problem9]AP[GoWiki:2009]
DT[2022-01-22]
C[Diagram from https://senseis.xmp.net/?DietersMistakesIn2021/Problem9

Mistake 9]
PL[B]

AB[ba][da][ma][ab][cb][eb][mb][rb][bc][ec][jc][lc][mc][nc][pc][rc][sc][dd][fd][hd][jd][kd][od][pd][sd][de][fe][ie][me][re][ef][gf][hf][if][kf][nf][of][pf][rf][bg][fg][qg][dh][eh][qh][di][ji][ki][mi][ni][cj][ej][ij][rj][ck][fk][ik][nk][cl][il][em][lm][nm][om][rm][hn][pn][qn][rn][co][do][go][io][jo][ko][ro][ep][fp][ip][kp][lp][qp][fq][iq][kq][nq][qq][nr][pr][qr][ns][os]
AW[ra][db][jb][kb][lb][nb][ob][pb][qb][sb][cc][dc][gc][ic][oc][qc][cd][gd][id][nd][qd][rd][ce][ge][he][je][ne][qe][cf][df][jf][qf][cg][jg][kg][lg][ng][pg][bh][ch][fh][ih][nh][ph][ci][ei][fi][gi][ii][pi][dj][fj][hj][dk][hk][pk][dl][hl][bm][dm][gm][pm][qm][cn][en][fn][mn][nn][on][bo][po][qo][cp][hp][jp][mp][np][pp][dq][eq][hq][jq][lq][mq][oq][pq][hr][ir][jr][kr][mr][or]
LB[mh:a][qj:b][rk:c]

;B[mf]C[B1]MN[1]
;W[se]C[W2]MN[2]
;B[mg]C[B3]MN[3]

;LB[mh:a][qj:b][rk:c]
)
