(;GM[1]FF[4]SZ[19]
GN[Mistake 21]
PC[https://senseis.xmp.net/?DietersMistakesIn2021/Solution21]AP[GoWiki:2009]
DT[2022-01-24]
C[Diagram from https://senseis.xmp.net/?DietersMistakesIn2021/Solution21

Mistake 21]
PL[W]

AB[ca][bb][db][pb][qb][bc][cc][nc][qc][dd][ed][fd][qd][be][ce][df][ef][qf][dn][po][pp][dq][lq][pq][nr][or]
AW[eb][ob][dc][ec][gc][lc][oc][pc][bd][cd][gd][pd][pe][cf][gf][bg][dg][ch][fh][qn][qp][nq][qq][pr][qr]
LB[he:b]

;W[og]C[W1]MN[1]
;B[ck]C[B2]MN[2]
;W[kp]C[W3]MN[3]

;LB[he:b]
)
