(;GM[1]FF[4]SZ[19]
GN[White can't play at ''c'']
PC[https://senseis.xmp.net/?GokyoShumyoSection7Problem33/Attempts]AP[GoWiki:2009]
DT[2023-01-25]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection7Problem33/Attempts

White can't play at ''c'']
PL[B]

AB[nc][oc][pd][pe][mf][pf][pg][oh][oi]
AW[lc][pc][qc][ld][qd][me][qe][lf][of][qf][mg][ph][qh]
LB[od:c]

;B[nf]C[B1]MN[1]
;W[oe]C[W2]MN[2]
;B[og]C[B3]MN[3]

;LB[od:c]
)
