(;GM[1]FF[4]SZ[19]
GN[Failure]
PC[https://senseis.xmp.net/?UnderTheStonesProblem4/Solution]AP[GoWiki:2009]
DT[2023-04-18]
C[Diagram from https://senseis.xmp.net/?UnderTheStonesProblem4/Solution

Failure]
PL[B]

AB[dn][en][fn][gn][bo][do][ho][cp][aq][bq][gq][hq][cr][dr][hr][hs]
AW[eo][dp][fp][cq][dq][eq][fq][ar][br][er][gr][gs]

;B[bs]C[B1]MN[1]
;W[ds]C[W2]MN[2]
;B[as]C[B3]MN[3]
;W[fo]C[W4]MN[4]

;
)
