(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]C[Just play through the moves to move 24 which is the problem position. 
These do not represent a game sequence!]
;B[qr]
;W[pr]
;B[or]
;W[qq]
;B[rr]
;W[rq]
;B[sq]
;W[qp]
;B[rp]
;W[pp]
;B[ro]
;W[op]
;B[oq]
;W[nq]
;B[os]
;W[nr]
;B[np]
;W[mp]
;B[no]
;W[ns]
;B[on]
;W[lq]
;B[qn]
;W[jq]C[This is the problem position. Black to play.]
(;B[ps]C[This move will fail...]
;W[qs]
;B[pq]
;W[pr]C[.. as it's a snapback.])
(;B[qs]C[The empty triangle is correct. It isn't always a bad move
especially at the edge of the board.]
(;W[pq]
;B[ps]C[Black easily connects and the white stones die,])
(;W[ps]
;B[pq]C[This clearly doesn't work for white.])))
