(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]PB[Black to play]AB[pr][pq][qp][qo]AW[qr][qq][pp][op][nq][lq][qm][om]C[Black to play]
(;B[rr]C[This follows the proverb "Attch at the weasel's belly".];W[rq];B[qs]
(;W[sr];B[rs]
(;W[sq]
;B[rp]C[Because the corner is in Black's favour White cannot capture Black.])
(;W[or];B[rp]))
(;W[sq];B[rp]
(;W[sr];B[rs])
(;W[rs];B[ss])))
(;B[rq]C[Best possible after this for Black is ko.];W[rr]
(;B[rp];W[or])
(;B[sp];W[or])
(;B[sr];W[rp];B[sp];W[sq]))
(;B[qs]
(;W[rr]C[This is the correct response for White.];B[rp];W[or];B[rq];W[oq])
(;W[rs]C[This is the wrong response for White.];B[rr];W[rq];B[ss])))
