(;AB[ps][pr][pq][qq][rq][rn][pn][oo][no][np][nq][mr]AW[os][or][oq][op][pp][qp][rp][sp]C[Black to play]SZ[19]
(;B[sr];W[rs];B[sq]C[Black wins the liberty race RIGHT])
(;B[sq];W[rr]
(;B[sr];W[qs]
(;B[po];W[ss]C[Ko ])
(;B[rs];W[ss]C[Ko])
(;B[qo];W[ss])
(;B[ro];W[ss])
(;B[so];W[ss])
(;B[nr];W[ss])
(;B[ns];W[ss]))
(;B[rs];W[sr]))
(;B[rr];W[rs]
(;B[qs];W[sr];B[ss];W[sq]C[Ko, there are even better Ko's to be had then this])
(;B[sq];W[qs]C[Ko]))
(;B[rs];W[sr]
(;B[sq];W[rr])
(;B[rr];W[sq])))