(;AW[mb][lc][nc][oc][rc][sc][md][pd][qd][re]AB[pb][rb][sb][pc] (;B[qc]CR[qc] (;W[qa]CR[qa]C[CHOICE] (;B[ra]CR[ra] ;W[pa]CR[pa] (;B[ob]CR[ob] ;W[oa]CR[oa] (;B[na]CR[na] ;W[nb]CR[nb] ;B[qb]CR[qb]C[RIGHT Note however that with better play, white could have made a ko.]) (;B[nb]CR[nb] ;W[na]CR[na])) (;B[oa]CR[oa] ;W[ob]CR[ob] ;B[qb]CR[qb] ;W[pa]CR[pa]C[Only one real eye.]) (;B[qb]CR[qb] ;W[oa]CR[oa])) (;B[pa]CR[pa] ;W[ra]CR[ra]) (;B[ob]CR[ob] ;W[ra]CR[ra])) (;W[pa]CR[pa]C[CHOICE] (;B[ob]CR[ob] ;W[ra]CR[ra] (;B[qa]CR[qa] ;W[qb]CR[qb]C[RIGHT Indeed, ko is the best you can do]) (;B[oa]CR[oa] ;W[qa]CR[qa]) (;B[qb]CR[qb] ;W[qa]CR[qa] (;B[nb]CR[nb] ;W[na]CR[na]) (;B[na]CR[na] ;W[nb]CR[nb]))) (;B[qa]CR[qa] ;W[oa]CR[oa]) (;B[oa]CR[oa] ;W[qa]CR[qa] ;B[ra]CR[ra] ;W[ob]CR[ob] ;B[qb]CR[qb] ;W[pa]CR[pa]))) (;B[ra]CR[ra] ;W[qb]CR[qb] ;B[qc]CR[qc] ;W[pa]CR[pa] (;B[qa]CR[qa] ;W[oa]CR[oa]) (;B[ob]CR[ob] ;W[oa]CR[oa] (;B[qa]CR[qa] ;W[na]CR[na]) (;B[na]CR[na] ;W[nb]CR[nb]))) (;B[qb]CR[qb] ;W[ob]CR[ob] (;B[pa]CR[pa] ;W[ra]CR[ra]) (;B[ra]CR[ra] ;W[pa]CR[pa])) (;B[ob]CR[ob] ;W[qc]CR[qc] (;B[qb]CR[qb] ;W[ra]CR[ra] (;B[oa]CR[oa] ;W[qa]CR[qa]) (;B[qa]CR[qa] ;W[oa]CR[oa]) (;B[nb]CR[nb] ;W[na]CR[na] (;B[oa]CR[oa] ;W[qa]CR[qa]) (;B[qa]CR[qa] ;W[oa]CR[oa]) (;B[ma]CR[ma] ;W[la]CR[la]))) (;B[nb]CR[nb] ;W[qb]CR[qb]) (;B[qa]CR[qa] ;W[qb]CR[qb])) (;B[qa]CR[qa] ;W[qc]CR[qc]))