(;AB[sq]AB[rq]AB[qr]AB[qs]AW[qq]AW[qp]AW[rp]AW[sp]AW[qo]AW[rm]AW[qm]AW[po]AW[on]AW[op]AW[np]AW[nn]AW[mo]AB[pq]AB[pp]AB[ps]AB[or]AB[oq]AB[nq]AB[mq]AB[lp]AB[lo]AB[ln]AB[lm]AB[pn]AB[pm]AB[pl]AB[ql]AB[rl]AB[rj]AB[nl]C[Simple problem showing advanced tesuji.]AP[goproblems]
(;B[oo];W[rr]
(;B[sr];W[ss]
(;B[sq]
(;W[qn]C[CHOICE]
(;B[rs];W[rq]
(;B[sr];W[ss]
(;B[sr]C[RIGHT])
(;B[sn];W[sm];B[sr]C[RIGHT]))
(;B[sn];W[sm];B[sr];W[ss];B[sr]C[RIGHT]))
(;B[sr];W[rq];B[rs];W[sr])
(;B[rq];W[sr])
(;B[sn];W[sm];B[rs];W[rq];B[sr];W[ss];B[sr]C[RIGHT]))
(;W[rq]C[CHOICE]
(;B[rn];W[qn]
(;B[sm];W[sn];B[so];W[ro];B[sn];W[sl];B[sn];W[sm])
(;B[rs];W[sn]
(;B[ro];W[sr])
(;B[sr];W[ro])))
(;B[rs];W[sr];B[rn];W[qn];B[sm];W[sn];B[so]C[White can't push.RIGHT]))
(;W[rs]C[CHOICE]
(;B[rn];W[qn];B[sm];W[sn];B[so]C[White can't pushRIGHT])
(;B[rq];W[sr]
(;B[rq];W[qn];B[sq];W[rr]C[Anti tesuji :)])
(;B[rn];W[qn];B[sm];W[sn];B[so];W[ro]
(;B[rq];W[sn])
(;B[sn];W[sl];B[sn];W[sm]))
(;B[sq];W[qn];B[rq];W[rr]C[Anti tesuji :)]))
(;B[qn];W[rn];B[sm];W[sn]))
(;W[sr]
(;B[rs];W[rq];B[rn];W[qn];B[sm];W[sn];B[so]C[White can't push.RIGHT])
(;B[rn];W[qn];B[rs];W[sn]
(;B[ro];W[rq])
(;B[rq];W[ro]))
(;B[qn];W[rn];B[sm];W[sn])))
(;B[qn];W[rn];B[sq];W[rq])
(;B[rn];W[qn]
(;B[sq];W[sn];B[ro];W[rq])
(;B[sm];W[sn];B[so];W[ro];B[sn];W[sl];B[sn];W[sm]
(;B[sq];W[rq])
(;B[rs];W[sr])))
(;B[sn];W[rs];B[sq];W[rn])
(;B[rs];W[sq];B[rn];W[qn];B[sm];W[sn];B[so];W[ro];B[sn];W[sl];B[sn];W[sm];B[sr]C[Only a ko.])
(;B[sr];W[sq]
(;B[rs];W[qn];B[sr]C[Only a ko.])
(;B[qn];W[rn];B[sm];W[sn])))
(;B[rn];W[qn];B[sm];W[sr]
(;B[rs];W[sn];B[so];W[ro]
(;B[sn];W[sl];B[sn];W[sm])
(;B[sl];W[sn]))
(;B[sn];W[rs]))
(;B[qn];W[rn];B[sm];W[sr]
(;B[sn];W[rs])
(;B[rs];W[sn]))
(;B[rs];W[sr]
(;B[rn];W[qn];B[sm];W[sn];B[so];W[ro]
(;B[sn];W[sl];B[sn];W[sm])
(;B[sl];W[sn]))
(;B[qn];W[rn];B[sm];W[sn])))
(;B[rr];W[oo]
(;B[rn];W[qn];B[sm];W[sn];B[so];W[ro];B[sn];W[sl])
(;B[qn];W[rn];B[sm];W[sn]))
(;B[qn];W[oo]
(;B[rn];W[rr])
(;B[rr];W[rn];B[sm];W[sn]))
(;B[rn];W[qn]
(;B[sm];W[oo]
(;B[sn];W[rr])
(;B[rr]))
(;B[oo];W[sn]
(;B[ro];W[rr])
(;B[rr];W[ro]))
(;B[rr];W[sn]
(;B[ro];W[oo])
(;B[oo];W[ro])))
(;B[sn];W[sm];B[qn];W[rn])
(;B[ro];W[rn]
(;B[oo];W[rr])
(;B[rr];W[oo])
(;B[sm];W[so]
(;B[rr];W[oo])
(;B[oo];W[rr])))
(;B[so]C[This doesn't need comment.])
(;B[sr];W[oo];B[rn];W[qn];B[sm];W[sn];B[so];W[ro];B[sn];W[sl])
(;B[sm];W[oo]
(;B[rr];W[rn])
(;B[rn];W[qn]
(;B[sn];W[rr])
(;B[rr];W[sn];B[so];W[ro];B[sn];W[sl])))
(;B[sl];W[qn]
(;B[oo];W[rr])
(;B[rr];W[oo])
(;B[sm];W[sn]
(;B[oo];W[rr])
(;B[rr];W[oo]))))
