This elementary problem was on the board all the game when we were fighting for connection of this group,me and anohter 4k player, and i found the solution few moves before pass
(;AP[goproblems]AW[rp]AW[sp]AW[qp]AB[ro]AW[rm]AW[qn]AW[po]AW[rl]AB[sk]AB[rk]AB[qk]AW[pp]AW[oo]AW[no]AW[nn]AW[nm]AB[sq]AB[rq]AB[qq]AB[pq]AB[op]AB[np]AB[mp]AB[lo]AB[ok]AB[lm]AB[ml]AB[pm]AB[om]AB[pk]AB[nl]C[White to live](;W[sl];B[sn](;W[rn];B[so]C[Seki - how simple];W[pn]C[RIGHT])(;W[so];B[rn](;W[qm];B[pn])(;W[pn];B[qm]))(;W[qm];B[rn](;W[so];B[pn])(;W[pn];B[so])))(;W[sn];B[sl])(;W[rn];B[sl](;W[sm];B[so])(;W[so];B[sm]))(;W[qm];B[sl])(;W[ql];B[sl])(;W[pn];B[sl])(;W[sm];B[sn])(;W[pl];B[sl])(;W[on];B[sl])(;W[mm];B[sl])(;W[mn];B[sl])(;W[mo];B[sl])(;W[so];B[sl](;W[rn];B[sm])(;W[sm];B[rn]))(;W[qo];B[sl]))