A hypothetical position, inspired in part by problem 3048 by unkx80, and the comments made, particulary those by Hans and Andre Engels. Please note that this is a full board position.
(;AB[bq]AB[aq]AB[cq]AB[dq]AB[dr]AB[ds]AB[br]AB[as]AW[bs]AW[cs]AW[ap]AW[bp]AW[cp]AW[dp]AW[eq]AW[er]AW[es]AW[sq]AW[rq]AW[qq]AW[pq]AW[pr]AW[ps]AW[rr]AB[qs]AB[rs]AW[ss]AB[sp]AB[rp]AB[qp]AB[pp]AB[oq]AB[or]AB[os]AB[sc]AB[rc]AB[qc]AB[pc]AB[pb]AB[pa]AB[rb]AW[sd]AW[rd]AW[qd]AW[pd]AW[oc]AW[ob]AW[oa]AB[ad]AB[bd]AB[cd]AB[dd]AB[ec]AB[eb]AB[ea]AW[da]AW[db]AW[dc]AW[cc]AW[bc]AW[ac]AW[bb]AW[aa]AB[sa]AW[ra]AW[qa]AB[ba]AB[ca]LB[sr:A]C[Can black acheive any gain by starting the ko fight at this stage? If you think so play at A. If not, play at T]LB[dj:T]LB[jd:T]LB[jj:T]LB[pj:T]LB[jp:T]AP[goproblems]
(;B[sr];W[cb]C[White saves her corner. Now play at B please]LB[qr:B];B[qr]C[Black captures 7 stones];W[ar]C[Please play at C]LB[qb:C];B[qb]C[Black saves her corner];W[cr]C[White captures 7 stones. The position ends equal. Black has not gained anything by starting the ko fight at this stage. Whatever variation is used, the result is the same.])
(;B[jd]C[As the corners stand there is no gain to be had by black in starting the ko fight, as the result ends equal, therefore black tenukis RIGHT])
(;B[jj]C[As the corners stand there is no gain to be had by black in starting the ko fight, as the result ends equal, therefore black tenukis RIGHT])
(;B[pj]C[As the corners stand there is no gain to be had by black in starting the ko fight, as the result ends equal, therefore black tenukis RIGHT])
(;B[dj]C[As the corners stand there is no gain to be had by black in starting the ko fight, as the result ends equal, therefore black tenukis RIGHT])
(;B[jp]C[As the corners stand there is no gain to be had by black in starting the ko fight, as the result ends equal, therefore black tenukis RIGHT]))