(;AW[iq]AW[ip]AB[jp]AB[jq]AW[io]AW[jo]AB[lp]AW[ko]AW[mo]AB[mp]AW[lo]AB[no]AB[op]C[In the endgame,sente is very important,how can B proctect his area in sente?(advoid KO)]LB[np:T]AW[dp]AW[cq]AW[fp]AP[goproblems]
(;B[np];W[jr]
(;B[kq];W[kr]C[Reasonable shrink])
(;B[kr];W[kq];B[kp];W[ks]
(;B[lq];W[ir])
(;B[lr];W[ir])))
(;B[ir];W[hr];B[jr]C[gote])
(;B[jr];W[ir]C[Sucsessful protection in sente!RIGHT]))