(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
C[Getting stronger in the coner 1]PL[B]
;B[pd]
(;B[nc]
;B[qe]LB[kc:B][qg:A]
(;W[qc]C[Let's start with this aji.

]
(;B[pc]C[If black answers every white's move, ...]
;W[rd]
(;B[re]
;W[pb]
(;B[ob]
;W[rb]
;B[pa]
;W[qa]C[It will be Ko.])
(;B[rb]C[Black can play to kill at this vital point]
;W[qb]
;B[ob]
;W[ra]
;B[sb]C[White die, but there is still aji.]
;W[qg]C[If white stone is here, white can live.])
(;AW[qg]LB[qg:A]
;B[rb]
;W[qb]
;B[ob]
;W[ra]
;B[sb]
;W[se]C[This is possible.]
(;B[sf]
;W[sd]
;B[rg]
;W[pa]C[W lives.])
(;B[rf]
;W[pa]
;B[rc]
;W[qd]
;B[sd]C[Ko, but black is not good])))
(;B[qb]C[This is bad answer.]
;W[re]
;B[rf]
;W[qd]
;B[qf]
;W[rb]
;B[pb]
;W[ra]C[white lives.]))
(;B[rd]C[Black can play from this direction.]
(;W[ob]
;B[nb]
;W[oc]
;B[od]LB[nd:A]C[There will be a aji at A.]
;W[rc]
;B[oa]C[White can not live in the corner.])
(;W[pc]C[Sometime this will make aji.]
;B[oc]
;W[rc]
;B[pb]C[White can not live. But..])
(;AW[qg]LB[qg:A]
;W[pc]
;B[oc]
;W[rc]
(;B[pb]
;W[qb]
;B[ob]
;W[qd]
;B[re]
;W[pe]
;B[od]
;W[qf]C[Black is captured.(ladder is good for white)]
;B[pf]
;W[oe]
;B[pg]
;W[qh]
;B[ne])
(;B[qd]
;W[ob]
;B[nb]
;W[oa]C[it will be ko]
;B[qa]
;W[ra]
;B[rb]
;W[sb])))
(;B[re]C[This is another answer.]
;W[ob]
;B[nb]
;W[oc]
;B[od]
;W[rb]C[Now two way to kill but both make bad ajis.]
(;B[oa]
;W[rd]
;B[qa]
;W[ra]
;B[sc]
;W[sd]
;B[sb]LB[nd:A]C[One way to kill, but cutting at  A is big aji.])
(;B[sc]C[this is the other way]
(;W[sb]
;B[oa]
;W[pb]
;B[qa]C[White died])
(;W[na]C[this is big aji.]
(;B[lb]C[If Black answer here, ]
;W[sb]C[White lives])
(;B[sb]
;W[mb]))))
(;B[ob]C[This is another way to kill.]
;W[re]
(;B[rf]
;W[rd]
;B[rb]
;W[qb]
(;B[qg]C[This is mistake]
;W[sb]
;B[sc]
;W[ra]C[ko])
(;B[ra]LB[qf:A][rg:B]C[White can not live in the corner but there are aji at A and B.]))
(;B[rd]C[This answer will lose some points.]
;W[rf]
;B[qd])))
(;AW[kc][qg]
;W[qc]C[What is the best for both?]
(;B[pc]
(;W[rd]
;B[re]
;W[pb]
(;B[ob]
;W[rb]
;B[pa]
;W[qa]C[Ko, but Black is more painful.])
(;B[rb]C[this is correct answer]
(;W[qb]
(;B[ob]
;W[ra]
;B[sb]
;W[se]
;B[sf]
;W[sd]
;B[rg]
;W[pa]
;B[qh]C[Black can play this way.])
(;B[rc]C[this is overplay]
;W[qd]
;B[sd]
;W[ra]
;B[sc]
;W[ob]
;B[nb]
;W[pe]))
(;W[ob]
;B[qb]
;W[nb]C[White get some points but Kote])))
(;W[re]C[this is normal for white.]
(;B[rd]
;W[rf]
;B[rc]C[normal for both])
(;B[rf]
;W[rd]
;B[qf]
;W[pb]
;B[ob]
;W[rb]
;B[pa]
;W[qb]C[corner is big]))
(;W[pb]C[if white play hane first, ]
(;B[ob]C[not good answer]
;W[rd]
;B[re]
;W[rb]C[ko])
(;B[rc]C[Complcate answer]
;W[rb]
;B[rd]
;W[ob]
;B[mc]
;W[oc]
;B[od]
;W[nd]C[If Ladder is good for white, this cutting make big Aji])
(;B[rb]C[good tesuji]
(;W[qb]
;B[rc]
;W[ob]
;B[nb])
(;W[ob]C[if white play here,]
(;B[qb]C[enough for black])
(;B[nb]C[greedy]
;W[rc]
;B[qb]
;W[sb]
;B[ra]
;W[qa]
;B[pa]
;W[oa]C[ko])))))
(;B[rd]C[not good answer]
;W[ob]
(;B[nb]
;W[oc]
;B[od]
;W[nd]C[headache for black])
(;B[oc]
;W[pc]
;B[nb]
;W[rc]
;B[pb]
;W[qb]
;B[oa]
;W[qd]
;B[re]
;W[pe]
;B[od]
;W[qf]C[black is captured(ladder is good for white)]))
(;B[re]
;W[ob]
(;B[nb]
;W[oc]
;B[od]
;W[rb]
;B[oa]
;W[nd]C[black is painful])
(;B[oc]
;W[pb]
;B[nb]
;W[rb]
;B[sc]
;W[sb]C[white lives]))
(;B[ob]C[possible answer]
;W[re]
;B[rd]
;W[rf]
;B[rc]))
(;B[qh]
;W[qj]
;W[lc]
;W[oj]
;W[ic]
;W[qc]C[What will be happened after this invation?]
(;B[rd]
;W[ob]C[not good])
(;B[re]
;W[ob]C[not good either])
(;B[pc]C[normal]
(;W[rd]C[not good ]
;B[re]
;W[pb]
;B[rb]C[black is enough])
(;W[re]C[possible move and hard to answer]
(;B[rf]C[If Black know the variations, it is possible to play.]
(;W[rd]
(;B[qb]C[this is mistake]
;W[qd]
;B[qf]
;W[rb]C[live])
(;B[pb]
;W[qb]
;B[se]
;W[qf]C[difficult to answer]
(;B[pf]
(;W[qg]
;B[rg]
;W[pg]
;B[ph]
;W[og]C[even if black can capture the corner, white can use the dead stone and get some profits])
(;W[rb]C[white can make ko as well.]
;B[sc]
;W[sd]
;B[qa]
;W[rg]
;B[qg]
;W[sf]
;B[qf]
;W[ri]
;B[rh]
;W[sh]C[ko]))
(;B[rg]C[fighting]
;W[pf]
;B[oh]
;W[nf]C[Some aji, but also it is difficult to decide the time to play at 3.3 for white.])))
(;W[qf]C[some positions, this cutting is possible]
(;B[pf]
;W[qd]
;B[qg]
;W[pb]
(;B[ob]
;W[rb]
;B[pa]
;W[qa]C[ko])
(;B[rb]LB[ob:A]TR[lc]C[if left side is perfect(A is not sente for white) for black, this move is possible]
;W[qb]
;B[se]
;W[ob]))
(;B[rd]
;W[pe]
(;B[se]
;W[qd]
;B[re]TR[nc]C[now there is not much to get for white because the marked stone is at good position ]
;AE[ic][lc][nc]AW[kc]AB[mc]TR[mc]C[if black is in this position, white can get some points.]
;W[nc]
(;B[nb]
;W[ob]C[possible])
(;B[nd]
;W[ob]
;B[pb]
;W[mb]C[White get some points]))
(;B[qd]
;W[rg]C[white get some points]
;B[qg]
;W[sf]
;B[pf]
;W[rh]))))
(;B[rd]C[not good answer]
;W[rf]
(;B[qf]
;W[rg]
;B[rh]C[overplay]
;W[qg]
;B[pg]
;W[ph]LB[qd:A]C[weakness at A makes white live]
(;B[og]
;W[qi])
(;B[pi]
;W[oh]
;B[qi]
;W[qd]))
(;B[rc]
;W[rh]C[black lost some points]))
(;B[qd]C[one way to answer]
;W[qf]C[white can play later]
(;B[pf]
;W[qg]
;B[pg]
;W[rh])
(;B[pg]C[not easy to play]
;W[pf]
;B[of]
;W[qg]
(;B[rh]
;W[ph]
;B[og]
;W[qi]C[black is captured])
(;B[ph]
;W[rh]
;B[ri]
;W[rg]
;B[qi]
(;W[rc]C[black lost many points])
(;W[rd]
;B[rc]
;W[qb]
;B[rb]
;W[pb]
;B[ob]
;W[oe]
;B[pe]
;W[nf]
;B[og]
;W[nd]
;B[oc]
;W[sf]C[Black is in trouble]))))))))
(;B[mc]
;B[qe])
(;B[lc]))
