(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
GN[sempre meglio ]PW[Igowin Pro]PB[User]WR[5k]BR[7k]DT[2015-04-16]
;B[pd]
;W[cq]
;B[pq]
;W[dc]
;B[qk]
;W[jq]
;B[jd]C[Is this the proper way to develop? 

--
Nothing wrong with it at all.  You could consider D15 or something, but I think it's a matter of choice.]
;W[nq]
;B[po]C[Is this necessary or tenuki? 

--

Fairly necessary, but you can almost always tenuki in the opening, provided you end with sente or destroy/gain as much as your opponent.]
;W[lp]C[This is slow on white's part.]
(;B[fc]C[Wrong direction.  This induces white to build on the much larger left side.  See variation]
;W[ed]
;B[fd]
;W[ee]
(;B[qg]C[I Belive this is a waste of time but i hate invasions and tried to strenghten my position. Where to play instead? 

--

Here, the top left is urgent.]
;W[ok]
(;B[mc]C[Same as before. 

--
This isn't urgent.
See variation.]
;W[pi]
;B[qi]C[Passive.  You don't want white's one stone to turn into a big wall while black only gets a few points on the side in what was black's area of influence.  This is related to the problem with playing N17 too.]
;W[ph]
;B[qh]
;W[gp]
;B[pl]C[Too slow.  Black needs to play on the left or fall behind.]
;W[ol]
;B[cj]C[Are this invasion correct? 

--

It's fine.  You could conceivably play one space lower, at C9.]
;W[pm]
;B[qm]
;W[pk]
;B[ql]
;W[ch]
;B[cm]C[A base... 

--
Good.]
;W[co]
(;B[dn]C[This strengthens white a lot.

See variations.]
;W[do]
;B[en]
;W[gn]
;B[fm]C[Is shape but i m overconcentrated.. Or not? 

--

Black's plays have been a bit heavy, so perhaps.  It depends on what black does with it, though.  Maybe it's just strength to play D13 or something.]
;W[gm]
;B[gl]
;W[hl]
(;B[el]C[Too slow.]
;W[gk]C[Painful for black.]
;B[fl]
;W[hk]
(;B[fe]C[This is a vital area, but playing this way make's white's very large corner stronger.]
;W[ff]
;B[gf]
;W[fg]
;B[gg]
;W[fh]
;B[gh]
;W[fi]C[Maybe better to expand the moyo on the right on reduce white now.]
;B[gi]
;W[of]C[A blunder i Belive.. Isn't it?

--

Looks reasonable to me.  Black's new wall wont make that many points, and it opens up more aji in the corner.]
;B[fj]
;W[gj]
;B[fk]
;W[ej]
;B[ei]
;W[eh]C[???

White should just capture with D11 instead.]
;B[di]
;W[dh]
;B[ci]
;W[bi]
;B[bj]
;W[bh]
;B[ec]
;W[db]
;B[eb]
;W[dd]
;B[eo]
;W[ep]
(;B[bn]C[I Belive its a mistake but where to play? 

--
See variations.]
;W[bo]
(;B[cn]C[Too slow.  Take sente.]
;W[pg]
;B[pf]
;W[og]
;B[pe]
;W[ne]
;B[kf]C[Is this way the correct developement? Maybe something like n15? 

Black is behind on points and potential, so he needs to concentrate on reducing white's potential before building his own.  See the reduction moves earlier]
(;W[mg]C[Too slow.]
;B[lg]
;W[mh]
;B[lh]
;W[li]
;B[ki]
;W[kj]
;B[lj]
;W[mi]
;B[jj]
;W[kk]
(;B[jh]
;W[jk]
;B[ij]
;W[hi]
;B[hj]
;W[ii]
;B[ji]
;W[or]
;B[pr]
;W[fo]
;B[fn]
;W[om]
;B[nd]
;W[me]
(;B[md]C[Ok empty triangle and its bad but what to play? What plan? ]
;W[le]
;B[kd]
;W[ke]
;B[je]
;W[jf]
;B[jg]
;W[if]
;B[ie]
;W[lf]
;B[kg]
;W[no]C[Too late now.]
;B[op]C[This just helps white.]
;W[np]
;B[pj]
;W[oj]
;B[qj]
;W[hm]
;B[ik]
;W[il]
(;B[ai]
;W[ah]
;B[aj]
;W[ps]
;B[qs]
;W[os]
;B[qr]
;W[ao]
;B[an]
;W[oq]
;B[pp]
;W[on]
;B[pn]
;W[ea]
;B[fa]
;W[da]
;B[oe]
;W[mk]
(;B[oo]
;W[]
;B[])
(;B[ld]C[This was left at the end, how was the game scored?]))
(;B[ao]C[This one is sente, so take it first.]))
(;B[no]C[Reduce!]))
(;B[jk]C[Must keep going.]
;W[ji]
;B[ii]
;W[kh]
;B[jh]
;W[ki]
;B[ij]))
(;W[ki]C[I don't know what white does now.])
(;W[nc]C[This attachment is really annoying too.]))
(;B[]
(;W[cn]
;B[bm]C[Is this so dire?])
(;W[an]
;B[am]
;W[ao]
;B[]
;W[cn]
;B[bm]C[Or this?])))
(;B[no]C[Start reducing white's center potential, which is big.])
(;B[kj]C[Maybe reduce around here?]))
(;B[dg]C[If black's group is alive (or alive enough) this asks how white wants to treat his stone.]
(;W[cg]
;B[df]
;W[ce]
;B[dh]C[Now white's a lot smaller.])
(;W[dh]
;B[eg]
;W[eh]
;B[fg]
;W[bf]
;B[fe]C[Now black has accomplished more.])))
(;B[hk]C[Risky, but maybe possible.])
(;B[gk]C[Better than the game.]))
(;B[em]C[This may leave a bit more aji on the bottom.])
(;B[ej]C[I also considered this, but I think the bottom is more solid than the top, so I don't want to help white help the top.]))
(;B[pm]C[Builds territory and requires response from white.])
(;B[ck]C[I have a moyo and you don't.]))
(;B[gf]C[Consider this, for example, which expands black's moyo and also limits white's potential on the left.])
(;B[pf]C[Locally, I like this better.]))
(;B[de]C[Now, the side white wants to develop is broken up by black's stone, and white won't get too much on the top either because of K16.]))