My comments are embedded below. You played better than he did up to move 43, and probably had a won game, but you made major strategic decisions the wrong way at moves 43 and 69.
At move 69, remember that a cut between two safe groups is meaningless.
At move 98, your problems are the direct result of move 69, and to a lesser extent, of move 43.
(;GM[1]FF[4]AP[glGo:1.4]ST[1]SZ[19]KM[-5.5]PW[yasuhiro99]WR[11k+]PB[Hensch]BR[12k+]RE[W+16,5]TM[600]DT[2010-12-03]PC[IGS-PandaNet]CP[Copyright (c) PANDANET Inc. 2010]C[READ MORE OF JOAZ'S COMMENTS HERE. ];B[pd]C[yasuhiro99: Hi!];W[dp];B[pq];W[qo];B[op];W[pl]C[JB: This is not joseki...TTBOMK];B[qj]C[JB: Hitting one of two weak points. That is good. But i suspect that the other weak point - R4 - is bigger. ( Corners before sides, right? )
He could play S3, and you would have to defend with something like M3.];W[jp]C[JB: Now you must play R4.];B[lq]C[JB: This is solid, but passive. Whereas R4 is just as solid, and it hurts white.];W[gq];B[qp]C[JB: Good!
];W[po];B[rp];W[ro];B[cd]C[JB: Ok, time for some tewari analysis. We'll switch the order of moves around. Let's remove moves 9 and 10, and see what the board looks like.
If the board were like this, with the two Xed-out stones gone, and he played his at G3, would you then play at M3?
Of course not. It is relatively small, and your corner does not need defending. You would play something like D10 or E17 or K16. This demonstrates that M3 is out of place.
In the Shusaku joseki ( Q3/P4 ), something near R4 and something near M3 are miai. You usually only need one to ensure life. If you play both too early, you are making your group overly strong at the expense of bigger moves elsewhere.]MA[lq][gq]CR[jd][dj][ec];W[dj];B[ic];W[nc];B[pf];W[kc];B[ie];W[ec];B[de];W[fe];B[ch];W[cm];B[cq];W[cp];B[dq];W[eq];B[bp];W[bo];B[bq];W[co];B[er];W[fr];B[ds];W[cr];B[br];W[jj]C[JB: At this point, white has tossed down the guantlet. He is allowing you all four corners, and has announced that he intends to take much of the middle. Your future strategic decisions must take this into account. ];B[dc];W[gc](;B[ld]C[JB: Here, IMHO, is where your game goes wrong in a major way. White has power in the middle. If you start a running fight, you must keep this in mind. By starting this sequence, you are commiting yourself to a weak group that has to live in the face of his center power. See variation. ];W[lc];B[md];W[mc];B[nd];W[kd];B[ke];W[je];B[jf];W[jd]C[JB: Too many weaknesses, and you have to abandon your once-dangerous pincer stone.];B[kf];W[id];B[he];W[hd];B[hg]C[JB: You have spent the last four moves playing what may turn out to be dame, while he is connecting two formerly weak groups to form unassailable territory.
];W[qc];B[qd];W[pc];B[rc];W[od];B[oe];W[oc];B[oj];W[nl];B[lo];W[mf](;B[le]C[JB: So he threatens two cuts? If you are strong on both sides of a cut, the cut is meaningless. You are already safe in the upper right corner, so strengthen your middle group and laugh while he cuts. See variation.];W[mh](;B[nf]C[JB: This is the second point where black makes a major strategic misjudgement. White has declared an intent to have center strength, and you areletting him have it while defending against empty threats.
You are letting a weak group continue to pretend to threaten your strong group. See variation.];W[mj]C[JB: Now you have problems. White has strengthened his weak group by bluffing you, and now it is strong enough to endanger your right side stones.];B[hj]C[JB: Finally the right idea!
But it may be too late.];W[hi];B[gi];W[gj];B[hk];W[ii];B[fj];W[gk];B[fk];W[gl];B[ei];W[fl];B[dk];W[dl];B[ck];W[gh];B[fi];W[hh]C[Ok, you had one successful reduction, and grabbed some territory while doing it. Now try something like K5.
BTW, this would all be so much easier if N10 was a black stone, played there instead of O14.]TR[mj][nf][jo];B[rl];W[kn]C[JB: He sees the weak spot first
];B[jr];W[iq](;B[qb]C[JB: See variation];W[pb];B[rb];W[pi]C[JB: You let his group become strong, and now the chickens come home to roost. The problem is not at move 98, it was well before then.
**** END COMMENTS ****]TR[mf][mh][mj];B[oi];W[pj];B[pk];W[qk];B[ok];W[qi];B[ol];W[rj];B[om];W[pm];B[nm];W[ml];B[rg];W[rh];B[qg];W[oh];B[mm];W[lm];B[eb];W[fb];B[db];W[ko];B[lp];W[on];B[no];W[ir];B[kr];W[eg];B[dh];W[dg];B[cg];W[cl];B[bl];W[bm];B[so];W[sn];B[sp];W[rn];B[ed];W[fd];B[fc];W[ee];B[ec];W[gb];B[gg];W[ig];B[if];W[jg];B[kg];W[kh];B[ng];W[mg];B[nh];W[ph];B[mi];W[li];B[ni];W[mk];B[df];W[ef];B[sh];W[si];B[sg];W[bk];B[bj];W[al];B[cj];W[aj];B[ai];W[bi];B[ak];W[dr];B[cs];W[aj];B[ge];W[ah];B[gd];W[fh];B[af];W[hc];B[bh];W[ak];B[qh];W[ri];B[is];W[hs];B[js];W[fs];B[ao];W[an];B[ap];W[ek];B[ci];W[ai];B[ag];W[ej];B[eh];W[fg];B[ln];W[kp];B[pa];W[oa];B[qa];W[nn];B[mn];W[oo];B[pp];W[ql];B[rk];W[rm];B[pg];W[og];B[of];W[me];B[ne];W[lh];B[fa];W[ga];B[ea];W[es];B[dr];W[jq];B[kq];W[ll];B[gf];W[el];B[cf];W[di];B[tt];W[tt]C[Mit dem 'score' Befehl können die Punkte überprüft werden, mit 'done' wird das Spiel beendet.
Mausklick markiert Gruppen als tot und entfernt sie vom Bret
;B[tt][Game 362 yasuhiro99 is removing @ H9
Game 362 yasuhiro99 is removing @ S8
Game 362 yasuhiro99 is removing @ J17
Hensch: Thank you for the game!
You have typed done.
yasuhiro99: 83.5 to Hensch: 67.0
yasuhiro99: Thank you for the game.]TB[aa][ab][ac][ad][ae][aq][ar][as][ba][bb][bc][bd][be][bf][bg][bs][ca][cb][cc][ce][cr][da][dd][hf][ks][lr][ls][mo][mp][mq][mr][ms][np][nq][nr][ns][oq][or][os][pe][pr][ps][qe][qf][qq][qr][qs][ra][rd][re][rf][rq][rr][rs][sa][sb][sc][sd][se][sf][sq][sr][ss][aa][ab][ac][ad][ae][aq][ar][as][ba][bb][bc][bd][be][bf][bg][bs][ca][cb][cc][ce][cr][da][dd][hf][ks][lr][ls][mo][mp][mq][mr][ms][np][nq][nr][ns][oq][or][os][pe][pr][ps][qe][qf][qq][qr][qs][ra][rd][re][rf][rq][rr][rs][sa][sb][sc][sd][se][sf][sq][sr][ss]TW[am][bl][bn][cn][dm][dn][do][em][en][eo][ep][fm][fn][fo][fp][fq][gm][gn][go][gp][gr][gs][ha][hb][hj][hk][hl][hm][hn][ho][hp][hq][hr][ia][ib][ic][ih][ij][ik][il][im][in][io][ip][ja][jb][jc][jh][ji][jk][jl][jm][jn][jo][ka][kb][ki][kj][kk][kl][km][la][lb][lj][lk][ma][mb][na][nb][ob][pn][qj][qm][qn][rk][rl][sj][sk][sl][sm][am][bl][bn][cn][dm][dn][do][em][en][eo][ep][fm][fn][fo][fp][fq][gm][gn][go][gp][gr][gs][ha][hb][hj][hk][hl][hm][hn][ho][hp][hq][hr][ia][ib][ic][ih][ij][ik][il][im][in][io][ip][ja][jb][jc][jh][ji][jk][jl][jm][jn][jo][ka][kb][ki][kj][kk][kl][km][la][lb][lj][lk][ma][mb][na][nb][ob][pn][qj][qm][qn][rk][rl][sj][sk][sl][sm])(;B[ni];W[mi];B[rb]C[JB: Play strong, and keep sente!]))(;B[li]C[JB: This will probably end badly for white. He has one very weak group, and one semi-weak group. You should be able to kill one of them, or let them live and build strength while chasing them and then use that strength to invade his center territory.](;W[ne]C[JB: He can't cut, or you kill.];B[nf];W[me];B[mg];W[lf];B[lg])(;W[mi];B[mj](;W[lj];B[mk]C[JB: It looks like something is going to die.])(;W[nj];B[nk];W[lj];B[ni]C[JB: This looks bad for black too.]))))(;B[lh];W[le];B[ne];W[mh];B[mi]C[JB: This will end badly for white]))(;B[ig]C[JB: Make yourself stronger first. Now you are threatening attacking moves like P17 and F13, and invasions like H10 or J9.]TR[oc][fg][hj][ik]))