Today, 16 of january, is a twelfth anniversary of his death.
When I was studying in Mexico (july of 2013-june of 2014), in "Dia de muertos" (pays tribute to the deceased), one friend and me replay his game with Yoda Norimoto. I want share you his game now, because I think that it is a beautiful game and I learned a lot with it (only I can say that I love move 73, I knew it thanks to Hans).
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[5.50]
PW[Yoda Norimoto]PB[Hans Pietsch]WR[9d]BR[1d]DT[1997-06-27]EV[2nd LG Cup]RO[Round 1]PC[Seoul, Korea]SO[http://gogameguru.com/]AN[An Younggil 8p]C[This is a game from 1997 between Hans Pietsch 1p (at the time) and Yoda Norimoto 9p, from the 1st LG Cup.
Hans Pietsch was a German Go player who became a professional at the Nihon Kiin (the Japanese Go Association) in 1997.
That year, while still a 1 dan professional, Hans defeated Yoda Norimoto 9p in the 1st LG Cup in Korea.
Tragically, Hans was shot by robbers in a random act of violence, and died shortly afterwards, on January 16, 2003. He was on a trip to promote Go in South America at the time.
The Nihon Kiin posthumously promoted Hans to 6p.
January 16, 2013 was the 10th anniversary of Hans' death. One of his German friends asked for this game to be commented in memory of Hans. Many Go players remember Hans' cheerful nature and warm heart.
You can read more about Hans Pietsch here:
http://gogameguru.com/])
(;B[li]C[If black doesn't answer at the bottom, ]
;W[ir]C[White can play like this. ]
;B[hs]
;W[jp]
;B[iq]
;W[ko]
;B[jo]
;W[lo]
;B[ip]C[Since there's no particularly big endgame move now, this should be better for black.]))
(;B[cp]
;W[co]
(;B[br]
;W[cq]
;B[bq]
;W[cr])
(;B[dq]
;W[br]))
(;B[br]
;W[cq])
(;B[cq]
;W[br]))
(;W[rh]C[White really wants to play here, but]
;B[cp]
;W[co]
;B[dq]C[This is good move, and white can't manage the situation. ]
;W[br]
;B[ep]
(;W[fp]C[If white ataris on the outside,]
;B[do]
;W[eo]
;B[dp]
;W[fq]
;B[ap]C[Blocking here is good, and white can't kill this corner without a ko.]
;W[ds]C[If white tries to kill, ]
;B[cs]
;W[cr]
;B[es]LB[bs:B][fs:A]C[ A and B are miai for black now. ]
;W[fs]
;B[bs]LB[gd:B][ps:A]C[It's a ko, but black has more big ko threats, starting with A and B. It's unbearable for white.])
(;W[do]C[If white connects, ]
;B[es]
(;W[cq]
;B[fs]C[White loses too many points here. ])
(;W[fs]C[White doesn't have enough liberties to play here,]
;B[fq]
;W[ds]
;B[gs]C[Black would capture white's stones like this.]))))
(;W[cr]C[White can't play here now. ]
;B[cq]
;W[br]
;B[er]
;W[fq]
;B[fs]C[Because black can connect under in sente, and]
;W[dq]
;B[ri]C[Black can even play here now. It's a big loss for white. ]))
(;B[gq]C[If black just extends here, ]
;W[rh]C[White can still play here. ]
;B[dr]
;W[cr]
;B[cq]
;W[br]
;B[dq]C[If black tries to fight, ]
;W[er]
;B[co]
;W[cp]
;B[ep]
;W[do]C[It doesn't work well for black.]))
(;W[rh]LB[gr:A]C[If white doesn't answer A,]
;B[dr]
;W[er]
;B[cp]
;W[co]
;B[dq]
;W[br]
;B[ep]
;W[do]
;B[es]
;W[cq]
;B[fq]C[It's a big loss for white.]))
(;B[gq]C[If black plays here, ]
;W[fr]
;B[gr]
;W[rh]C[White can play here which is very big. ]
;B[dr]C[If black comes into the corner here, ]
;W[cr]C[This attachment is good. ]
;B[cq]
;W[br]
;B[er]
;W[dq]
;B[fq]C[Black can capture the single stone, but ]
;W[qg]
(;B[pg]
;W[rf]C[This is troublesome for black. ])
(;B[rf]
;W[pg]C[White is winning now.])))
(;B[cg]C[Black should be careful not to answer here. ]
;W[eh]
;B[ch]
;W[ee]
;B[ef]
;W[ff]C[If this happens, black will be in big trouble.]))
(;B[ef]
;W[dg]
;B[ch]
;W[ff]
;B[eh]
;W[fg]
;B[fh]
;W[gh]C[This is troublesome for black.]))
(;B[jf]C[This move should be better. ]
;W[li]
;B[em]LB[je:A][mf:B]C[There's no problem in the center area. Connecting at A isn't sente for white, because B is sente for black.]))
(;W[ld]C[If white tries to cut,]
;B[md]
;W[me]
;B[lf]
;W[lc]
;B[lb]
;W[kd]
;B[nc]
(;W[od]
;B[ne]
;W[mf]
;B[oe]
;W[mg]
;B[kb]C[Black will gain a lot of territory in the top right.])
(;W[ob]
;B[na]
;W[ne]
;B[od]
;W[ng]
;B[kb]
;W[qb]
;B[pa]C[White stones in the top right are captured after this tesuji.])))
(;B[od]C[If black tries to kill white like this, ]
;W[qb]
;B[rc]
;W[nc]
;B[nd]
;W[mb]
;B[lb]
;W[md]
;B[lc]
;W[ma]
(;B[oa]
;W[ob]
;B[pa]
;W[pb]
;B[na]
;W[ld]C[Black finds himself short of liberties.])
(;B[ld]
;W[rb]
;B[sb]
;W[ob]LB[me:A]C[This isn't a good result for black. Black still needs to play at A later.]))
(;B[qb]C[In this case, this extension isn't the proper move.]
;W[od]
;B[me]
;W[pe]
;B[qd]
;W[ne]
;B[mf]
;W[og]C[It's impossible for black to keep attacking this white group. ]))
(;W[em]C[White should take this stone first.]
;B[kd]
;W[je]
;B[oc]C[If black reinforces the corner,]
;W[ei]
;B[dh]
;W[hl]C[This connection is sente, and ]
;B[mh]
;W[hq]C[This extension is big, and the game's pretty even.]))
(;B[dj]C[This hane here is common, but]
;W[dl]
;B[cj]
;W[pc]C[White can tenuki and come in here.])
(;B[cj]C[This extension should be right. ]
;W[cl]
;B[dj]
;W[ek]
;B[kd]
;W[je]
;B[oc]C[Black can secure the corner now, and black's still ahead.]))
(;W[jp]C[If white cuts here to fight, ]
;B[lp]C[This connection is a good answer, and]
;W[mq]
;B[ip]
;W[jo]
;B[io]TR[jo][jp]C[White can't save the two stones.]))
(;B[lq]C[If black threatens to kill white's group at the bottom,]
;W[qn]LB[po:A]C[White wouldn't care, and would win the ko. Black can't capture white because of the weakness at A.]))
(;B[qk]C[If black ends the ko,]
;W[ij]C[This ponnuki is priceless.]
;B[lp]C[If black attacks this white group next,]
;W[mq]
;B[qr]
;W[lq]LB[jp:A]C[This is sente because of the cutting point at A,]
;B[jp]
;W[oq]LB[ik:A][ql:B]C[And, white can live like this. This trade is no good for black. A is more valuable than B.]))
(;B[pl]C[Black should take the ko.]
(;W[hk]
;B[ij]
;W[pm]C[If white plays like this, ]
;B[jq]C[Then black can come back here.]
;W[rm]C[White can't cut here now. ]
;B[pl]C[Because white doesn't have a big enough ko threat now.])
(;W[jq]C[If white tenukis and plays here, ]
;B[qk]C[Black can just eliminate the ko, and it's good enough for black. ]
;W[li]
;B[lh]
;W[mi]
;B[ck]C[Black has more territory, and the game is simple and easy.])))
(;W[jk]C[Coming out to the center is far more important. ]
(;B[ik]C[If black keeps going, ]
;W[il]
(;B[hk]
;W[jm]LB[mn:A]C[White can make a good shape. Black needs to reinforce here because of the threat of A.])
(;B[jl]C[This cut isn't a good idea. ]
;W[mm]
;B[mn]
;W[ml]
;B[ln]LB[jm:A]C[Black has to connect here, otherwise white will capture the cutting stone with A.]
;W[nn]C[White can cut in sente, and]
;B[nl]
;W[li]C[Even if white plays simply like this now,]
;B[lh]
;W[mi]LB[kh:B][ij:A]TR[jl][lm][ln][mn][kp][mp]C[White can live on the right side, so black's marked stones are in danger and there are cutting points at A and B.]))
(;B[je]
;W[jf]
;B[if]C[If black pushes through and cuts here, ]
;W[lb]
;B[lc]
;W[oh]C[This attachment is good. ]
;B[og]
;W[nh]C[And now, black can't make a big territory in this area.])))
(;W[qj]TR[qf][pn]C[When there's not enough space for a two-space extension, splitting on the 4th line (as in the game) is better.]
;B[ql]LB[qh:A][pj:B][qj:C]C[White can only extend one-space at A, so white played at B instead of C.]))
(;B[pj]C[If black plays something like this,]
;W[nm]
;B[pl]
;W[eq]C[Now white's framework at the bottom becomes deeper and black's right side doesn't have much future potential.]))
(;W[qq]C[This would be more common. ]
;B[pq]
;W[qp]
;B[po]
;W[pr]
;B[or]
;W[qr]
;B[oq]
;W[qn]
;B[fq]
;W[dq]
;B[ip]C[It's another game.]))
(;W[qn]C[This approach is normal from today's point of view.]
;B[nq]
;W[rp])
(;W[nq]C[This is also possible, but then]
;B[pn]
;W[jp]
;B[ke]C[This jump is very good. ]))
(;W[qn]C[If white tenukis and plays something like this,]
;B[nq]
;W[rp]
;B[gc]C[Black can invade here and,]
;W[gd]
;B[hc]
;W[hd]
;B[ib]
;W[id]
;B[jb]
;W[fc]
;B[qf]C[This is good for black.]))
Source of game:
https://gogameguru.com/go-commentary-ha ... st-lg-cup/Commented game by Younggil An