(;B[qd]GM[1]FF[4]SZ[19]AP[SmartGo:2.5.0.0]CA[utf-8]
GN[WAGC_RD5_France-Czechia]
PW[Thomas Debarre, France]WR[5d]
PB[Ondrej Silt, Czechia]BR[6d]
EV[WAGC]RO[5]
RE[W+R]
US[NHK; transcribed by Chris Garlock]
AN[Michael Redmond 9P]
C[30th World Amateur Go Championship
Ecopa Arena, Fukuroi City, Shizuoka Prefecture, Japan
Round 5, May 29, 2009
W: Thomas Debarre 5d, France
B: Ondrej Silt 6d, Czechia
Commentary by Michael Redmond 9P, transcribed by Chris Garlock. Originally published on the International Go Federation’s Ranka Online: <http://ranka.intergofed.org/>

Sixteen-year-old Thomas Debarre 5d comes up with a new variation on a popular joseki played by top Japanese player Cho U in his 5th-round game against Ondrej Silt 6d of Czechia. “This is a completely new variation altogether,” says Michael Redmond 9P in his commentary on the game. “It's very interesting.” But Debarre falls behind in the opening, playing “too many moves in the small area,” says Redmond. Silt maintains his lead through move 89 when Debarre manages to generate a severe attack that threatens to either kill a large group or wipe out Silt’s side position. Silt rolls the dice, protects his side and, seven moves later, his group is dead. ]
;W[dp];B[dc];W[qp];B[op];W[mq];B[qq];W[qm]
C[W8 has been around for a while but it's still very popular; Cho U -- the strongest player in Japan -- likes to play it.]
;B[pp]
C[standard response at the moment];W[rp]
(;B[nq]
C[this is one of the moves that's been played to try to gain a move...see variation for b]
(;W[mr]
C[this is probably a new move; not one that I've seen, anyway.];B[rq];W[qj]
;B[jq]
C[this is a completely new variation altogether; it's very interesting. ]
;W[mo];B[gq];W[on];B[nr]
C[looks playable for B, who got the extension on the lower side. W's descent looked at threatening B, but W is left with a weak wall. But as a new variation it's interesting.]
;W[jo];B[cn]
C[my first instinct would be to play at b to squeeze the lower side and look at a pincer on B21]
(;W[dn]
C[this looks like it's giving B an oppty to play on both sides];B[dm];W[en]
;B[co];W[cp];B[eq];W[ep];B[cj]
C[and there you go; it turned out exactly according to B's plan, so it's bad for W already]
;W[er]
C[I don't see a point to moving out now; I'd be more inclined to play at b...]
(;B[ho];W[oc];B[lc];W[qc];B[rc];W[pd];B[qe];W[qb];B[qh];W[id]
C[Playing at b is a better flow of moves]
(;B[nd];W[pe];B[pf];W[of];B[pg];W[ne];B[me];W[mf];B[le]
C[even though it's pushing from behind, this seems like a better flow]
(;W[if];B[lf];W[mg];B[lg];W[mh];B[lh];W[mi]
C[B should break off and play at b now: he really wants to add to his moyo on the left while fighting in the center]
(;B[li];W[lj];B[kj];W[kk];B[jj]
C[W's been playing a lot of moves in the small area; it's important for B to squeeze from the left side (earlier)]
;W[de]
C[Provided W can connect up, this is going to be good for W];B[ee];W[ef]
;B[ed];W[ff];B[df];W[dg];B[cf];W[cg];B[be];W[bf];B[ce];W[jk];B[lk];W[mj]
;B[ik];W[il];B[hl];W[jm];B[im];W[jl];B[hk];W[fh]
C[this sequence is more or less W's plan, so I think W is playing fairly well here. W has gained by erasing B's potential on the left side with good shape, but B is maintaining his early advantage]
;B[gd];W[he];B[pj];W[pk]
C[I'd be inclined to play at b; te actual game play doesn't gain any territory. He erased the whole center but he doesn't gain very much and it's dangerous; I don't see any eyes for him. Plus B should be worried about a possible invasion at A]
LB[cl:A]
(;B[pi];W[ri]
C[This is a good move for W; he's making eyes while attacking B];B[ok];W[pl]
;B[nj];W[rb];B[rh];W[rd];B[re];W[sc]
C[Black can live at b but...]
(;B[mk];W[nl];B[nk]
C[Because of thinness below, not 100% clear W can kill with b]
(;W[iq]
C[W's now thinking at going after the center group and wants to strengthen his position in the center. Black, meanwhile, doesn't seem to have noticed. If B goes back and saves his group, the power side profit is more than enough, plus of course his profit from squeezing the group earlier]
;B[ip];W[jp];B[ir];W[kq];B[hq];W[oh]
C[now the group is just dead];B[oi];W[ni];B[og];W[nf]
C[If b was somehow sente, there might be a chance for life; see variation. No further comments]
(;B[ol];W[om];B[rj]
C[usually a tesuji that works, but...];W[rk];B[sj];W[qi];B[si];W[qk]TR[pe]
C[This works in tsume-go problems when the marked stone is a black stone...see variation]
(;B[mm];W[nm];B[lm];W[ml];B[ll];W[no];B[ob];W[sd])
(;B[rg];W[qf];B[sh];W[sf];B[se];W[rf]TR[pe]
C[If the marked stone is a black stone, it's seki and the answer to a well-know tsume-go problem. But in this case it's just dead.]
))
(;B[mm];W[ln];B[ol];W[nm];B[pm];W[pn];B[qk];W[ql];B[rk];W[rj];B[sh]
(;W[rl];B[se])
(;W[se];B[rf];W[qg];B[sj])))
(;W[oh];B[mm];W[nm];B[kn];W[jn];B[mn]
C[not completely clear, but definotely a less stable position for W]))
(;B[oh]
C[B can live like this but W has taken profit on all sides and can look at a big next move like A]
LB[fq:A]))
(;B[rj];W[qk];B[fq];W[dq];B[bo];W[bp];B[fr]
C[B's left side needs reinforcement, and this way he also puts pressure on W. This is also just big territorially. ]
))
(;B[gc];W[jc];B[li]
C[B can make an eye at A; ]LB[nc:A]))
(;W[lf];B[je];W[jg];B[ie];W[gd]
C[since all the pushes in the game wound up being forcing for B, this might be a better flow for W]
))
(;B[of];W[ne];B[oe];W[nd];B[je]
C[this looks easier for B; a better flow of moves]))
(;B[fr];W[dq];B[fq];W[dr];B[kr]LB[lp:A]
C[this leaves a weakness for W at A]))
(;W[fp]))
(;W[mp];B[rq];W[qj];B[jp]
C[speedier]))
(;B[or];W[jq];B[rq];W[qj]
C[this is joseki up through 14; many people say this is even but W has a better record because Cho U uses it and wins most of his games. B has lots of options at A, B, etc]
LB[ce:A][cn:B]))