(;CA[utf-8]ST[2]RU[Japanese]GM[1]AB[pd][dp]C[Honinbo Dosaku (1645~1702) was by far the strongest player of his time, and is still considered to be one of the strongest players in Go history. He made important contributions to Go strategy for the opening, laying the foundations for the following golden period of progress for Go. In this game that was played in 1670, we will see a sequence that is quite similar to something Master played in game 22 and 48 of the 60 game set played from 2016-12-29 to 2017-1-3. 
]
AP[CGoban:3]SZ[19]FF[4]DT[1670-03-17]PC[The KGS Go Server at http\://www.gokgs.com/]
PB[Kikukawa Yuseki]BR[5p]PW[Honinbo Dosaku]WR[9p]KM[0]RE[W+Resign]MULTIGOGM[1]
;W[oq]C[In 1670, Dosaku was already the strongest player, but was not yet officially recognized as so. His teacher, Honinbo Doetsu, was in the middle of a 20 game challenge match with Yasui Sanchi, who was Meijin at that time. Dosaku is said to have given valuable advice to Doetsu in this match that eventually gave leadership of the Go community to the Honinbo school. Sanchi lost the position of Meijin in 1675, and it was given to Dosaku. ]
;B[cd]C[Kikukawa Yuseki was a 5P of the Honinbo school, but little else is known of him. Only a handful of pros could play Dosaku with sen (black), so it is not unusual to see a fairly strong pro taking two stones. ]
;W[ec];B[hc];W[cn];B[gq]C[At the time of this game, the ogeima at 6 was the default joseki move for Black when White plays a kakari at 5. ]
;W[qf];B[mc]TR[nd]C[Black 8 might look a bit strange to a modern Go player, in that it looks too low and we would probably play at the marked point. Our modern Go theory was given a jump start by Honinbo Dosaku, and we have the advantage of 350 years of progress after that. His opponents had no way to know, until Dosaku gave them some textbook examples. ]
;W[ch];B[dc];W[iq];B[cq]
(;W[hd]TR[ec]C[Dosaku ofter played light moves such as this. When the marked stone is going to be a liability, he tries to find a way to sacrifice it (see var). ]
(;B[id]TR[ec]C[It is correct that Black refuses to go after the marked stone. ]
;W[de]C[The exchange of 13 for 14 has made this pressing move feasible (see var). ]
(;B[ce]C[Black plays calmly, refusing to pick a fight that White has prepared for. ]
;W[db]C[Why does Dosaku get to push his opponents around like this? See the variation. ]
(;B[cb]C[Black calmly takes the corner territory. ];W[ie]TR[df]C[All the necessary forcing moves on the left have been played and the stage is set for White to play at the marked point. Now White can finally force from the center. ]
;B[ic];W[df]TR[dk]C[Black has played no bad moves, but already it looks like White has gained something. White has a fairly strong group in the upper left, and that helps to reduce the value of a Black invasion at the marked point. ]
;B[je]C[Throughout this sequence, White was always ready for Black to attempt an attack. White's choice of shapes at 13 and 15, and the ability to control the flow is very similar to Master's play in games 22 and 48 of the 60 game set. ]
;W[qc]TR[mc]C[Now we can see that the marked stone is poorly positioned too far away from the corner. Dosaku controlled the play on the left to emphasize this negative aspect. ]
;B[qd];W[pc];B[oc];W[ob];B[nc];W[rd];B[re];W[rc];B[qe]TR[qf]C[The sequence to 32 was a common joseki at the time, and is still seen in modern Go. White has scooped out the corner and prepared to sacrifice the marked stone. This sets up for the next move with which White controls the center. ]
(;W[jf]TR[hd]C[This is a mind blowing move. Dosaku seems to have had the whole sequence planned out when he played 13 (marked). ]
;B[he];W[if];B[gd];W[gg]TR[ec]C[Even the marked stone is connected for now, so White has not lost much territory while playing so lightly to control the center. ]
;B[po];W[qk]TR[oq]C[Dosaku liked to play this point on the side, and has played the mini- Chinese fuseki shape in some of his games. Remember, this was about 350 years ago! White 39 is very unusual when White's corner stone (marked) is on the 5-3 point. ]
;B[qq];W[no];B[qm];W[eo]C[Dosaku makes the most of his thickness in the center by playing 41 and 43 on the 5th line. ]
;B[nm]C[Black 44 is an important point to reduce White's potential in the center and set up an attack on the right side. ]
;W[gp];B[fq];W[ke]TR[rf]C[Dosaku rejects the idea of protecting at the marked point. He hopes to sacrifice on the right and build in the center. ]
;B[qh];W[nk];B[nn];W[oo];B[pn];W[oh];B[ck]C[After playing solidly in the opening, now Black invades deeply. Black has no other weak groups, so he must be confident that he can live with this group and scrap the White moyo. ]
;W[ek];B[cm];W[do];B[el];W[dl];B[dm];W[em];B[fl];W[dk];B[en];W[ep]C[Black must be careful here (see var). ]
(;B[dr]TR[cp]C[Black 66 is a sharp move. Now White cannot play the marked point with sente. ]
;W[cl];B[bm];W[fm];B[fn];W[gm];B[dn];W[gn];B[co];W[ll]C[Locally, the left side fight seemed to go well for Black, but White's center is intact, so White's play worked well with the board position. ]
;B[ln];W[lp];B[hq];W[qg];B[mf];W[oe];B[ne];W[fb];B[bg];W[kc];B[kb];W[ip];B[mo];W[mp]
;B[km];W[kl];B[im];W[hl];B[mh];W[ng];B[lf];W[nf];B[pf];W[pg];B[me]TR[od]C[With 98, Black has removed trhe threat of White cutting at the marked point. ]
;W[kh];B[lh];W[qr]C[White has a small lead at this point. ];B[pq];W[pr];B[or]C[By cutting at 106, Black took a huge loss in the corner. Since White was already ahead, I assume that Black was making ko threats for a final desperate attempt to turn the game around with a ko on the right side. ]
;W[rr];B[qj];W[pk];B[rk];W[rl];B[ri];W[sk];B[sj];W[rj];B[nq];W[op];B[rk];W[cp];B[bp]
;W[rj];B[nr];W[np];B[rk];W[jb];B[sl];W[lb]C[After this trade, White is far ahead. ]
;B[oi];W[ki];B[nb];W[dd];B[cc];W[se];B[od];W[rf];B[pb];W[qb];B[oa];W[pi];B[pj];W[oj]
;B[ni];W[ph]LB[of:A][qi:B]C[White is alive with A or B. Black can only resign at this point. ])
(;B[eq];W[cp];B[dq];W[fm]C[If White can force with 2, then Black has a painful situation after White escapes at 4. ]))
(;W[he];B[jf]C[Connecting at 1 is a heavy move, and allows Black to control the center with 2. ]))
(;B[df]TR[id];W[gc];B[ic];W[cb]TR[hd][id]C[Black is tempted to counter with 1, the 'kiai' (fighting spirit) move. Again the marked exchange comes into play when White covers at 2 to make some eye space. White 4 is a large move, and this is good for White. ]))
(;B[dd];W[ed];B[ee];W[ce];B[be];W[bd];B[bc];W[db];B[ad];W[gd]TR[hd][id]C[The marked exchange works as a kikashi for White.]
;B[df];W[ic]TR[hd][id]C[Black's strongest response is to cut and fight with 1-5. The marked exchange gives White the cut at 12 after pulling back at 10. Locally this trade is good for White. ]))
(;B[ed];W[fd];B[fc];W[gc];B[eb];W[fb];B[ec];W[ic]LB[dc:A]C[This is ideal for White. Black's UL corner was already alive with the play at A, so White can allow hime to enlarge that territory while getting a good position on the upper side. ]))
(;W[ed];B[cf];W[eg];B[dk]C[Extending at 1 is heavy, and creates an eyeless group. After Black 4, White has a difficult fight. ])
(;W[de]LB[dd:A]C[This being the move that Dosaku wants to play, he prepares with an attachment on the right first to be able to refute Black's strong response at A. ]))