(;GM[1]FF[4]SZ[19]AP[SmartGo:3.0.1]CA[utf-8]
GN[2017.04.13-Dosaku2-edited-final]
PW[Honinbo Dosaku ]
PB[Yasui Chitetsu]
DT[1670-09-18]
PC[The KGS Go Server at http://www.gokgs.com/]
RU[Japanese]ST[2]
C[Commentary by Michael Redmond 9P
In this game from 1670 Honinbo Dosaku plays White against Yasui Chitetsu, his major rival in the Yasui house. In this game I will comment on Dosaku's brilliant sabaki in the early middlegame, in a position that I find to resemble the way Master invaded the Chinese opening in games 22 and 48. ]
MU[1];B[qd];W[oc];B[lc];W[qo];B[dq];W[co]
C[Dosaku liked to play the 5-3 point, and often could force his opponents into over-concentrated shapes. The var for Black's next move shows an example]
(;B[cl]
C[Black's 2-space pincers at 3 and 7 were still the most popular move at the time of this game, while members of the Honinbo school were starting to play 3-space pincers. High pincers on the 4th line were not being played yet. ]
;W[ce]
(;B[ep]
(;W[jq]
C[White puts a high value on the side with White 10. This actually works fairly well with White 4, and can be seen in modern Go (see var). ]
(;B[oq]
C[Black plays a simple joseki, keeping the game peaceful.];W[qq];B[lq];W[gq]
C[In modern Go, Black usually plays a kosumitsuke in the corner (see var). ]
(;B[dn];W[dc]
(;B[hc]
C[This extension seems to be out of focus, but since Chitetsu played it a number of times, I would suppose that he had reasons to like it. ]
;W[qi]TR[no];B[pc]
C[The upper side is big, but how should White handle it. Dosaku was very good at avoiding to make a heavy group, and while he was flexible, his plays also put pressure on the opponent, keeping the initiative (see 2 vars)]
(;W[pe]TR[jc]SQ[lc]
C[White presses immediately, aiming to invade at the marked point later (see var). ]
(;B[pd]
C[After playing this strong move, Black is committed to fight here (see var). ]
(;W[ld]SQ[pe]
(;B[od]TR[oc][pe]
C[Black takes profit in the upper right, this being the 'kiai', or fighting spirit move. Since Dosaku wanted to play lightly here, sacrificing the marked stone was a part of his original plan. ]
;W[kc];B[mc]
(;W[lb]
C[White makes full use of the sacrifice, forcing once more with 26. Black must answer this (see var). ]
(;B[mb];W[ie]
C[The 26-27 exchange adds resilience to White's shape (see var). ]
(;B[ec];W[ed];B[db]
C[Black 29 to 31 is the tesuji for sabaki. ];W[fc];B[eb];W[cc];B[fb];W[gd]
;B[id];W[je];B[gc];W[fd];B[ci]
C[Black lives with sente and takes the final large point. Both players have handled this first fight well. Black took the cash, while White has potential towards the center. Black's territory is mostly in the upper right, and it is important to note that there is still potential for White to invade the lower left area. ]
;W[ib];B[cb];W[no]
C[White starts to expand the right side. ];B[lo]
C[White should now strengthen his weak group while attacking Black (see var). ]
(;W[mp];B[lp];W[nr]
C[With 46 and 48 Dosaku got greedy. This attack backfired when Black got to attack White's lower side group first. ]
;B[jo]TR[io]
C[Black 49 is the natural move, although I would have trouble choosing between this move and the marked point. ]
;W[go];B[hp];W[hq];B[ip]
C[Simple but powerful moves seem to be the trademark of the Yasui house. Black 53 is a double threat (see var). ]
(;W[dr]
C[As a tesuji, this move is spectacular. The drawback to this move is that White is going to lose any potential on the left side. ]
;B[er];W[fq];B[cr];W[kr];B[lr];W[mr]LB[gp:A]
C[Using the tesuji of 54 to get an extra stone at 56, White has reduced the value of Black A, and created the opportunity to protect the side with 58 and 60. ]
;B[gp];W[fp];B[fo];W[ls];B[fn]
C[As they say, the operation was a success. White used the tesuji at 54 to get out of a difficult situation, but the cost was that Black now has a sizable territory on the left side with no potential at all for White to invade. ]
;W[mm];B[pj]
C[Black plays the shoulder hit with perfect timing. ];W[pi];B[oj]
C[If I could ask Master, maybe it would give me something like a 60% winning possibility for Black. White has to find a strong attack (see var). ]
(;W[rk]
C[White 70 is the standard shape, but was not good enough in this position. ]
;B[oi];W[pg];B[og];W[of];B[oh];W[nf];B[ph];W[qh];B[qg];W[rg];B[pf];W[qf]
;B[pg]
C[Again Chitetsu plays very simply and seemingly slow moves, but they are powerful.  White has a lot of cutting points to fix. ]
;W[bb];B[hb];W[kb];B[dd];W[bd]TR[cd]
C[White 88 would normally be at the marked point. By giving Black an extra liberty, Dosaku is luring Chitetsu into a final fight. ]
;B[ha];W[qe];B[oe];W[re];B[mf]
C[Capturing the two White stones, Black has thick shape. ];W[kn];B[jn];W[mg]
;B[ng];W[lf];B[ne];W[ei];B[he]
C[With the bad aji on the left, this looks like big trouble for White. Black probably didn't need to try this hard, but he was doing fine up to a certain point. ]
;W[hd];B[de];W[df];B[ee];W[ge];B[cd];W[bc];B[cf];W[be];B[ff]
C[Once more Chitetsu makes a double threat, and this should have been the decisive move (see var). ]
(;W[gg];B[dg];W[cg];B[ef];W[dh]
C[This is where Chitetsu misread (see var). ]
(;B[ch];W[bg];B[bf];W[af];B[df]
(;W[ae]
C[Maybe it was this move that Black missed...]
(;B[bh];W[ag];B[fh];W[cj]
C[...or maybe it was this one (see var). ]
(;B[qk]
C[Black has no good move on the left side. ];W[di]
C[Black's clump of stones in the center is weak. and now White has a winning position. ]
;B[rj];W[ri];B[si];W[sh];B[sj];W[sf];B[gh];W[gf];B[eh];W[fj];B[gj];W[gk]
;B[hj];W[hk];B[ik];W[il];B[jl];W[ij];B[jk];W[hh];B[gi];W[fg];B[ii];W[eg]
;B[nn];W[mn];B[mo];W[np];B[fk];W[dl];B[ck];W[fl];B[dj];W[ek];B[bj];W[ko]
;B[kp];W[km];B[jp];W[pm]TR[ch][mp])
(;B[bj];W[di]
(;B[dj];W[fg];B[eg];W[eh]
C[White wins])
(;B[fg];W[bi];B[ai];W[ah])))
(;B[ba];W[fg];B[bh];W[ag];B[ah];W[eg];B[ab];W[gf]
C[White wins]))
(;W[fg];B[bh];W[ag];B[ae];W[ad];B[ah];W[ae];B[ba]
C[Black wins]))
(;B[bf];W[bg];B[af];W[eg];B[df];W[ch];B[ba];W[fg];B[ab];W[gf];B[ac]
C[Black wins the semeai, and the game. ]))
(;W[cg];B[hf];W[ic];B[jd];W[kd];B[gf];W[jc];B[id];W[jd];B[jg]
C[If White protects the left side with 1, Black can squeeze in the center for an easy win. ]
))
(;W[qj];B[pl];W[mi]LB[kn:A][go:B]
C[I would suggest something like this for White. This is not going to be easy, but maybe White can use the peep at A and the potential of escaping with the stone at B to launch an attack. ]
))
(;W[gp];B[kr];W[jr];B[nq]TR[oq]
C[If White connects at 1, (the natural move) Black can use the forcing move at 2 to save the marked stone with 4. White's lower side is still weak, and White will not have an opportunity to invade the left side.  ]
))
(;W[jo]LB[ck:C][bq:A][cq:B]
C[The shape on the left side was fairly common at the time of this game, and there are countless examples of White using moves such as A, B, or C to reduce Black's potential territory. However, that will be possible only when White has a strong group on the lower side. White should play at 1 to attack the lower side Black group, and then invade the left side later. ]
))
(;B[jd];W[id];B[jc];W[ic]TR[lb]LB[ib:A]
C[Note how the marked stone makes it bad for Black to play at A. ]))
(;B[fc];W[nc];B[md];W[nd];B[me];W[mb];B[ne];W[pb];B[qb];W[ob];B[oe];W[no]
C[With this sequence White can settle the upper side group with sente. ]
))
(;W[jd]
C[heavy.]))
(;B[kd];W[mc];B[kc];W[od];B[qe];W[pf];B[qf];W[pg]LB[od:B][pd:A]
C[This is actually an even trade, as Black has gained by strengthening the upper side up to 3, but the A-B exchange is bad for Black. ]
;B[pp];W[qp];B[on]))
(;W[od];B[oe];W[qe];B[re];W[rd];B[rc];W[pb];B[sd];W[md];B[of]
C[White should not cover at 1 yet, as Black strongly cuts at 2 and White cannot save both sides. This is bad for White. ]
))
(;B[qe];W[pb];B[qb];W[pd];B[qc];W[pf];B[qf];W[pg]LB[jc:A][no:B]
C[The invasion at A remains a threat to Black, and is miai with White B. ]
))
(;W[od];B[qf];W[le];B[kd]
C[White is heavy, and Black is safe on both sides. ])
(;W[ld]
C[Dosaku often used a tsuke to make sabaki, but not yet in this case. ];B[kd]
;W[mc];B[kc];W[pe];B[qe];W[pf];B[qf];W[pg];B[pp];W[qp];B[on]TR[kc:kd][mc][ld]
C[1~4 (marked) has become a bad exchange for White, as the upper side Black group has been strengthened. ]
))
(;B[ec];W[ed];B[fc];W[dd];B[hd]
C[This would be a more efficient way for Black to surround the upper side. ]
))
(;B[cp]
(;W[dn];B[fo];W[em];B[dj];W[gm];B[hp]
C[Black can make a double attack. It is bad for White to move out like this. ]
)
(;W[cj];B[el];W[dh];B[go]
C[Black can expand the left side efficiently by playing towards the center with 2 and 
4, and attack the lower side White group. ]
)))
(;B[pq];W[nq];B[op];W[np];B[pn];W[qm]TR[jq]
C[The marked extension is well placed, so this is not bad for White. ]))
(;W[pq];B[kq]
C[In a game with komi, White might be happy to play like this, but allowing the extension at 2 simplifies the game and gives Black a good position when one considers the fact that there is no komi. ]
))
(;B[dc];W[ed];B[ec];W[fd];B[gc];W[qh];B[pe];W[gd];B[hc];W[fc];B[fb];W[gb]
;B[hb];W[eb];B[ga];W[cc];B[db];W[qb];B[nd];W[pq]
C[This looks like about an even result. White's play is an example of what I think Dosaku might have been planning if Black played the low kakari at 1. ]
))
(;B[cm];W[ec];B[cd];W[de];B[ce];W[df];B[cg];W[dm];B[dl];W[dg];B[ch];W[cf]
;B[bf];W[bg];B[bh];W[be];B[ag];W[cc];B[bd];W[gq];B[ep];W[dn];B[fo];W[cl]
;B[ck];W[bl];B[bk];W[el];B[dk];W[jq]LB[jp:A]
C[The sequence on the left side actually happened in some of Dosaku's games, but it is bad for Black. Black 26 is the most questionable move of this sequence, as it is a chance for Black to pincer at A. Black has overconcentrated shape on the left side. ]
))

