Fujitsu 2011 final game analysis

    Keywords: Opening

The game evolved from a variation of the 3-4 point low approach two-space high pincer 4-7 press, into a fighting game. Qiu Jun (White) deviated from the common patterns at move 16 (W10 in below diagram), creating what has been judged as a potential new joseki.

Until further notice, the following analysis was conducted at 2d amateur level. GoGameGuru's [ext] article has An YoungGil's splendid treatment of this game and the joseki.

Moves 7 to 16  

Earlier, W16 was played at a. See 3-4 point low approach two-space high pincer 4-7 press, variation 3.

Moves 17 to 26  

W22 can be a move hard to understand. If White captures a stone at B23 instead, Black will live by intruding into the left and White's influence may not be sufficient.

Moves 27 to 36  

B27 here is an important point for influence. If at W28 instead, White will exchange a for b then take this point and Black's top central stones are floating.

Moves 37 to 38  

When Black defends at B37 here, White continues to develop this corner exchange into a large scale fight with W38.

Joseki evaluation:

  • Corner territory: Divided. Both have a small group, Black's being a bit larger.
  • Influence: Black has influence towards the top side, cooperating well with his top right corner stone. White likewise has influence towards the bottom right. White has more influence towards the centre.
  • Aji: White's position is somewhat thinner, with a and b as potential cuts. Black's top group however is a bit heavy.
  • Sente: White has sente now, but considering the pattern evolved in one of "his" two corners, this is only to be expected.

Why not here with W22?  

Although Black is crawling along the second line, perhaps White did not get enough from a left side where he invested 2 stones.

AI evaluation

Moves 5 to 14  

As we know, KataGo is not too fond of the pincer W6 nor the counter pincer B7. The wedge of B9 is perhaps a little inferior to a simple stretch, then W10, B11 and W12 are all blue moves?. For B13 ...

Alternative for B13  

... KatatGo? suggests this variation. The original counter pincer stone black+circle is blighted but the original pincer stone white+circle is also badly affected by Black's influence. Black gets sente too to play the biggest corner reinforcement B7.

Alternative for W14  

For W14 KataGo likes this much better. Notice how the two pincer stones are again disregarded by both as almost junk. Here White gets to play the big corner move W7.


Black's cut B15 is favorable. W20 would be better at A for a reason I can't explain. B21 is not necessary, KataGo thinks and should try living on the left side already. W22 is an outright mistake (2,1 pts) and White should in fact capture at B:

What if White captures  
What if White captures (ctd)  

Variations can become pretty sharp now, with L&D situations on the left side but the point is that 1) White lives in the corner 2) White pressures the left side and is resilitent in the center 3) Black's connection at A is light and 4) White has the better chance to take the big sente at B first.

Fujitsu 2011 final game analysis last edited by bugcat on September 28, 2021 - 18:42
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