Following Iyama Yuta (no world ranking discussions)

Uberdude · **#341**

Kisei game 3, can you find Iyama's 42% mistake and Yamashita's 44% return of the favour; Iyama (white) won in the end. LZ's suggested move is the one I expected watching the game and its analysis appears sound to me. Is it missing something, or did the players really make such a big mistake?

Uberdude · **#342**

Iyama has got off to a bad start in the Meijin league, so what may have been assumed as a foregone conclusion that he would top the league to challenge Cho U to regain his title may not be so certain. He started off with a win against Mutsuura Yuta 7d, but then lost to Suzuki Shinji 7d (who? you may ask) by half a point. And just today he lost to prodigal youngster Shibano Toramaru 7d by 1.5 so he's 1-2 so far, with 5 games left.

mhlepore · **#343**

You can't leave us hanging... What was the 42% mistake?

Uberdude · **#344**

mhlepore wrote:

You can't leave us hanging... What was the 42% mistake?

Here is the position after move 189. White's stick on row 8 has just finished hassling the black group above and the fight resumed at the bottom left corner. White can push and cut with a-c to capture the cutting stones (each has 3 liberties but black needs to defend the g5 stones so white goes first), but would also like to kill the corner too if possible. LZ 203 says white is at 84%.

Iyama (white) vs Yamashita, White 84%

Click Here To Show Diagram Code: [go]$$Bc Iyama (white) vs Yamashita, White 84% $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . . . . . . . X O . X O O . . . | $$ | . X O X X b c . . . X O . X O X . . . | $$ | . . X O X a X . . . X X . X O . . . . | $$ | . . X O O O X . . , . . . . O , . . . | $$ | . . X O . X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

First, what if white simply goes for the cut and capture. If white 7 takes a liberty black can connect under in sente and gets to play an important move like r4 next. White ends at 22%.

Direct cut. 22%

Click Here To Show Diagram Code: [go]$$Wc Direct cut. 22% $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O 7 9 . 5 . . . X O . X O O . . . | $$ | . X O X X 2 3 4 . . X O . X O X . . . | $$ | . . X O X 1 X . . . X X . X O . . . . | $$ | . . X O O O X . 6 , . . . . O , . . . | $$ | . . X O . X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . . 0 8 . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Instead of 7 white can put in the sente hane in the corner to prevent black's connection, but then black can make a comb group to live in the corner. White 40%.

No connection, but a comb life. 40%

Click Here To Show Diagram Code: [go]$$Wcm7 No connection, but a comb life. 40% $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O 3 5 . O . . . X O . X O O . . . | $$ | 6 X O X X X O X . . X O . X O X . . . | $$ | . . X O X O X . . . X X . X O . . . . | $$ | . . X O O O X . X , . . . . O , . . . | $$ | . . X O 4 X O O . . . . . . . X . . . | $$ | 2 X O O X . X . . . . . . . . . . . . | $$ | . 1 . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Starting with the hane in the corner seems pretty natural to me (and is the correct move says LZ), those white stones are weaker than the wall above so it makes sense to play from that direction, and that hane can often gain you a liberty in a semeai. If black extends with 2 (not best) to make the possibility of a comb group life, white captures a stone with b5 (not best), black ataris with b4 (not best) then white has, in sente, reduced the corner to one eye and got the b1 hane. White up to 96% with black's cooperation.

Sente moves on corner before cut. 96%.

Click Here To Show Diagram Code: [go]$$Wc Sente moves on corner before cut. 96%. $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . . . . . . . X O . X O O . . . | $$ | 5 X O X X . . . . . X O . X O X . . . | $$ | . 3 X O X . X . . . X X . X O . . . . | $$ | 6 4 X O O O X . . , . . . . O , . . . | $$ | . . X O . X O O . . . . . . . X . . . | $$ | 2 X O O X . X . . . . . . . . . . . . | $$ | . 1 . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

Note that 4 above is a mistake, it's better at 6, then white pushes and captures a stone and black gets to defend at f5 and the corner will be a ko. So 3 was also a mistake, it should be at the vital point of 6 too and white is then successful in turning the black corner into 1 eye in sente as before and f5 push and cut. So 2 was also a mistake, see later.

So next white pushes and cuts, and that handy b1 hane means black can no longer connect under in sente, only gote. A big difference.

Gote connection under. 96%.

Click Here To Show Diagram Code: [go]$$Wcm7 Gote connection under. 96%. $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . 9 7 5 . . . X O . X O O . . . | $$ | O . O X X 2 3 4 . . X O . X O X . . . | $$ | . O X O X 1 X . . . X X . X O . . . . | $$ | X X X O O O X . 6 , . . . . O , . . . | $$ | . . X O . X O O . . . . . . . X . . . | $$ | X X O O X . X . . . . . . . . . . . . | $$ | 0 O . 8 . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

So if white hanes in the corner it's better for black to make the hanging connection. Now if white wants to reduce it to 1 eye (best) its gote instead of sente like it was with the descent. If black f5 white can tenuki as the corner is still a ko, so black probably plays in lower right.

Hanging. 85%

Click Here To Show Diagram Code: [go]$$Wc Hanging. 85% $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . . . . . . . X O . X O O . . . | $$ | 5 . O X X . . . . . X O . X O X . . . | $$ | . 3 X O X . X . . . X X . X O . . . . | $$ | . 4 X O O O X . . , . . . . O , . . . | $$ | 2 . X O . X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . 1 . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

If instead of 3 above white pushes and cuts then black can sort-of live in the corner next (thought lower right may be bigger).

Hanging then cut. 76%

Click Here To Show Diagram Code: [go]$$Wc Hanging then cut. 76% $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . . 9 7 . . . X O . X O O . . . | $$ | . X O X X 4 5 6 . . X O . X O X . . . | $$ | . . X O X 3 X . . . X X . X O . . . . | $$ | . . X O O O X . 8 , . . . . O , . . . | $$ | 2 . X O 0 X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . 1 . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

13 doesn't work because black can connect under with 16, and although there is a ko at a2 black winning it is atari so nigh on impossible for white to fight.

Hanging then cut contd. 76%

Click Here To Show Diagram Code: [go]$$Wcm11 Hanging then cut contd. 76% $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | 6 O O . 1 O O . . . X O . X O O . . . | $$ | 2 X O X X X O X . . X O . X O X . . . | $$ | . 4 X O X O X . . . X X . X O . . . . | $$ | 5 3 X O O O X . X , . . . . O , . . . | $$ | X . X O X X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . O . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

So that's what white should do. But Iyama didn't hane in the corner but just captured the outside stone directly. LZ says this lost 42%, white down from 85 to 43%.

Capture a stone. 43%

Click Here To Show Diagram Code: [go]$$Wc Capture a stone. 43% $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . . . . . . . X O . X O O . . . | $$ | 3 . O X X . . . . . X O . X O X . . . | $$ | . 1 X O X . X . . . X X . X O . . . . | $$ | . 2 X O O O X . . , . . . . O , . . . | $$ | . . X O . X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . . . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

But this is only if black descends at the vital point in the corner. White can then push and cut as before, but black connects underneath in sente and can move to the lower right. Admittedly black doesn't actually connect to an alive group as he can't get e3 too and LZ might throw away the whole group later in a trade for p4 group later... LZ gives black 52% now.

Descend, connect under, 48%.

Click Here To Show Diagram Code: [go]$$Bcm4 Descend, connect under, 48%. $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . b 0 6 . . . X O . X O O . . . | $$ | O . O X X 3 4 5 . . X O . X O X . . . | $$ | . O X O X 2 X . . . X X . X O . . . . | $$ | 8 X X O O O X . 7 , . . . . O , . . . | $$ | . 9 X O . X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . 1 . a . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

But instead Yamashite played the a4 decent to prevent that atari, -47% says LZ, but then Iyama got to hane in the corner and it ends up sort of like if white played the hane first. If black plays a2 white can just push and cut and black only has the pathetic gote connection like before, so black defended f5 and the corner will be a ko, but white gets sente and is at 91%.

Yamashita's counter-mistake. White 91%.

Click Here To Show Diagram Code: [go]$$Bcm4 Yamashita's counter-mistake. White 91%. $$ --------------------------------------- $$ | . . . . . . O . O X X . . . . . . . . | $$ | . O X X . X O O O O X X X X X . O . . | $$ | . . O X . X X O O X X O O O . X O . . | $$ | . . O O X . . . O O X . X O X X O . . | $$ | . . . . . X X X X O X X X X O X O . . | $$ | . . O . . O . O X O O O X X O X X O . | $$ | . O . . . O . O O X . O O O O X X O . | $$ | . X O O . . . . . X . O . O O X O . . | $$ | X . X . X . . X O . X X O O X O O . . | $$ | . . . X . . X . . , X O X O X X . . . | $$ | . X X O X X O X X X . O X X . X . . . | $$ | . . O O O O O O O O O O . X X . . . . | $$ | . O O . . . . . . . X O . X O O . . . | $$ | O . O X X . . . . . X O . X O X . . . | $$ | . O X O X 3 X . . . X X . X O . . . . | $$ | 1 X X O O O X . . , . . . . O , . . . | $$ | . . X O . X O O . . . . . . . X . . . | $$ | . X O O X . X . . . . . . . . . . . . | $$ | . 2 . . . X . . . . . . . . . . . . . | $$ ---------------------------------------[/go]

So is there something wrong in this analysis, a move LZ overlooked or dubious judgement? I don't think Iyama could have been scared of the ko in LZ's correct answer, seeing as he went for a ko in the game anyway.

mhlepore · **#345**

Ah very cool - thanks Uberdude. There was a messy fight right from the start so I really had no idea of the goof was earlier or not.

Uberdude · **#346**

LZ thought there were some mistakes in the early fights around 10%, but it's quite rare to have almost 50% ones in pro games.

Uberdude · **#347**

Iyama beat Yamashita in the 4th Kisei game to take a 3-1 lead.

Uberdude · **#348**

Yamashita faced kadoban in the 5th game, and after the first days' play (just 49 moves) bots had Iyama with a nice lead of >70% depending which one you asked. But Iyama made a critical mistake in the middlegame (solid extend instead of knight move) which meant Yamashita got a nice squeeze to turn the game around and a big ko trade later couldn't change the result. so Iyama leads 3-2 now.

sorin · **#349**

Uberdude wrote:

Yamashita faced kadoban in the 5th game, and after the first days' play (just 49 moves) bots had Iyama with a nice lead of >70% depending which one you asked. But Iyama made a critical mistake in the middlegame (solid extend instead of knight move) which meant Yamashita got a nice squeeze to turn the game around and a big ko trade later couldn't change the result. so Iyama leads 3-2 now.

Don't you mean it is 4-1 now and the title match is over? :-)

DoubleSente · **#350**

I read Uberdude as saying that Yamashita took a lead and Iyama was unable to take the game back. In that case, Iyama lost game 5, and the series is now 3-2.

sorin · **#351**

DoubleSente wrote:

I read Uberdude as saying that Yamashita took a lead and Iyama was unable to take the game back. In that case, Iyama lost game 5, and the series is now 3-2.

Oh, so sorry - I followed this game with swapped colors in my mind!!
I was feeling very sorry for Yamashita blowing the game after such a strong opening, now I need to revise my feelings :-)

sorin · **#352**

sorin wrote:

DoubleSente wrote:

I read Uberdude as saying that Yamashita took a lead and Iyama was unable to take the game back. In that case, Iyama lost game 5, and the series is now 3-2.

Oh, so sorry - I followed this game with swapped colors in my mind!!
I was feeling very sorry for Yamashita blowing the game after such a strong opening, now I need to revise my feelings :-)

My revised feelings: Yamashita masterfully turned the game around and got a well deserved win!

I am not necessarily a big fan of Yamashita, but I think Iyama won enough titles already, and it is time for him to pass the baton back to the older generation. :-)

Uberdude · **#353**

sorin wrote:

Oh, so sorry - I followed this game with swapped colors in my mind!!

Couldn't you tell black was Yamashita from the unconventional high move 7? ;-)

sorin · **#354**

Uberdude wrote:

sorin wrote:

Oh, so sorry - I followed this game with swapped colors in my mind!!

Couldn't you tell black was Yamashita from the unconventional high move 7? ;-)

Both black 7 and 9 seemed unconventionally high indeed, I thought Iyama is so relaxed he can afford to play around and experiment a bit :-)

Uberdude · **#355**

Iyama beat Murakawa Daisuke in the first game of the Judan title match today in a pretty convincing fashion. Next up: another chance to win the Kisei vs Yamashita with 6th game on 7th/8th.

sorin · **#356**

Is this going to be Yamashita's losing move, so early at the beginning of day 1?
He played atari and lost 10% right there, and it seems to go downhill from there for him. Maybe too early to say?

lichigo · **#357**

Quick analyse by lizzie with leelazero 201, black(iyama) is leading, around 63%.

Uberdude · **#358**

sorin, rather than taking the 40.4 winrate from only 1.8k playouts I'd suggest playing that atari and giving plenty of playouts for a more accurate assessment (particularly as a ko so LZ needs playouts to get through the ko and judge outcome of trades). Elf v2 thought it was a 30% mistake, and the bot they use on Yike 鹰眼 "Hawkeye" gave a similar 45 -> 18% white winrate judgement. Having said that Yamashita won the previous game from a position the bots judged as similarly bad, though there is the question whether this position has a similar scope for a human like Iyama to mess up.

Going back a few moves, all those bots slightly disliked Yamashita's attachment on the shimari, Elf suggesting this very nice nozomi (a shape I've noticed many bots like and I've been trying to promote up my policy network recently, see https://lifein19x19.com/forum/viewtopic ... 23#p227323), attach a crosscut combo. This is too good for white who bullies black into overconcentration whilst making good outside shape, so 4 should wedge but white is still good.

Click Here To Show Diagram Code: [go]$$W $$ +---------------------------------------+ $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . O . . . . . . . . . . . . . . . | $$ | . . . , O . . . . , . . . . . X . . . | $$ | . . X . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . , . . . . . , . . . . . , . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . O . . . . . . . . . . . . . X . . | $$ | . . . . . . . . . . . . . . 1 . . . . | $$ | . . . O . X . . . O . 3 4 . . 2 . . . | $$ | . . . . O X . . . . . X 5 . . X . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ | . . . . . . . . . . . . . . . . . . . | $$ +---------------------------------------+[/go]

Uberdude · **#359**

Gosh, I just checked the game and Yamashita pulled off another reversal from a dismal position (the Yike bot had Yamashita down at 5%). Iyama had 2 weak groups which he should have been able to settle by exploiting the bad aji in Yamashita's attacks and keeping miai for safety, but one little inaccuracy (move 199*) and the group died in ko. Usually it's Yamashita making mistakes vs Iyama in overtime. 3-3 now, decider is on 14-15 March. This would be quite the comeback for Yamashita if he can pull it off, not just from game scores but the losing positions he is winning from when facing kadoban.

(;GM[1]FF[4]CA[UTF-8]SZ[19]RU[jp]KM[6.5]HA[0]PB[井山裕太]PW[山下敬吾]SO[困就睡觉的大門君]AP[第43期日本棋圣战七番棋第六局]C[大門：大家好，欢迎收看日本棋圣战七番棋第六局。目前比分是井山棋圣3比2领先。棋圣战是两日制，每方8小时，有10次1分钟读秒。比赛是3月7日早8点开始。比赛地点在日本神奈川县箱根町花月园酒店。↵];B[pd]C[大門：第六局井山棋圣执黑先行。↵];W[dp];B[pq]C[大門：星小目布局，看来是准备了套路。↵];W[dc]C[大門：白棋也是星小目......↵,鹰眼：白棋 53.08%↵];B[ce];W[ed]C[大門：小尖，历史悠久的下法。有几百年历史了。鹰眼这图井山应该不会选择，不符合他的风格。↵,鹰眼：白棋 52.48%↵];B[fq]C[鹰眼：黑棋 43.01%↵,大門：挂角是真掉胜率啊......但是这点胜率对人类来说显然无所谓。↵];W[cn]C[大門：山下老师也没有选择鹰眼推荐的尖顶。确实对日本棋手来说，这个尖顶真的很难下出手。↵];B[qn]C[鹰眼：黑棋 42.1%↵,大門：鹰眼推荐的这个夹击也太紧了吧......↵];W[eq];B[fp]C[大門：夹击必然，就看夹低位还是高位。↵];W[jp]C[鹰眼：白棋 51.35%↵,大門：鹰眼推荐的四路反夹很有力啊！我第一感是反夹在三路。↵];B[lq]C[大門：果然......我比鹰眼更了解日本棋手。因为风格都差不多......↵,鹰眼：黑棋 46.45%↵];W[pn]C[大門：这时候去撞右下完全没想到......我还真不是井山的铁粉。现代的日本棋手我最喜欢张栩九段，以前的最喜欢藤泽秀行九段。↵,鹰眼：白棋 45.31%↵];B[pm];W[qo];B[po];W[on];B[qp];W[qm];B[ro];W[rn]C[大門：这还要欺负一下......呀！这胜率没少掉啊。↵,鹰眼：白棋 18.34%↵];B[ql];W[qo];B[do]C[大門：井山的判断非常正确，看来状态不错。↵];W[co];B[qn];W[rm]C[鹰眼：白棋 19.37%↵,大門：虽然胜率是掉了，但是比赛中的棋手应该不会察觉，不然他也不会选择这个变化。↵];B[om]C[鹰眼：黑棋 82.87%↵,大門：哟，评论区的老司机今天没堵车啊......↵];W[nn]C[鹰眼：白棋 12.7%↵,大門：我是想直接消劫......↵];B[qo];W[pl]C[鹰眼：白棋 18.89%↵];B[ol];W[pk];B[rl]C[大門：......打脸了！↵,鹰眼：黑棋 77.95%↵];W[nk];B[ok];W[oj];B[pj];W[qk];B[nj];W[oi];B[rk];W[qj];B[nl];W[mk];B[ml];W[ll]C[大門：乱战局面胜率只能作为参考，从接龙到反接龙也就是一手棋的事。↵,鹰眼：白棋 22.04%↵];B[lk];W[mj];B[lm];W[kl];B[mm]C[大門：进程非常快，在第一天上午就已经下了50多手......↵,鹰眼：黑棋 77.86%↵];W[km]C[鹰眼：白棋 14.16%↵,大門：这拐......又把局面搞恶化了。↵];B[pi]C[大門：好时机！就井山今天的状态，应该是没有第七局了。午休了，12点继续。↵,鹰眼：黑棋 86.46%↵];W[rj];B[mi];W[lj]C[鹰眼：白棋 3.93%↵];B[oh];W[ni];B[nh];W[nj];B[sn]C[鹰眼：黑棋 96.3%↵];W[ph];B[qi]C[大門：这战役白棋胜率已经炸了......↵];W[ri];B[qh];W[pg]C[鹰眼：白棋 3.58%↵];B[rh]C[大門：白没心情下也得下啊。毕竟没有退路，怎么也得坚持到明天吧......54拐是秒拍的，拍完山下老师才觉得不对劲，觉得不对劲也晚了。↵];W[li]C[大門：......鹰眼的意思，黑棋挑最普通最简明的下就大优。（我这说的不是废话么......）↵,鹰眼：白棋 3.41%↵];B[mh]C[鹰眼：黑棋 85.85%↵];W[lh]C[鹰眼：白棋 14.52%↵];B[of]C[鹰眼：黑棋 81.42%↵,大門：井山这浓浓的优势意识啊...... 现在白棋需要用外势搞事，争取开辟新的战场。↵];W[ln]C[大門：感觉今天手数可能会超过80手。↵];B[mf];W[iq]C[鹰眼：白棋 17.28%↵,大門：左下三子是可以弃掉的......↵];B[ko]C[大門：井山接触战还是这么犀利。插播一条新闻，在刚刚结束的日本名人战预选赛，老将林海峰九段执黑99手速胜萩原睦七段......林老师竟然还在赢棋......真的是佩服。↵,鹰眼：黑棋 79.73%↵];W[lp]C[鹰眼：白棋 20.45%↵,大門：鹰眼就盯准右上了...... 但是井山应该没兴趣走那里。↵];B[hq]C[鹰眼：黑棋 74.21%↵];W[hp]C[大門：在左下暴动黑棋没有占便宜的道理，局部白棋明显强势。（白棋跟着应反倒掉胜率了......）↵,鹰眼：白棋 17.28%↵];B[cq]C[大門：相当敏锐啊，这样看白棋80有上当的嫌疑。山下九段准备封手，明早8点继续。↵];W[dq]C[大門：封手是强硬的团在这里。↵,鹰眼：白棋 23.36%↵];B[io]C[鹰眼：黑棋 63.73%↵,大門：这手棋没看懂。但是鹰眼的胜率突然出现了波动。↵];W[kp]C[大門：接这里？↵,鹰眼：白棋 23.8%↵];B[ip]C[鹰眼：黑棋 66.46%↵];W[hr];B[gq];W[jr]C[鹰眼：白棋 33.23%↵];B[dn]C[大門：鹰眼一直强调右上的价值。↵,鹰眼：黑棋 66.4%↵];W[dm];B[fn]C[鹰眼：黑棋 70.9%↵];W[cp]C[大門：黑棋补棋，白棋大概掏右上了。↵];B[ch]C[大門：这个拆二巨大。右上是彻底被俩人忽略了。↵,鹰眼：黑棋 62.46%↵];W[ne]C[鹰眼：白棋 20.36%↵,大門：长考后在这试应手......这选点谁能想到......↵,赵晓欧：这胜率井山近期又不是没勺回去过，都能下。↵];B[pf]C[鹰眼：黑棋 80.17%↵];W[pc]C[大門：思路很连贯。↵,鹰眼：白棋 21.25%↵];B[oc];W[od]C[大門：午休了，12点继续。↵,鹰眼：白棋 25.8%↵];B[ob]C[鹰眼：黑棋 77.52%↵];W[pb]C[鹰眼：白棋 12.51%↵,大門：鹰眼是认为局部价值不大了。↵];B[nd];W[oe];B[pe]C[鹰眼：黑棋 87.15%↵];W[me]C[大門：局部白棋被纠缠住了，棋盘会越来越小。黑棋左上的拆二闪闪发光，左下也完全不像会出事的样子。↵,鹰眼：白棋 7.79%↵];B[lc]C[大門：可以提前恭喜井山达成棋圣战七连霸了。↵,鹰眼：黑棋 91.56%↵];W[ld]C[大門：第一感长出去。↵,鹰眼：白棋 5.96%↵];B[kc]C[大門：现在是黑棋实地明显多，而且左下也不像是弱棋。↵];W[qd]C[鹰眼：白棋 6.41%↵,大門：放白棋净活，黑都大优。↵];B[qc];W[qb];B[rc]C[鹰眼：黑棋 90.46%↵];W[oa]C[鹰眼：白棋 4.57%↵,大門：这好像是找投场......角里打不打劫跟胜负无关。井山其实早算清楚了，他是在折磨山下。↵];B[mb];W[qa];B[nb];W[rd]C[鹰眼：白棋 5.54%↵,大門：其实我下刚才就直接放活了，连断都不用断。↵];B[rb];W[ra];B[re];W[sb]C[鹰眼：白棋 4.31%↵,大門：109时，我是想走S15的。但是实战结果都一样，这里后手活对全局影响不大。↵];B[kf]C[大門：虽然胜率有波动，但是这手棋本身是好棋。只要左下不被怼死啥事没有。↵,鹰眼：黑棋 86.21%↵];W[ke]C[大門：两日制比赛我不可能全程动脑子。所以你们爱怎么说怎么说。动脑子很容易疲劳，坐不住。我播的经验多了，我知道怎么节省体力。怎么分配体力。↵];B[lf];W[jf]C[鹰眼：白棋 4.16%↵,大門：鹰眼依旧在强调加强左下。↵];B[je]C[大門：断是人类的下法，绝大多数棋手第一感都会在这里。↵,鹰眼：黑棋 89.26%↵];W[hn];B[ho]C[鹰眼：黑棋 88.03%↵,大門：井山其实早算清了，所以他不补棋。十段战第一局就依靠治孤把村川大介折磨的欲仙欲死。↵];W[gn];B[go]C[鹰眼：黑棋 89.92%↵,大門：评论区老司机开车了？话说最近谢兴福大哥怎么不来冒泡了。↵];W[dh]C[鹰眼：白棋 2.31%↵];B[ci];W[fl]C[鹰眼：白棋 6.05%↵];B[gm];W[hm];B[em]C[鹰眼：黑棋 67.81%↵,大門：133.135够猥琐的......↵];W[eo];B[en];W[ep]C[大門：应该就是按照鹰眼这图发展。↵];B[fo]C[大門：挡只此一手吧，这不挡不是被干出去了么......↵,鹰眼：黑棋 80.56%↵];W[el]C[鹰眼：白棋 13.42%↵];B[dl];W[cm];B[gl]C[鹰眼：黑棋 83.81%↵];W[fj]C[鹰眼：白棋 11.57%↵,大門：这井山也真是的，之前就是不补棋，非得玩这么刺激。↵];B[fm]C[大門：这棋我又要搬出老台词了，就是我拿黑棋活不了，拿白杀不掉。↵,鹰眼：黑棋 89.25%↵];W[dg]C[大門：能长到吗？这时候长需要勇气的，井山如果不应也是需要勇气的。↵,鹰眼：白棋 5.8%↵];B[cg]C[大門：好吧......↵,鹰眼：黑棋 86.52%↵];W[hl];B[gk];W[ej]C[大門：嗯？黑棋拐完跳出去了。↵,鹰眼：白棋 5.34%↵];B[hk];W[il]C[大門：16点时黑棋还剩56分钟，白还剩48分钟。（消息来源于找借口安静）↵];B[hi]C[鹰眼：黑棋 93.21%↵,大門：我刚才一直在想，如果之前是一力辽拿黑棋，会不会玩死。↵];W[jd];B[ie]C[鹰眼：黑棋 93.58%↵];W[if]C[鹰眼：白棋 6.61%↵];B[he];W[hf]C[鹰眼：白棋 5.77%↵];B[ih]C[大門：山下还有不到20分钟，井山还有40分钟。↵,鹰眼：黑棋 90.64%↵];W[ij];B[ik];W[jk]C[鹰眼：白棋 8.69%↵,大門：这图......这么刺激嘛。确实，这局面胜率没有意义。死活定胜负。↵];B[jg]C[鹰眼：黑棋 83.26%↵];W[ge];B[kd]C[鹰眼：黑棋 63.68%↵,大門：这个断，把胜率干下去了。难道去年名人战的剧情要重演？↵];W[bd]C[鹰眼：白棋 8.45%↵,大門：......好吧。↵];B[fh]C[鹰眼：黑棋 90.08%↵];W[ck]C[鹰眼：白棋 6.16%↵];B[cd];W[bc];B[cc];W[cb]C[鹰眼：白棋 5.01%↵];B[db]C[鹰眼：黑棋 94.62%↵];W[bb];B[df]C[鹰眼：黑棋 94.42%↵,大門：日本围棋真是耗费体力...... 我看了两天都觉得累。何况比赛棋手了......↵];W[eg]C[鹰眼：白棋 6.07%↵];B[bk];W[bf];B[be]C[鹰眼：黑棋 89.35%↵];W[ef]C[鹰眼：白棋 8.4%↵];B[kh]C[鹰眼：黑棋 86.76%↵,大門：从心情上来说，井山虎这个已经是认赢的态度了。↵];W[ii]C[鹰眼：白棋 6.07%↵];B[kj];W[ki]C[大門：183可能是打将。↵,鹰眼：白棋 12.6%↵];B[ji];W[kk]C[鹰眼：白棋 17%↵];B[hg]C[鹰眼：黑棋 74.92%↵];W[hd];B[le]C[鹰眼：黑棋 78.04%↵];W[mn];B[sm];W[cf]C[鹰眼：白棋 27.81%↵,大門：鹰眼判断杀一半不够。↵];B[af]C[鹰眼：黑棋 69.68%↵];W[de];B[bg]C[鹰眼：黑棋 71.26%↵];W[qm]C[大門：读秒打将。↵];B[rm];W[gh]C[鹰眼：白棋 28.07%↵];B[gi]C[鹰眼：黑棋 46.62%↵,大門：......这胜率↵];W[gg];B[hh]C[大門：剧本怎么跟以前不一样了......↵,鹰眼：黑棋 42.63%↵];W[bj]C[大門：俩人读秒技能包拿反了吧......↵,鹰眼：白棋 75.17%↵];B[cj];W[bl]C[鹰眼：白棋 77.42%↵];B[bi];W[ah]C[大門：我服了......我有毒吧。去年名人战就输了好几亿豆宝，今年棋圣战也是......↵,鹰眼：白棋 82.26%↵];B[aj];W[al];B[df];W[cf]C[大門：局部是不活的。↵,鹰眼：白棋 77.64%↵];B[eb];W[fb]C[大門：山下读秒......太强了。↵];B[fc]C[鹰眼：黑棋 23.24%↵];W[gb];B[ec]C[鹰眼：黑棋 23.12%↵];W[dd]C[大門：以前井山在日本是怎么落后都不输，现在是领先了拿不下。↵];B[gc]C[大門：局部是个劫。↵];W[hc]C[鹰眼：白棋 76.95%↵];B[ca];W[ba]C[大門：现在山下老师属于光脚不怕穿鞋的。↵];B[ea]C[大門：这盘棋剧情和上一盘极像......↵];W[gd]C[大門：井山一定很后悔当初左下不补棋。↵];B[hb];W[ib];B[ad]C[大門：日本那边伊田笃史八段已经判井山死刑了。↵];W[fd];B[ac];W[da]C[鹰眼：白棋 77.16%↵];B[dk];W[cl];B[ca];W[nm]C[大門：平成四天王组团回来的。↵];B[qm];W[da];B[dj]C[鹰眼：黑棋 20%↵];W[ei];B[ca];W[qg];B[sj];W[da]C[鹰眼：白棋 84.3%↵];B[fk];W[ek];B[ca];W[rg];B[si];W[da]C[鹰眼：白棋 86.55%↵];B[lg]C[大門：这个......消劫赢了吧。↵,鹰眼：黑棋 11.88%↵];W[jj];B[ca];W[jh]C[鹰眼：白棋 87.37%↵,大門：白中盘胜。挑战者山下敬吾九段连扳两局把比赛拖入决胜局。决胜局是3月14-15日进行。感谢各位耐心收看，再见。↵])"

* Yike bot said that's where the turning point was, I had a little explore with LZ on low playouts and can see some variations in which blocking from above instead is better because black can force with f11 and h10 causing some shortage of liberties aji in the bamboo joint giving connection aji through e11, though the a12 placement is sometimes a surprise so more thorough analysis needed to conclude black would indeed have survived blocking that way.

Uberdude · **#360**

Here's my analysis with LZ 207 about why block other side for 199 was better. Conclusion, it is: having the stone at g13 comes in very useful 40 moves later when black wants to counterattack against white's middle group in a semeai he can then win by 1 liberty, or creating the shortage of liberties in the e10 bamboo combo-ing with e11. There are some lines where white does kill the left group but that involves ignoring a move in the middle so black captures a bunch of stones there in sente and wins anyway. The intuition of these bots to see block above better in just hundreds of playouts (<1 second) when it depends on ~40 move sequences of delicate use of aji is impressive. I expect Iyama could do it too if he had enough time and concentration though.

Following Iyama Yuta (no world ranking discussions)

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