On the topic of "idle magic hands", two sets have been discussed before, and the results show that Yasui knows that he is self-adhesive and the fake magic hands are more meaningful, compared to the jump that Lee Sedol induced without hair is more exciting.
In addition, the more famous "idle magic hand" is Li Changhao's white 88 all the way to Ma Xiaochun, see the figure below, which was previously analyzed in detail by Teacher Hu Yaoyu.
(Lee Chang-ho wins ma Xiaochun in mid-game)
Similarly, there is another trick, I don't know if everyone has an impression?
This hand is also from the hand of Lee Chang-ho, which is also standing all the way, and the number of hands is almost the same, the black 87th hand.
(Lee Chang-ho in the 2006 Toyota Cup)
Coming to the second round of the 3rd Toyota Cup World Go Throne Battle in 2006, Lee Chang-ho held a black match against Gu Li.
In the middle of the game, Lee Chang-ho played the strange hand of black 87 all the way -
(Lee Chang-ho wins over Guli in black mid-game, 2006.8.28 Japan Chess Academy)
In the mid-market stage, there are still many undecided places, and at this time, the black 87 is unexpected.
As soon as this hand came out, it immediately triggered a heated discussion in the research room, and it is said that Lee Sedol is quite optimistic about this hand.
There is a lot of content that can be mined about the before and after of this chess hand, and this article only throws bricks and stones.
Let's first look at the background of the story -
(In Action)
Previously, black was quickly fixed in the upper left corner, and white competed for the lower right 7 tigers - a hand that seemed to be small and big, and had gains in terms of eye position, eye number, thickness and thinness.
However, generally speaking, the White 7 Tiger is a step backhand, and Lee Chang-ho did not fall into a slight thought about it, and the chess game entered the noon seal.
In the afternoon, Lee Chang-ho's next chess hand attracted attention -
In the afternoon, Lee Chang-ho played a strange trick of Black 1 all the way, which was also a hand that made the research room uproar, and it was likely to be unexpected by Gu Li.
What is the purpose of this move? Let's list them one by one
1 Mesh value: reverse harvest 4 mesh strong (white walking in black 1 has the meaning of the first hand)
2 There is some damage to the eye position under the potential dialogue
3 Indirectly strengthen the upper right corner, high efficiency chess
If only according to the two articles 1 and 2, it is not enough to justify this move,
Therefore, article 3 "efficiently strengthen the upper right corner" is the main purpose of this chess hand.
What does this chess hand have to do with the top right corner? For example, for example—
(Variation Figure 1)
If the black 1 is off the front, such as the follow-up of the white upper right out of the 2 positions, in this regard, if the black is all supported, it may form a change as shown in the figure, due to the tightness of the black chess, the broken tail has become inevitable.
In contrast, if Black A has a way to stand a son, Black can safely kill chess.
Of course, there are many possibilities here, but it is certain that Lee Chang-ho's actual combat has played a certain role in promoting the efficient success of the upper right black chess.
However, in actual combat, Gu Li pressed the pause button on the field process in the upper right of the black chess.
After Kuroichi stands, Gu li immediately casts a trick in the upper right corner (Black 5-tip borrowed to take care of the upper side of the break).
In this regard, Guli Bai 6 raided all the way, which tested the wonderful means of black chess.
First of all, to make it clear, when the white is 6 o'clock, the black cannot be taken off first, otherwise it will be broken by the white a position, and it will not be able to rob the black.
The black side revolves around the complement, and there are roughly four methods of a, b, c, and d, each with its own advantages and disadvantages, and not one by one.
In actual combat, Lee Chang-ho chose the a position to catch, then, this exchange black chess piece was also cheapened.
Why? Let's do a comparative experiment
(1) Control group:
(Variation Figure 2)
There is no exchange of points in real combat.
White 1 if blocked, black 2 can point into the kill chess, black 10 after the pull, local white net death.
(2) Experimental group:
(Variation Figure 3)
There is an exchange of white 1 and black 2.
There is a problem with the net killing method of change figure 2, when black 12 pulls all the way, white 13 can be used as an eye, and black can no longer connect the second son on the corner.
Of course, this is not necessarily a change, but it shows that the exchange of the actual battle Guli all the way and Li Chang's pickaxe is helpful for the dialogue to use means on the horn.
Let's continue to look at the actual battle --
Continuing, Coulee is safely alive in the upper right corner, and the partial white can be satisfied.
Since then, although the smell of robbery has remained, the current situation can be ignored, and in the process, the white 8 first pulls the effect in the 9th position.
It can be seen that the all the way of Lee Chang Ho Hei 1 did not achieve the desired effect.
However, although the local white chess is more successful, But Lee Chang-ho won the first hand, black 11, 13 preemptively started on the left, in the overall situation, black chess has quietly taken the lead.
Therefore, the relationship between the local and the global is a problem that we always need to think about when analyzing the chess game.
Next, let's take a look at the reference opinion given by ai -
(Variation Figure 4)
First of all, ai does not agree with Lee Chang-ho's all the way.
It is recommended that black develop on the left, such as black 1 jump or a, b touch, etc., there are many feasible means, so the situation is roughly two points.
After the actual battle black all the way up, Bai immediately started to work on the upper right, although the local success, but it is too early -
(Variation Figure 5)
For the white, the left side is also the focus.
In terms of specific techniques, white 4 touch is a compact good chess, after all, the black central block is not alive, so the white is profitable.
It seems that from the perspective of AI, the left side is the wider world.
Listening to ai's opinion, let's make a summary -
The two sides are tit-for-tat in the battle on the right, and if it is based on the theme of "all the way to the odd hand", both sides have wonderful performances.
Since then, Lee Chang-ho has taken the lead in developing the left side and achieved greater gains.
In the end, Lee Chang-ho once again eliminated Gu Li on the stage of the Toyota Cup.
Tidbits:
(Although Coulee was blocked by Lee Chang-ho in the 2nd and 3rd Toyota Cups, in the 4th Toyota Cup in 2008, Guli won the crown.) ）
summary:
Lee Chang-ho's 87 hands are superficially slow moves, in fact, the pursuit of efficiency, but from the perspective of the follow-up of actual combat, the upper right is not on the ground, the effect is not as expected, and it is possible to miss the initiative of the development of the left, so it cannot be called a magic hand, and it is more appropriate to name it as a strange move.
However, after that, Gu Li immediately started to work on the upper right, although there were wonderful means in the local area, but it was too early, and in the end, Lee Chang-ho took the lead in the overall situation.
In just a few hands, the situation changes rapidly, which is also the highlight of the top master showdown.