*形形色色的双飞燕*

Primary Sequence
Primary Sequence

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Xinwen had decided to offer up lecture series here, all these teaching had already showed and explained in KGS at 20 00 (GMT+8), most of the night.

Primary Sequence; looking at White pincer at 2, Black 3 pincer back, followed up until 9, is a commonly seen shape,  how should white continued after this? From the diagram [Primary Sequence], if White tenuki, Black a connect is strong move.

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*Double  Sparrow*

Diagram 1
Diagram 1

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Diagram 1,  White 10 kosumi, preventing Black to a connect, Black 11 extension cannot be omitted, otherwise White b forcing press is very critical.

White is in position of sente in the diagram, thought to be evenly in progress, but Go Seigen(吴清源) gave a different opinion, he thought that White is better, because both player has the same number of moves, the ration of thickness cannot be measured.

Furthermore, Nie Weiping (聂卫平)had also agreed that White slightly better, in limitation. He pointed that in future White c create minor problems, Black’s loss isn’t severe.

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Diagram 2
Diagram 2

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Diagram 2, in this diagram though White 10 has a kosumi or b bent cover, However playing White 10 at second row isn’t a trend lately.

The advantage of White 10: When Black approach at c area, White can tenuki due to the thickness of the shape. Thus, this move has been considered by many strong player.

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Diagram 3
Diagram 3

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Diagram 3, White 1 pressed directly, sought to come from both sides, Black 2 helped to prevent White to peek at a spot, thus also benefit in sente. However this diagram, White has outward influence, also later if White b will be equally beneficial, black has bit loss.

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Diagram 4
Diagram 4

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Diagram 4, Regarding the White 1 pincer, Black 2 is a thick hand, White 3 cover up, Black can tenuki. This diagram has proven an effective measure for White a, Black is better in result than Diagram 3.

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Diagram 5
Diagram 5

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Diagram 5, Black 2 kosumi, while preventing White to steal Black’s territory away, also helps to forcefully head outward,  to emphasise the effectiveness of moves, ended at followed-up at 7, possibly playable for both.

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Diagram 6
Diagram 6

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Diagram 6, When White 1 pincer, Black 2 pressed, is again strong move, After White 3 hane exchanged with Black 4, a spot has disappeared, White 5 covered, Black 6 cut has big value, Black is satisfied in this diagram.

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Diagram 7
Diagram 7

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Diagram 7, When Black 2 pressed, White 3 hit the peek first is a variation from previous Diagram 6, Black 4 connect is absolute, White 5 hane now creates a different situation. When White 7 connects rescued the 3-stones, Black 8 started to activate and fight with White.

White has advantage in this battle.

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Diagram 8
Diagram 8

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Diagram 8, When White 7, Black 8 hane is considered strong move, White 9 covered, Black 10 exchanged with White 11 then covered at 12. Result is even.

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*Example Game*

Professional Game
Professional Game

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Professional Game, This is one of the game by Cho Chikun (White) and Kobayashi Satoru (Black).

Black 9 –  11 launched the sparrow, followed up to 16 is common shape.  When White 18 pincer, Black pressed, White 20 – 24 is an immediate changing moves, then white took the initiation at 26 big cut. After Black 25 cut, and because of that White 20 made a bad exchange with Black 21, thus black gotten profitable outcome.

However White 32 made extreme good move, until 36, White gave up small profit of the game and chose to speed up the development. Overall, White lively and active.