*形形色色的双飞燕序 II*

Primary Sequence 2
Primary Sequence 2

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Primary Sequence 2, White 2 hasami (ハサミ or 夹) , Black 3 double-pincer creates sparrow attack, when White 4 presses, Black 5 hit san-san (三々 or 三三), this is Korean’s favourite joseki, it is one of the famous joseki in Go world now, what is the expected follow-up?

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Diagram 14
Diagram 14

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Diagram 14, When Black 2 hit the corner, White 3 obviously simplified the situation, however the result until 4 considerably favourable for Black. If comparison with the Primary Sequence 1 from previous post [http://bit.ly/92DEaa], noticeable: Due to the fact that Black does not have a exchanged with White b, thus the forcing move of White c is not as powerful as it is – Black can tenuki (脱先 or 手抜き), White d peek is not profitable as well.

The differences are obvious.

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Diagram 15
Diagram 15

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Diagram 15, Thus, when Black 2, it is very likely that White 3 will block, ended up until 8. When White 9 hasami, Black 10, 12 hane connected value is big, furthermore that Black has a to exploit later, this result is considerably even by both.

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Diagram 16
Diagram 16

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Diagram 16, White 8 chose to nobi down, is also one of the strongest tactic. If Black 9 has decided to block, White 10 thus hasami, Black triangle-marked became immobilise . Black 11, 13 hane out, until move-23 has became a “change in strategy”.

In the diagram [Diagram 16], despite Black managed to surround White-14 group, White has more tactic in exploitation, thus either player still playable.

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Diagram 17
Diagram 17

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Diagram 17, When Black 10 blocks, White 11 hane first is interesting move, Black 12 then forced to nobi, otherwise White 12 would be absolute sente. Hence, White 13 got good point.

In this diagram [Diagram 17], Black a hane out has been eliminated [Diagram 16], White is happy.

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Diagram 18
Diagram 18

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Diagram 18, When White 1 nobi, Black 2 took initiative to take big point could be treated as a tactic. White 3 jump into san-san, Black 4 dug out, ended 27 is an normal procedure.

In this Diagram [Diagram18], White is thick, Black has sente in hand, speed in fuseki, thus it would be a speed versus thickness layout kind of game.

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Diagram 19
Diagram 19

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Diagram 19, When White 3 blocks, Black 4 hane is to ask for an opportunity to change, the following White 5, Black 6 made their own. When Black 7 presses out, Black 8 is to make the light, if it would be played at a hane thus White b would definitely go nobi.

In This Diagram (Diagram 19), it is uncertain to judge who is better.

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Diagram 20
Diagram 20

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Diagram 20, White 6 connect is also a tactic, Black 7 connect is absolute, when White 8 hane. Black 9 ogeima if changed to 10 hane, then White a – Black b – White c – Black d, Then White would have gotten all the left side development.

Black 11 hane from corner, White 12 hane replied to compete for 14 keima kakari in sente, later if Black e cut, White f will then invade.

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*Example Game*

Professional Game
Professional Game

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Professional Game, A game of Cho Hunhyun (曺薰鉉).

The variation of bottom left reaches 29 do not have much variation compared to Diagram 16. White 30 keima invade is a good point,  Black 31 can be played also at a kosumi. Black 39 contact play reaches 53 creates a fighting layout.

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