Professional Dangos

   

Dangos can be found by using pattern search in professional game databases. The following examples have been found in the Winter 2007 release of the GoGoD CD.


3x3 dangos

There are 244 3x3 dangos in the database (out of 50 078 games) including this interesting corner position:

[Diagram]
Move 130  

Cho Chikun (B) vs Matsumoto Tokuji (W), 1972-02-10, Black wins by resignation


3x3 dango analysis

Considering symetries, a 3x3 dango can be created with the 3 moves described here. We are interested in the percentage of wins in each case.

[Diagram]
 

When the dango is created by playing at B1, the game is won in 41% of the cases (83/200).

[Diagram]
 

When the dango is created by playing at B1, the game is won in 38% of the cases (16/42).

[Diagram]
 

No 3x3 dango has been created by playing at B1.
Considering the winning ratios, it doesn't seem a good idea to create such shapes.


3x4 dangos

They are 12 3x4 dangos in the database including this efficient living shape:

[Diagram]
 

Takemiya Masaki (B) vs Yamashiro Hiroshi (W), 1986-06-18,19, Black wins by resignation


4x4-1 dangos

They are no full 4x4 squares in the database, but it's possible to find 15 stones of the same color in a 4x4 square in this position:

[Diagram]
Move 217  

Rin Kaiho (B) vs Hane Yasumasa (W), 1985-07-25, White wins by 6.5 points


5x5-n dangos

To find bigger dangos, it is necessary to relax the constraints and remove several stones in the 5x5 square. The following example is a 5x5-6 dango (19 stones of the same color in a 5x5 square):

[Diagram]
Move 305  

Suzuki Ayumi (b) vs Nakazawa Ayako (W), 2003-12-22, Black wins by 11.5 points


Is it possible to find a better result?


Professional Dangos last edited by 24.179.64.211 on June 29, 2009 - 10:08
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