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  Ando Meritee's Blog
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An introduction of Taraguchi rule2008-04-22 19:27:13
Many people who perhaps have not deeply been involved with new opening rule discussions, may wonder about what is the difference between simple 5-swap (also called "Tarannikov") rule and Taraguchi rule.

Taraguchi rule is practically same as simple 5-swap rule , but it has one extra rule, ...
Ando Meritee2008-04-27 19:21:43
It is important to notice that in RIF rule as well as in Yamaguchi rule, the 5th moves can not be symmetrical in any aspect of the position. Only this way, every 5th move is unique and makes sense.

The same sense applies for Taraguchi rule. During the rules proposal period, some details where skipped in proposal texts, especially when the meaning was rather obvious, such as: "... the first player puts one of the 26 openings.." or "there will be five 5th moves offered...". Since RIF rule has already explained what openings are among 26 openings, also, what are the restrictions of playing 5th moves, so they were skipped from proposals in order to make it simpler. At that time nobody expect that people might misunderstand these brief rule suggestions.

Now that RIF is about to choose Taraguchi (or 3-swap version of it) as a certified rule, it is important to focus on detail this time.

If we forget to add this clause (symmetry is not allowed) into Taraguchi certified rule, then we will mess up the rule, as lots of nonsense situations may appear in game. For example in d8 opening standard position, black can offer 4 symmetrical versions of main 5th move, and plus one more own move freely as he likes, knowing that after that white cannot swap. (5a= g8, g7, i8, i7 and for example i9).

Such situation was not the original intention of people who proposed the rule. And also, it is against the renju tradition where all 5th moves should be unique. Therefore it is important to clear up this misunderstanding, and clearly state in rule proposal that symmetry not allowed.
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Ando Meritee2008-04-27 19:29:28
So the text of Taraguchi rule (5 swap) would be this:

- The black player puts the first move in the center of the board.
- The other player may swap.
- The white player will put the 2nd move within 3x3 central square.
- The other player may swap.
- The black player will put the 3rd move within 5x5 central square.
- The other player may swap.
- The white player will put the 4th move within 7x7 central square.

The choice 1 (after the 4th move):
- The other player may swap.
- The black player will put the 5th move within 9x9 central square.
- The other player may swap.
- The white player plays the 6th move anywhere on board.

The choice 2 (after the 4th move):
- The black player puts five 5th moves anywhere on board (symmetrical moves are not allowed).
- The white player chooses one of the offered 5th moves and plays the 6th move anywhere on board.

----------------------------------------------------------------------------------------------------
The 3-swap version of Taraguchi rule:

- The black player puts the first move in the center of the board.
- The white player will put the 2nd move within 3x3 central square.
- The black player will put the 3rd move within 5x5 central square.
- The other player may swap.
- The white player will put the 4th move within 7x7 central square.

The choice 1 (after the 4th move):
- The other player may swap.
- The black player will put the 5th move within 9x9 central square.
- The other player may swap.
- The white player plays the 6th move anywhere on board.

The choice 2 (after the 4th move):
- The black player puts five 5th moves anywhere on board (symmetrical moves are not allowed).
- The white player chooses one of the offered 5th moves and plays the 6th move anywhere on board.
 

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