[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Paths
SequencingQuestions

Referenced by
GoTerms
33PointShoulderHit
BQM13
BQM65
33PointWith44Point
DirectedAcyclicGraph
3354Enclosure
3473Enclosure
SmallKnightExtens...
PushingBattlesInJ...

 

Transposition
Path: SequencingQuestions   · Prev: Tewari   · Next: IntermediatePlays
    Keywords: Tactics

Transposition is the process by which two differing orders of play lead to the same position. In Go, this occurs relatively rarely, but there are some occasions on which it is possible, particularly in the opening.

An example:

[Diagram]
Diag.: pseudo-nadare

Cho Chikun played this way against O Rissei in a recent Kisei match. Notably, this position can be turned into the Large Avalanche joseki:


[Diagram]
Diag.: Large Avalanche joseki

Of course, neither side is obliged to play this way (indeed, the Cho - O game rapidly went its own way).

- Andrew Walkingshaw

(Hu adds: Transposition is not to be confused with mirror symmetry or point symmetry (mane, or mirror, go.)



Here's one that could be missed.

[Diagram]
Diag.: Answering the pincer with a slow play?

White 2 is a bit unexpected, because it seems to be a slow-moving shape.


[Diagram]
Diag.: Joseki

When White's approach is the marked stone, White 2 is joseki. Therefore the previous diagram can't be so bad for White.

This isn't such a familiar sequence, perhaps; but that's because the pincer with Black 1 has been out of style for many decades.

Charles Matthews



The branching of variations of lines of play form structures that are called trees in mathematics (graph theory) and computer science, and increasingly in common parlance. When two branches grow together, the structure is called a Directed Acyclic Graph (DAG). The best SGF editors (such as CGoban2, gGo, etcetera) handle graphs very well, but do not handle DAGs at all.

- Hu of KGS


What do you mean by DAG capable?

Confused: I guess, that would be an editor, which brings you back to the main line (or another line) if a variation ends in a position that is already present in that line. This would be a cool feature to show, that both variations leads to the same end and the continuations from there are identical.


See also cyclic positions taxonomy.



Path: SequencingQuestions   · Prev: Tewari   · Next: IntermediatePlays
This is a copy of the living page "Transposition" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.