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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:
Cho Chikun played this way against O Rissei in a recent Kisei match. Notably, this position can be turned into the Large Avalanche joseki:
Of course, neither side is obliged to play this way (indeed, the Cho - O game rapidly went its own way). (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.
White 2 is a bit unexpected, because it seems to be a slow-moving shape.
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. 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. 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. ![]() |