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This interested me enough to convince me to click through to the article itself. Is your observation allayed by this rule?

> Rule 2: a. Moves are tried in both orders, and only moves that are legal in both orders are merged. b. If both moves are legal in both orders but a different game state is reached in each order, neither move is merged.




GP is in response to

> All of these scenarios illustrate rule 2a. Rule 2b is in fact irrelevant for chess, because successful moves always commute.

in the article.


Thanks, I overlooked that




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