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The tutorial game seems to have a bug.

https://google.github.io/boardgame.io/#/tutorial

Sometimes, turns are repeated. E.g. if a square is clicked and marked 0, then the next square that is clicked is also marked 0. Only happens sometimes though and I have only produced it on the first turn. I'm not sure what the cause is.

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Yeah, I filed https://github.com/google/boardgame.io/issues/9. The source in github does check if the cell is filled [1] but the demo code must be from an earlier version that didn't.

[1] https://github.com/google/boardgame.io/blob/master/examples/...

Seems like if you click on an already marked square it still counts as a turn, so if you double click you get this behavior.

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