I was using the chess replayer earlier and couldn't get it to castle. It turns out that I was typing 0-0 and the replayer only recognises O-O.

I couldn't find anywhere on the chess meta explaining which notation to use for castling and both forms are viable to notate a castling move.

Would it be worth making a small change so that we can use both O and 0 in the replayer?

1 Answer 1


There was a pull request for this on GitHub, but it was not accepted based on the reasoning that O-O is the common and “correct” notation.

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