Thank you for making gobang better!

Here's a checklist for things that will be checked during review or continuous integration.

- \[ ] Added passing unit tests
- \[ ] `cargo test` passes locally. It takes much time.
- \[ ] Run `cargo fmt`

Delete this line and everything above before opening your PR.

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*Please write a short comment explaining your change (or "none" for internal only changes)*

changelog:
