You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.

checkmate2
4.0.66

This version was deleted from PyPI around 2024-12-06. Installing fails with:
$ pip3 install checkmate2==4.0.66 ERROR: Could not find a version that satisfies the requirement checkmate2==4.0.66
View other deleted versions of checkmate2

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2024-12-05/ \ checkmate2==4.0.66
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Or, download files manually

And install manually via pip:
checkmate2-4.0.66-py3-none-any.whl (179.8KB)
checkmate2-4.0.66.tar.gz (147.2KB)