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

sdk-pytest-checkmate
0.3.0a6

This version was deleted from PyPI around 2025-10-25. Installing fails with:
$ pip3 install sdk-pytest-checkmate==0.3.0a6 ERROR: Could not find a version that satisfies the requirement sdk-pytest-checkmate==0.3.0a6
View other deleted versions of sdk-pytest-checkmate

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/2025-10-24/ \ sdk-pytest-checkmate==0.3.0a6
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Or, download files manually

And install manually via pip:
sdk_pytest_checkmate-0.3.0a6-py3-none-any.whl (23.0KB)
sdk_pytest_checkmate-0.3.0a6.tar.gz (33.9KB)