Fix valid_chess_moves_notebook

[aaravnavani]

This PR fixes this issue and makes it so that guard.output_schema can access properties like move in the valid_chess_moves notebook.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

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  Coverage        ?   82.80%           
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  Files           ?       93           
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  Hits            ?     4767           
  Misses          ?      990           
  Partials        ?        0           

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[CalebCourier]

Hey @aaravnavani, thanks for the contribution! From what I can see this would fix the specific notebook in question where we first discovered the bug described in #430, but it doesn't necessarily address the underlying issue. If you're interested in pursuing a more wholistic fix we'd be more than happy to review. If not that's ok too, we might just change the PR title to something more specific like "Fix valid_chess_moves notebook".

[aaravnavani]

@CalebCourier I see. I'll rename this PR and create a new PR for the more wholistic fix. Thanks!