Clatsop

clatsop is a compact native-32-bit model for American checkers boards, turns, primitive rules, and rulesets.

The core public objects are:

• Board, a tuple-like set of black, white, and king masks.
• Turn, a Board plus side-to-move and optional metadata.
• Rule, three condition masks plus packed move metadata.
• Ruleset, the 366-rule American checkers primitive-rule table with filterable and sortable visual displays.
• Packed 97-bit state keys and allocation-light expansion methods for tablebase generation.

The validated model API is intended for notebooks and inspection. A separate packed-state path supports large hash-based searches while preserving the same rules and mandatory-capture behavior.