Comment by TheOtherHobbes
11 hours ago
Unlike en-passant and castling, pinning and discovered checks are consequences of lower-level rules.
At the "Is this move legal?" level, they don't need unique rules of its own if the lower-level rules are specified correctly.
3.9.2: no piece can be moved if that exposes or leaves its own king in check.
That's a consequence of not being allowed to put yourself in check (by any means).
The only way to put yourself in check is by moving.
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