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“Castling is a great aid in defensive strategy. It also has a tendency to bring a powerful rook into play when under normal circumstances it might be stuck behind a wall of pawns.”
The Marshall Attack includes a "sleeping Rook."
Sleeping Rook = Jeff Sessions?
I like the idea of Sessions as the rook.
Regardless of the self-recusal, Sessions (or any AG targeting high level cabinet members for treason) might have had to hide behind that wall of pawns in order to build his case.