Anderssen - Staunton 1851: Game 1, after Black's 23rd Move

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A fascinating position, not as much for the position itself as for the applicability of the King's Rook's stamp on Jaques sets.

The White King is in check by the Black Queen on d5. Note the White Rooks on f1 and h3 - which one will interpose to stop the check? Nowadays we would write "Rf1-f3" or "Rh3-f3", because the usual "Rf3" is ambiguous. In Staunton's day, however, the move was written as "Q. R. to K. B's 3rd." But which rook is the Queen's Rook?

Hence the so-called improvement for Jaques Staunton sets: the ambiguity is resolved by a small King stamp on Jaques King-side Rooks and Knights. White's Rook on h3 (K. R's 3rd) has the small King stamp, signifying it as the King's Rook, and the Rook on f1 has no stamp, signifying it as the Queen's Rook. Hence, the move "Q. R. to K. B's 3rd." means (in today's terms) Rf1-f3.