Since this shows the locations of moved pieces, it somewhat diminishes the usefulness of the Spy. So I'm thinking of giving it the ability to detect enemy attacks by either not letting it move though check or not letting it move into check.
Here is what I'm thinking of for the Spy. It would move like a Queen or a Knight, but it wouldn't be able to move to an attacked space, and it wouldn't be able to capture a piece with its own powers of capture. These restrictions would allow it to pick up on clues to the movement capabilities of other pieces. It would be weaker around strong pieces and stronger around weak pieces and a bit weaker than a Queen with the opponent's King. The restriction against capturing in the same manner as the piece it is capturing would substract eight from the Amazon's total moves, which is the same amount of extra moves the Amazon has over the Queen. And the restriction against moving to an attacked space would weaken it even further. But maybe I should reduce the strength of this exception, allowing it to move to an attacked space if it stops check against one's own King or is to the King's space. After all, a King is more important than a Spy, and the Spy could be allowed to sacrifice itself in extreme circumstances.
Here is what I'm thinking of for the Spy. It would move like a Queen or a Knight, but it wouldn't be able to move to an attacked space, and it wouldn't be able to capture a piece with its own powers of capture. These restrictions would allow it to pick up on clues to the movement capabilities of other pieces. It would be weaker around strong pieces and stronger around weak pieces and a bit weaker than a Queen with the opponent's King. The restriction against capturing in the same manner as the piece it is capturing would substract eight from the Amazon's total moves, which is the same amount of extra moves the Amazon has over the Queen. And the restriction against moving to an attacked space would weaken it even further. But maybe I should reduce the strength of this exception, allowing it to move to an attacked space if it stops check against one's own King or is to the King's space. After all, a King is more important than a Spy, and the Spy could be allowed to sacrifice itself in extreme circumstances.