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There are more possible enhancements on espionage.
Useful would be to be able to mark opponents and own pieces:
1) mark pieces which I know opponent sees
2) mark pieces which I think opponent sees
3) mark opponents pieces with their guessed values
4) mark opponents pieces with their sure values
perhaps
5)mark with some user defined signs for some better association in notes
All marks about opponent pieces apply to hidden pieces so this could be done by changing their image.