Regarding number 4) this seems very similar to the board game Stratego [1] where part of the squares can not be stepped on. Also you only see your opponents pie

Regarding number 4) this seems very similar to the board game Stratego [1] where part of the squares can not be stepped on. Also you only see your opponents pieces when you attack! [1] https://en.wikipedia.org/wiki/Stratego https://en.wikipedia.org/wiki/Stratego