This reminds me of David Sirlin's ill-named 'Chess 2' - one notable mechanic from there is that players have stones that they can use to bid when a piece is cap

This reminds me of David Sirlin's ill-named 'Chess 2' - one notable mechanic from there is that players have stones that they can use to bid when a piece is captured, and if the defender wins the bid, then the capture fails.