P=100, N=300, B=300, R=500, (N+B)=700, (N+R)=850, Q=900 seem to be good values on the 8x8 board. Grandmasters may find the Bishop to be (slightly) stronger than the Knight, but they have no need for tables like this. Ralph Betza has stated that 1600 rated players actually use Knights more effectively than Bishops - my 40 years of tournament experience confirms this.
Consider N=270 for CapaVariants on the 10x8 board. That is my only change: Bishops have the same maximum number of possible moves here as on the 8x8 board, while Rooks gain two more squares. So I am even more determined to value a Rook at '200' more than a Bishop. I am keeping the (N+R) piece within '50' of the Queen - based more on instinct than exact calculation. In short, trading Bishop for Knight (or Queen for Marshall) is risky, but I would hardly call it a game losing mistake.
Consider N=270 for CapaVariants on the 10x8 board. That is my only change: Bishops have the same maximum number of possible moves here as on the 8x8 board, while Rooks gain two more squares. So I am even more determined to value a Rook at '200' more than a Bishop. I am keeping the (N+R) piece within '50' of the Queen - based more on instinct than exact calculation. In short, trading Bishop for Knight (or Queen for Marshall) is risky, but I would hardly call it a game losing mistake.