An idea I was having is for there to be pieces that can only capture or be captured by enemy pieces of certain colors. So for instance red might have some pieces that can capture or be captured by red pieces, but not by yellow or blue pieces, and some that can only capture blue and yellow pieces, but not green pieces.
If for instance in this position the green rook was only allowed to capture or be captured by yellow pieces then it would not be allowed to capture the blue bishop, and the red amazon could not capture it, but if the yellow knight was something that was allowed to capture a piece of any color, then the yellow knight could capture the green rook.
In this example, if the red queen was only allowed to capture or be captured by blue or yellow pieces, but not green pieces, but the red rook could capture green pieces, and the green king was allowed to capture red pieces, then red would not be in check, as the red queen would not be allowed to capture the green king, and the red king also could not capture the red queen, but the red king would be allowed to capture the red rook.
If in this position the green rook was allowed to capture or be captured by pieces of any color, but the yellow king was only allowed to capture or be captured by blue pieces, then yellow would not be in check as the yellow king could not be taken by the green rook, even if it was greens turn to move, and the yellow king could also not capture the green rook.
An idea I was having is for there to be pieces that can only capture or be captured by enemy pieces of certain colors. So for instance red might have some pieces that can capture or be captured by red pieces, but not by yellow or blue pieces, and some that can only capture blue and yellow pieces, but not green pieces.
If for instance in this position the green rook was only allowed to capture or be captured by yellow pieces then it would not be allowed to capture the blue bishop, and the red amazon could not capture it, but if the yellow knight was something that was allowed to capture a piece of any color, then the yellow knight could capture the green rook.
In this example, if the red queen was only allowed to capture or be captured by blue or yellow pieces, but not green pieces, but the red rook could capture green pieces, and the green king was allowed to capture red pieces, then red would not be in check, as the red queen would not be allowed to capture the green king, and the red king also could not capture the red queen, but the red king would be allowed to capture the red rook.
If in this position the green rook was allowed to capture or be captured by pieces of any color, but the yellow king was only allowed to capture or be captured by blue pieces, then yellow would not be in check as the yellow king could not be taken by the green rook, even if it was greens turn to move, and the yellow king could also not capture the green rook.