Only pieces that stands on the rank in front of the allied king, the same rank as the king or on ranks behind the king can move.
Example:
Whites king is standing on the 3rd rank. White can move pieces that are standing on the 4th, 3rd, 2nd and 1st rank. White can not move his bishop on b5, so black is not in check.
Blacks king is standing on the 8th rank. Blacks pieces standing on the 7th and 8th rank can move. Black can not move his pawns on a6, d6 or g6.
Special example:
With the hungry horses event, white would normally be able to play Nxe5, Nxd7. However, after Nxe5, whites knight is not able to move again, since only whites pieces on the 3rd, 2nd or 1st rank can move.
Event #77 Leader in front
Only pieces that stands on the rank in front of the allied king, the same rank as the king or on ranks behind the king can move.
Example:
Whites king is standing on the 3rd rank. White can move pieces that are standing on the 4th, 3rd, 2nd and 1st rank. White can not move his bishop on b5, so black is not in check.
Blacks king is standing on the 8th rank. Blacks pieces standing on the 7th and 8th rank can move. Black can not move his pawns on a6, d6 or g6.
Special example:
With the hungry horses event, white would normally be able to play Nxe5, Nxd7. However, after Nxe5, whites knight is not able to move again, since only whites pieces on the 3rd, 2nd or 1st rank can move.