Jörg Knappen wrote on Sun, Oct 7, 2012 10:39 AM UTC:
Here's the position for mutual perpetual check with bishops and
nightriders. You need two bishops on the same field colour (or a queen and
a bishop); a position with bishops on different colour does not exist
because the kings come too close to each other.
Bishop's team: Ba2, Bb1; K b3/c2
Nightrider's team: NN f8, NN h6; K e6/f5
... it just fits on an 8x8 board.
