[theEinari]

Thanks. The 3 player seems to be working.

I was thinking the same c1 c8 f1 f8 for 4 players but was thinking is there a simple way to get both light and dark squared bishop for both teams. Since teams are white-red vs black brown the c1 c8 f1 f8 would leave white-red team with 2 bishops on light squares and black-brown team with 2 bishops on dark squares.