Here are the number of 1 piece positions sorted by leading checker rank.

1000.00: 32

0010.60: 4
0010.50: 4
0010.40: 4
0010.30: 4
0010.20: 4
0010.10: 4
0010.00: 4

0100.00: 32

0001.06: 4
0001.05: 4
0001.04: 4
0001.03: 4
0001.02: 4
0001.01: 4
0001.00: 4

Total number of positions: 120