Source for all variants: book 'Board and Table Games I' by R.C. Bell.
 
Object: The 2 Leopards try to kill all 24 Cows. The Cows try to trap the Leopards.
 
You start by placing one of your Leopards. Capture is by jumping. You may move as soon as the second Leopard is dropped. Moves are orthogonally or diagonally.
 
The Cows can only move when all are dropped. The Cows cannot capture.
 
Since in the original game the Cows have an easy win, I added the following three versions:
Variant 2: the Cows may not be dropped at any of the 12 corners of the board.
Variant 3: there are only 20 Cows vs 2 Leopards.
Variant 4: No cowdrops at corners, here are only 20 Cows vs 2 Leopards.
 
Variant 5: a version of the game '16 Soldiers'.
Variant 6: the game '23 Soldiers'.
 
 
For more freeware as well as real puzzles and games see my home page http://karl.kiwi.gen.nz.