Classical Petteia (Poleis, Cities or the Game of Pebbles) was an ancient Greek game traditionally believed to be played by Ajax and Achilles during the Trojan War (c. 1194-1184 BC).
Petteia XXI is a variation of the ancient Greek game, expanding on the classical rules and adding new tactics which allow a modern 'XXI' (a.k.a. 21st) century player to force a win on his/her opponent, while minimizing the number of draws or blocked positions.
Petteia XXI is played with light and dark pieces, checkers or stones initially lined up on opposite sides of the board. It can be played in various size boards: 8x8, 10x8 or 12x8.
The objective is to stalemate the opponent or to capture his entire army.
Classical captures (custodial and corner) apply to Petteia XXI in addition to the following capturing tactics:
Push and Crush Attack
Flank Attack
Phalanx Attack
Aditionally, Petteia XXI has locked soldiers (similar to blocked pawns in Chess) which strategically limit pieces mobility to increase capture opportunities, and to minimize the chances of draws.
http://www.chessvariants.com/invention/petteia-latrunculi-xx...