Invasion is a military inspired Chess variant played on a 84-cases board.
The board has 84 squares formed by a 10x10 field with a central 4x4 sea where no piece can enter, stand nor play.
Two players are opposed and stand on their fortress on NW and SE respectively.
 
Each player has an army with :

• 1 Head Quarters, which capture is one goal of the game. The HQ is defenceles but is very mobile. The HQ is immune from Bomb explosion.
• 2 Flags, also defenceless, which play an important role as they can turn on the Bomb and even win the game !
• 2 Commandos, very mobile and which are able to shoot enemy pieces.
• 2 Paratroopers, which can make a long hop once in the game, being the only piece able to fly over the sea. They also shoot enemy pieces.
• 2 Tanks, dreadful pieces which slide several squares and crush all pieces, enemy or friend, on their road.
• 12 Troopers, defensive pieces, which can promote to either Commando or Paratrooper when reaching the opposing camp.
• 1 Bomb, which stands off-board at the beginning in an off-state. When set on by the Flag, it can be dropped anyway on the board and explode killing all pieces (except HQs), enemy or friend, around itself.

• capitulation : checkmating or stalemating the opposite HQ or
• invasion : standing a Flag on the opposite HQ corner.