AI-Improvements. Battery use improvements. Notation additions.
Move up to the 4th level of chess! Quadlevel was invented in 1970, and has been played as a version of 3D chess since that time. The same feel of movement is here as in regular chess by now you have a 'Z-Axis' movements. Some diagonals are a little hamstrung by the 4-square space. You'll find the game-length is roughly the same as regular chess. See http://www.chess3d.com
