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Slyde is a territory game invented by Mike Zapawa in 2020.

Play Slyde interactively or against AI

Rules
• Group: a set of connected, like-colored pieces on the board.
• A group's size is the number of pieces that it contains. Pieces come in two states: mobile and fixed. Fixed pieces remain immobile for the rest of the game.
• To swap: to exchange a mobile piece of one's own with an adjacent mobile piece of the opponent. The swapping player's piece then becomes fixed, the opponent's piece remains mobile.
• One player owns the white pieces and the other owns the black pieces. The players take turns swapping one piece. White begins.
• The game ends when no more moves can be made. The player who controls the biggest group (defined by orthogonal connectivity of like-colored pieces) is the winner. If this results in a tie, then second-biggest groups of both players are compared; if that fails too, third-biggest and so on. A draw is only possible when both sets of pieces are partitioned in the same way.

The game starts on a full 12x12 board with pieces alternating in a chessboard pattern. Consider the squares to be the pieces.

 In the diagram White opened with f3-f4 and Black replied with the symmetrical f10-f9. White then played k6-j6 and Black replied with the symmetrical k7-j7. Mirroring strategies can be quite a nuisance, so there’s a special move to discourage them. If a symmetric position arises, the next player to move can choose to change the state (mobile to fixed or vice versa) of any pawn regardless of color instead of performing the standard swap. So here White instead of swapping could say fix one of the pieces of his 4-group, or 'unfix' f9.

Note
Slyde is a territory game using a somewhat unusual definition of territory. As long as they differ in size, players' territories consists of their largest groups. If these are the same size, then players' territories consists of their largest groups plus their 'next in size' (which may be the same size as the previous one), unless these territories are equal in size too, in which case the groups next in size are considered and so on, till an unequal territorycount results. A very strong incentive to always keep an eye on the overall situation, and not focus on the largest group alone.

Here's an example game between Simon R. (White) and the inventor:
no Sound
Broken canvas...
to move
 0 0

"Slyde as it should be": Simon R - Mike Zapawa (1-0)