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Board games 3D/2D UI and AI web library

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<h2>Board and pieces</h2> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/setup.png"/> The board in a double ring of 40 squares made from a 7 x 7 with a 3 x 3 hole in the center. There is an inner ring and a outer ring. Also, it is convenient to see 4 zones, South, West, North and East. Each side has 6 pieces only: 1 King, 1 Bishop, 2 Rooks and 2 Pawns. White plays first. All captures are by displacement as for Chess. <h2>Moves and Rules</h2> The play is mostly clockwise: generally speaking, the pieces move mainly ahead and have only limited motion backward. At every corner of the board, the pieces rotate 90°. Details follow. All pieces change their orientation (rotating 90° clockwise) when they land on a corner or bend space (a1, b2, a7, b6, g7, f6, g1, f2). <img style='max-width:100%' src="{GAME}/res/rules/rollerball/directions.png"/> <h3>King</h3> The King moves and captures exactly as in Orthochess to any adjacent square but never to a square where it can be captured. It is the only piece to have a symmetric move. <img style='max-width:100%' src="{GAME}/res/rules/rollerball/king1.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/king2.png"/> <h3>Rook</h3> The Rook slides any number of squares forward or sideways along the row or column. Also, it can move 1 square only orthogonally backward. It never slides backward. On the external ring, they have one rebound allowed on the corners of the board. <img style='max-width:100%' src="{GAME}/res/rules/rollerball/rook1.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/rook2.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/rook3.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/rook4.png"/> <h3>Bishop</h3> The Bishop slides diagonally forward any number of squares with one rebound allowed on the sides, external and internal, of the board. Also, it can move 1 square diagonally backward. It never slides diagonally backward. One may note that the white diagonals are forming another ring joining the mid-points of the external sides. The Bishop is very powerful there. <img style='max-width:100%' src="{GAME}/res/rules/rollerball/bishop1.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/bishop2.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/bishop3.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/bishop4.png"/> (It can go to a2 only if it goes through b1) <img style='max-width:100%' src="{GAME}/res/rules/rollerball/bishop5.png"/> <h3>Pawn</h3> The Pawn moves and captures forward straight or diagonally. When reaching the starting square of opposite Pawns it promotes to either a Rook or a Bishop. (Promotion to a Bishop upon dark squares is not recommended) <img style='max-width:100%' src="{GAME}/res/rules/rollerball/pawn1.png"/> <img style='max-width:100%' src="{GAME}/res/rules/rollerball/pawn2.png"/> (b1 is ahead when Pawn is on c2) <img style='max-width:100%' src="{GAME}/res/rules/rollerball/pawn3.png"/> (b2 is sideway when Pawn is on b1 because it has not turned yet) <img style='max-width:100%' src="{GAME}/res/rules/rollerball/pawn4.png"/> (b2 is ahead when Pawn is on a1, because it has turned) <img style='max-width:100%' src="{GAME}/res/rules/rollerball/pawn5.png"/> <h2>End of the Game</h2> There are 2 ways to win the game: <ul> <li>Ckeckmate the opposite King</li> <li>When the King reaches the starting square of the opposite King, but only if had turned clockwise.</li> </ul> Pat is a draw. A 3 times repetition also.