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|Isaac is a two-player abstract board game invented by Emiliano “Wentu” Venturini in 2011.|
|Board and Pieces|
Isaac is played on a 10x10 board. There are two players: Dark and Light. Each player has 15 rectangular tiles of 5 different sizes. Each tile has a score written on it. Each player also has 1 score counter used in the second phase of the game (see below). Note that the board has two opposite grids of coordinates: one for the Dark player and the opposite one for the Light player. On the following illustration the bottom left corner of the board is 00 and the top right corner is 99 according to the Dark coordinates. The same corners have the opposite coordinates (00 for the top right corner, 99 for the bottom left corner) for the Light player.
|The goal of the game is to be the first player scoring at least 100 points during the second phase of the game (see below) or being the player with the most points at the end of the game.|
The game consists of two phases: the placement phase and the scoring phase.
The placement phase begins with an empty board.
Starting with the Dark, players take turns placing one of their tiles per turn onto unoccupied cells of the board.
If a player cannot put any of his remaining tiles on his turn then he passes and the other player puts any tiles he can.
The placement phase ends when both players don't have space to put any of their tiles on the board. All the remaining tiles are set apart and serve the role of the tiebreaker. If both players get the same score by the end of the scoring phase, each player forms a line with all his unplayed tiles and the player with the longest line of the unplayed tiles wins the game. If the lines are of equal length, the player who started the game wins. Note that the length of each tile is not a round number of board squares but a little bit shorter.
At the beginning of the scoring phase both players have 0 points. To indicate this both players put their score counter on the 00 square according to their own coordinates (i.e. on the leftmost square of the line in front of them). If the mentioned square is under some tile, the score counter goes on top of this tile.
The first player that passed in the Placement phase begins the Scoring phase. The players take turns removing one of their tiles from the board. The removed tile must be at least as long as any tile previosly removed by the same player (e.g. if a player has previously removed a 4-cells tile then he can't remove his 3-cells tiles anymore). A player may not remove a tile lying under a score counter (of any color).
For each removed tile a player scores points in the following way:
The final result is the score earned by the removal of the tile. It indicates the maximum number of squares that the player's score counter may be moved. E.g. if the player's score counter is located on 45 and the player earned 24 points then he may move his score counter to any square from 45 (i.e. to leave it where it is) to 69 (45+24).
The counter may be placed over a tile (of any color) still on the board but not in the same cell as the opponent's counter.
The game ends when any player scores at least 100 points. If a player cannot remove any of his tiles on his turn, he passes and is out of the game. The game ends when both players have passed.
Below are several examples of scoring moves:
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