The objective is to be the first player to move their pawn to any space on the opposite side of the game board from which it begins.

Walls are flat two-space-wide pieces which can be placed in the groove that runs between the spaces.

The walls are divided equally among the players at the start of the game, and once placed, cannot be moved or removed.

On a turn, a player may either move their pawn, or, if possible, place a wall.

However, a wall may not be placed which cuts off the only remaining path of any pawn to the side of the board it must reach.

Quoridor is based on an earlier game, namely Blockade (also known as Cul-de-sac), invented by Philip Slater in 1975.

Pinko Pallino was only for two players and was played on an 11×11 game board with a total of 42 walls and slightly different rules.

Many European educational institutions (e.g., MindLab) have also selected Quoridor as teaching aids and brought them into the classroom.

A wall move is denoted by the closest square to a1, with a horizontal h or vertical v orientation.

Unorthodox openings are uncommon and use two or more wall moves before one's pawn reaches e4 or e6.

[citation needed] The analysis was done using an implementation of the Minimax algorithm and different heuristics.

A common idea is to close the back rank with a vertical wall.

(i.e. e1v) So, the opponent cannot make the Stonewall player to go back all the way behind the wall.

Obviously route 1 would be closer to the destination, so second player blocks the shorter path with 2.__ f8 3.e6h.

__ h9 6.h4h i9 7.f4h i8 8.b5h i7 9.a6v c6h) The aim of the strategy is to create redundant moves for the second player in a direction that will inevitably be blocked in the future.

With this move a horizontal wall on the left side is placed, exactly 2 spaces from the edge of the board.

The goal is to create up to 3 different wall layouts to block the detour to your left.

In the midgame both players tries to maximize the possible opponents paths (most commonly 2) and close their back.

Nonetheless, if the movable area lacks space, this may result in a loss because if none of the moves increases the path length of the opponents' they become useless.

There are different board sizes of the game: Pocket < Mini < Standard < Deluxe < Giant Quoridor Kid: In 2004 Gigamic released the Children's version.

The board is round and yellow, where classic figures are replaced with a mice.

The top is in the shape of a mouse, and a cheese top is placed in the back of the row on the other side, adding the theme of "a mouse is trying to reach the cheese."

The Children's version of the game Quoridor Kid won four awards.