The board with the 7 x 7 grid of squares should be made out of something that will stand up to being doused with beer on a fairly regular basis. We often use a chess board that has been taped off on two sides to eliminate the excess squares. There are many variotions of this medeival drinking game that can be found on the web. This is the most basic.
Basic Rules Designed by Steve Gray as submitted by Katrina Wolffe, the first centurian of Tablero (email@example.com)
Object of the Game: Make your opponent run out of beer before you do.
Starting the Game: Place your board on a flat surface. Three of the seven glasses are placed on each base line of the board starting from the right hand corner nearest each player. The seventh glass is placed in the exact center of the board. Find a spectator, preferably female, and have them roll the two dice. This is called the 'Queen's number' and will be important later. Each player fills the three glasses on his or her base line. Then, each player rolls one die. The player who rolls the highest number gets to choose who goes first. Whoever goes first, takes the center glass, places it one their own base line and has control of the dice.
Playing the Game: Seven, eleven and twelve are pass numbers. If a player rolls any of these he/she must pass the dice to their opponent. When the two dice have been rolled the player must move one glass, for each die, the number of spaces equal to the die If he/she cannot, then they must pass the dice to the other player. You are trying to line up six or seven glasses in a row either horizontally or diagonally. If the line is diagonal, it must be all seven glasses from corner to corner on the board. When a line is made, the player who made it gets to "pull" the line. The player who made the line MUST drink at least half of the glasses in the line. If the line was seven glasses he/she must drink four of them. It is customary to give your opponent at least one glass. The others may be distributed as the winner of the line sees fit (to his/her opponent, to spectators or he/she can be greedy and drink the remainder themselves).
The empty glasses are place on the base line of the person who DID NOT make the line. He/she must then fill them from their own stock of beverage and then gets control of the dice. If a Queen's number is rolled, the player is allowed to choose one glass from anywhere on the board, toast "To the Queen", drink the contents of the glass and place it on his/her opponents baseline. The opponent must then fill the glass from their stake. The person who rolled the Queen's number retains control of the dice. IF you do not "call" the queens number before you pick up the dice to roll again, your opponent may then call it and get to drink the toast. The glass then goes on the base line of the person who rolled it and they must fill it. They do, however, retain the dice and continue with their turn. If the opponent does not call queen's number before the dice are rolled again, then the opportunity is lost for everyone.
The first person to not be able to fill a line loses the game. It is not considered good form to win on a "Queen's Number". To this end, if you roll a "Queen's Number" and drink the toast, if your opponent cannot fill the glass, the glass still goes on your opponents base line, but the person who rolled it must then fill the empty glass. Again, the player who rolled it still retains control of the dice.
The Toast Round: After the last line has been won, the winner fills whatever glass his/her opponent was not able to fill and declares the toast round. The winner generally takes half of these glasses for themselves, and passes the rest around for the toast. The winner makes a toast and every one drinks up and then places the glasses back on the board. The winner now has control of the board and may take on other challengers if he/she so wishes.