Pig (dice game)

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The game of Pig is played with a single six-sided die Dice (504524747).jpg
The game of Pig is played with a single six-sided die

Pig is a simple dice game first described in print by John Scarne in 1945. [1] Players take turns to roll a single die as many times as they wish, adding all roll results to a running total, but losing their gained score for the turn if they roll a 1.

Contents

As with many games of folk origin, Pig is played with many rule variations, including the use of two dice instead of one. Commercial variants of two-dice Pig include Pass the Pigs , Pig Dice, [2] and Skunk. [3] Pig is commonly used by mathematics teachers to teach probability concepts.

Pig is one of a family of dice games described by Reiner Knizia as "jeopardy dice games", where the dominant type of decision is whether or not to jeopardize previous gains by rolling for potential greater gains. [4]

Gameplay

Each turn, a player repeatedly rolls a die until either a 1 is rolled or the player decides to "hold":

The first player to score 100 or more points wins.

For example, the first player, Donald, begins a turn with a roll of 5. Donald could hold and score 5 points, but chooses to roll again. Donald rolls a 2, and could hold with a turn total of 7 points, but chooses to roll again. Donald rolls a 1, and must end his turn without scoring. The next player, Alexis, rolls the sequence 4-5-3-5-6, after which she chooses to hold, and adds her turn total of 23 points to her score.

Optimal play

Optimal play for 2-player Pig was computed by Todd W. Neller [5] and visualized by Clifton G. M. Presser in 2001. [6] At any time, the relevant decision information includes the player's score, the opponent's score, and the turn total. Such information corresponds to a 3D point in the graph's space. If this point is inside the gray solid, the player should roll. Otherwise, the player should hold.

Many 2-dice variants have been analysed, [7] and human-playable Pig strategies have been compared to optimal play. [8] For example:

Variations

Two-Dice Pig

The game can be played with a pair of dice instead of one 160327 White dice 08.jpg
The game can be played with a pair of dice instead of one

This variation is the same as Pig, except:

Some versions of this game instead use 6 as the "bad" die face. [9]

Big Pig

This variation is the same as Two-Dice Pig, except:[ citation needed ]

Skunk

Skunk (or Think) is a variation of Two-Dice Pig that is played with large groups. Rather than rolling in turn, all players begin the round standing. At any point in the round, a player may hold by sitting down. The round continues until a 1 is rolled, or all players have sat down. Skunk is played in five rounds, and scoring is recorded in a 5-column table with columns labeled with the letters of the word "SKUNK". The first round score is entered in the "S"-column, the next in the first "K"-column, and so on. After five rounds, the highest-scoring player is the winner. [10]

Hog

Hog is played with a larger number of dice. On a player's turn, they choose any amount of dice to roll, and throw those dice. If they roll any 1s, they score zero for their turn; otherwise they score the sum of the dice. Play then passes to the next player. The game continues to a target score. [11]

Pass the Pigs

The two "dice" in Pass the Pigs Pass the pigs dice.jpg
The two "dice" in Pass the Pigs

The commercial game Pass the Pigs is similar to two-dice Pig, and is played with two small model pigs being thrown, similar to shagai bones.

In this game, a roll of left side and right side has the same consequences as rolling a 1 (i.e., the turn ends with the loss of the turn total), and a roll with pigs touching has the same consequences as rolling two 1's (i.e., the turn ends with the loss of the turn total and score). Pass the Pigs is similar to Frey's variant in that two pigs in the same non-side configuration score double what they would individually.

Teaching

Pig often serves as a simple example for teaching probability concepts from the middle school level upwards. The game also provides exercises for teaching computer science in areas ranging from introductory courses to advanced machine learning material. [12]

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References

  1. ↑ Scarne, John (1945). Scarne on Dice. Harrisburg, Pennsylvania: Military Service Publishing Co.
  2. ↑ Pig at BoardGameGeek
  3. ↑ Pig at BoardGameGeek
  4. ↑ Reiner Knizia, Dice Games Properly Explained. Elliot Right-Way Books, 1999
  5. ↑ Todd W. Neller and Clifton G.M. Presser. Optimal Play of the Dice Game Pig, The UMAP Journal 25(1) (2004), pp. 25–47.
  6. ↑ "Pig Visualizations". cs.gettysburg.edu.
  7. ↑ Todd W. Neller and Clifton G.M. Presser. Pigtail: A Pig Addendum, The UMAP Journal 26(4) (2005), pp. 443–458.
  8. ↑ Todd W. Neller and Clifton G.M. Presser. Practical Play of the Dice Game Pig, The UMAP Journal 31(1) (2010), pp. 5–19.
  9. ↑ "Pig Links". cs.gettysburg.edu.
  10. ↑ "missing". Archived from the original on 2005-10-31. Retrieved 2005-05-30.
  11. ↑ Bohan, James F.; Shultz, John L. (1996). "Revisiting and Extending the Hog Game". The Mathematics Teacher. pp. 728–733. Retrieved 26 January 2023.
  12. ↑ Todd W. Neller, Clifton G.M. Presser, Ingrid Russell, Zdravko Markov. Pedagogical Possibilities for the Dice Game Pig. Journal of Computing Sciences in Colleges, vol. 21, no. 6, pp. 149–161, June 2006.
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