TomVerhoeff. Technische Universiteit Eindhoven Faculty of Math. & Computing Science Software Construction
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1 Optimal Solitaire Yahtzee Strategies TomVerhoeff Technische Universiteit Eindhoven Faculty of Math. & Computing Science Software Construction *) Yahtzee is a registered trademark of the Milton Bradley Company. c , Tom Verhoeff Yahtzee 1
2 Micro Yahtzee: Equipment & Rules ONE fair die : values 1 [ ] to 6 [..], equiprobable TWO primary categories on score card, each used once: Category Double Square TOTAL Score value doubled value squared sum above PLAY: roll, choose category, score, roll, score in other category AIM: maximize total score Yahtzee 2
3 Micro Yahtzee: Dilemma Empty score card: Category Score Double... Square... TOTAL... What to do if first roll is 4? Score 8 in Double? Score 16 in Square? Yahtzee 3
4 Game Tree roll Turn 1 Turn 2 choose roll choose Begin Dbl Sqr Sqr End Yahtzee 4
5 Micro Yahtzee: Analysis Number of games: =72 Number of deterministic strategies: =64 Probability of each game: = Yahtzee 5
6 Solving Micro Yahtzee Dice rolls are independent: probability of game is product Event scores are independent: total score is sum Merge equivalent states Game Graph For each state, compute optimal expected additional score Start at the end (without choice), work backwards Yahtzee 6
7 Micro Yahtzee: Game Graph Begin Double Square En Square Double Roll Choose Roll "Choose" Copyright (c) 2004, Tom Verhoeff
8 Micro Yahtzee: Expected Scores 1/6 x 1/6 x 1/6 x 1/6 x /6 x /6 x /6 x /6 x Roll Choose Roll "Choose" Copyright (c) 2004, Tom Verhoeff
9 25 17/18 Micro Yahtzee: Optimal Expectation 1/6 x 1/6 x 1/6 x 1/6 x 17 1/6 19 1/6 21 1/ / /6 x / /6 x 1/6 x /6 x Roll Choose Roll 12 "Choose" Copyright (c) 2004, Tom Verhoeff
10 Yahtzee Equipment 5 Dice: values 1 to 6, equiprobable 1 Score Card: 13 primary categories Yahtzee 7
11 Yahtzee Score Card Category Score Aces... Twos... Threes... Upper Fours... Fives... Section Sixes... Upper Section Bonus... Three of a Kind... Four of a Kind... Full House... Lower Small Straight... Large Straight... Section Yahtzee... Chance... Extra Yahtzee Bonus... GRAND TOTAL... Yahtzee 8
12 Official Yahtzee Playing Rules Take empty score card repeat Roll all dice Keep any dice, reroll other dice Keep any dice, reroll other dice Score roll in any empty primary category until all primary categories scored Calculate GRAND TOTAL for final score *) Player is free to choose among options Aim : Maximize final score Yahtzee 9
13 Official Yahtzee Scoring Rules Category Condition Score Aces sum 1s Twos sum 2s Threes sum 3s Fours sum 4s Fives sum 5s Sixes sum 6s U. S. Bonus U.S.Tot once Three of a Kind 3 equals sum values Four of a Kind 4 equals sum values Full House 2+3 equals 25 Small Straight 4inseq. 30 Large Straight 5inseq. 40 Yahtzee 5 equals 50 Chance sum values Extra Y. Bonus 5 equals & 50 at Y. 100 each GRAND TOTAL sum above Yahtzee 10
14 Joker Rule *) 5 ys act here as Joker, provided Category ys in Upper Section has already been scored, and Yahtzee has already been scored Yahtzee 11
15 Dilemmas First turn, first roll: What to do? Keep 6 6 6? Keep all and score 25 in Full House? First turn, second roll: What to do? First turn, third roll: What to do? Score 24 in Sixes? Score 25 in Four of a Kind? Yahtzee 12
16 Random Play (without Bonuses and Jokers) Expected Category Probability Score Aces Twos Threes Fours Fives Sixes Three of a Kind 1656/ Four of a Kind 156/ Full House 300/ Small Straight 1200/ Large Straight 240/ Yahtzee 6/ Chance GRAND TOTAL Yahtzee 13
17 Optimality Criteria Maximize expected final score Minimize variance in final score Maximize probability to beat High Score Maximize probability to beat opponent Maximize minimum final score Yahtzee 14
18 roll all choose keepers reroll others choose keepers reroll others choose category Yathzee Turn Tree node 6 5 nodes Yahtzee 15
19 Yahtzee Game Tree Number of games: ( ) 13! Game probabilities: range from ( (6 5 ) 3 ) to ( 6 5 ) Number of deterministic strategies: ?? Yahtzee 16
20 Reduced Yathzee Turn Graph 1node roll all choose keepers reroll others choose keepers reroll others choose category nodes Yahtzee 17
21 Reduced Yahtzee Game States Between turns: = Set of unscored primary categories: 2 13 How much needed for Upper Section Bonus: 64 = 2 6 (0.. 63) Will 5 equals get Extra Yahtzee Bonus: 2 (false, true; only when Yahtzee score box used) Within turns: = 1681 Yahtzee 18
22 Reduced Yahtzee Game States Roll index: 3 (1.. 3) Roll versus Choose: 2 Rolled dice: Kept dice: ( ) = 252 ( ) = 462 Yahtzee 18
23 Dynamic programming Computational Approach Store optimal-expected-additional-scores to avoid recomputation Two-level Store optimal-expected-additional-score between turns only: Table of reals of 8 byte = 6 MB Recompute within turns Self-initializing Compute required states only: Yahtzee 19
24 And now what? Characterize optimal strategies Exact results versus simulation Compare to other strategies E.g. random play Investigate effect of rule changes E.g. 2 or 4 rolls per turn, no Jokers,... Yahtzee 20
25 What s in it for you? Optimal Solitaire Yahtzee Player Submit your game state on WWW and get advice Yahtzee Proficiency Test Play game on WWW and get analysis Also available as stand-alone PC program Yahtzee 21
26 Approximate Results Numeric Evaluation: Evalute exact recipe with finite precision Issues: numeric stability (rounding, cancellation) how many bits precision Simulation: Take average over a number of instances Issues: quality of random number generator how many instances (variance) Yahtzee 22
27 Dilemmas Resolved First turn, first roll: Keep 6 6 6: ± 61 Keep all and score 25 in Full House: ± 57 First turn, second roll: Keep 3 4: ± 57 Keep 1 1: ± 57 Keep 4: ± 57 Keep 3: ± 57 Keep none: ± 57 Keep 6: ± 57 Yahtzee 23
28 Dilemmas Resolved First turn, third roll: Score 24 in Sixes: ± 53 Score 25 in Four of a Kind: ± 54 Yahtzee 23
29 Optimal Strategy Trivia Expected final score: ± 60 Median final score: 248 Best roll in first turn: yyyyy Score 50 in Yahtzee: ± 83 Worst first roll in first turn: Keep 6: ± 58 Yahtzee 24
30 Optimal Strategy Trivia Worst third roll in first turn: Score 19 in Chance: ± 57 Minimum score: 12 Yahtzee 24
31 Final Scores per Category for Optimal Strategy Category E SD % 0 Aces Twos Threes Fours Fives Sixes U. S. Bonus Three of a Kind Four of a Kind Full House Small Straight Large Straight Yahtzee Chance Extra Y. Bonus GRAND TOTAL Yahtzees Rolled Jokers Applied Yahtzee 25
32 Final Scores, playing w/o Extra Yahtzee Bonus and Jokers Category E SD % 0 Aces Twos Threes Fours Fives Sixes U. S. Bonus Three of a Kind Four of a Kind Full House Small Straight Large Straight Yahtzee Chance GRAND TOTAL Yahtzees Rolled Jokers Applied Yahtzee 26
33 Distribution of Final Score for Optimal Strategy Score range % Cum.% % 0% % 0% % 2% % 5% % 14% % 27 % % 41 % % 60 % % 80 % % 86% % 90% % 92% % 93% % 94% % 96% % 98% % 99% % 99% % 99% Yahtzee 27
34 Distribution, playing w/o Extra Yahtzee Bonus and Jokers Score range % Cum.% % 0% % 0% % 2% % 5% % 14% % 27 % % 40 % % 61 % % 82 % % 90% % 97% % 100 % % 100 % Results based on simulation of 10 5 games Yahtzee 28
35 Cumulative Distribution of Optimal Final Score Final score % Games f scoring <f 152 1% 180 5% % % % % % % % Results based on simulation of 10 6 games Yahtzee 29
36 Cumulative Distribution of Final Score Without Extra Yahtzee Bonus and Jokers Final score % Games f scoring <f 152 1% 180 5% % % % % % % % Results based on simulation of 10 6 games Yahtzee 30
37 Earliest Scoring per Category for Optimal Strategy Earliest turn scoring Category Non-Zero Zero Aces 1 2 Twos 1 3 Threes 1 4 Fours 1 5 Fives 1 6 Sixes 1 9 Three of a Kind 1 7 Four of a Kind 2 2 Full House 1 5 Small Straight 1 10 Large Straight 1 7 Yahtzee 1 3 Chance 1 never Yahtzee 31
38 Last Turn Values per Category (w/o Extra Yahtzee Bonus) Category E SD % 0 Aces Twos Threes Fours Fives Sixes Three of a Kind Four of a Kind Full House Small Straight Large Straight Yahtzee Chance Yahtzee 32
39 Game with Minimum Score of Optimal Strategy Turn Third Roll Score in Category Aces Twos Four of a Kind Yahtzee Threes Fours Fives Full House Sixes Large Straight Chance Three of a Kind Small Straight 12 GRAND TOTAL Yahtzee 33
40 Game of Optimal Strategy against Demonic Dice Turn Roll/Keep Score in Category Aces Three of a Kind Four of a Kind Twos Yahtzee Threes Fours Yahtzee 34
41 Game against Demonic Dice (cont d) Turn Roll/Keep Score in Category Fives Full House Sixes Large Straight Chance Small Straight 19 GRAND TOTAL Yahtzee 35
42 Remaining Challenges Best strategy to beat given High Score Approximation via normal distribution and computed mean & variance Optimal premature stopping Best strategy for Group Yahtzee Approximation Yahtzee 36
43 References Our website since 1999: joint work with Erik Scheffers Hans van Maanen. Ook Yahtzee bezwijkt, Het Parool, 9-Oct Felix Holderied. German website since 1999 Olaf Vancura. Advantage Yahtzee. Huntington Press, 2001 Phil Woodward. Yahtzee: The Solution, Chance 16(1):17-20 (Winter 2003) Yahtzee 37
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