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Probability

Last post 01-23-2008, 2:21 PM by Azuarc. 20 replies.
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  •  04-05-2007, 12:29 PM 698856

    Probability

    I came up with a probability sheet for how likely it is to draw a specific card given the number of cards drawn. This table assumes that the deck size is 60 and the deck contains 4 copies of the specific card. The table starts at 7 because your opening hand is 7.

    So for those who's wondering, the likelihood of a hunter playing a turn 1 Bloodclaw (given that he has 4 in his deck), is the sum of the first row (39.9%). This does not account for mulligan.

    The table doesn't illustrate this, but if you have 3 copies, then this probability decreases to 31.5%, for 2 it's 22.1%, and for 1 it's 11.7%.

    P(drawing N specific cards given total cards drawn)
    Cards Drawn 1 2 3 4
    7 0.336 0.059 0.004 0.000
    8 0.363 0.076 0.006 0.000
    9 0.384 0.094 0.009 0.000
    10 0.402 0.113 0.012 0.000
    11 0.416 0.133 0.017 0.001
    12 0.426 0.153 0.022 0.001
    13 0.432 0.173 0.028 0.001
    14 0.436 0.193 0.034 0.002
    15 0.436 0.213 0.042 0.003
    16 0.435 0.233 0.051 0.004
    17 0.430 0.252 0.060 0.005
    18 0.424 0.270 0.070 0.006
    19 0.415 0.288 0.081 0.008
    20 0.405 0.304 0.094 0.010
    21 0.394 0.319 0.106 0.012
    22 0.381 0.333 0.120 0.015
    23 0.366 0.346 0.134 0.018
    24 0.351 0.357 0.149 0.022
    25 0.336 0.366 0.165 0.026
    26 0.319 0.374 0.181 0.031
    27 0.302 0.380 0.198 0.036
    28 0.285 0.384 0.215 0.042
    29 0.267 0.387 0.232 0.049
    30 0.250 0.388 0.250 0.056
    31 0.232 0.387 0.267 0.065
    32 0.215 0.384 0.285 0.074
    33 0.198 0.380 0.302 0.084
    34 0.181 0.374 0.319 0.095
    35 0.165 0.366 0.336 0.107
    36 0.149 0.357 0.351 0.121
    37 0.134 0.346 0.366 0.135
    38 0.120 0.333 0.381 0.151
    39 0.106 0.319 0.394 0.169
    40 0.094 0.304 0.405 0.187
    41 0.081 0.288 0.415 0.208
    42 0.070 0.270 0.424 0.230
    43 0.060 0.252 0.430 0.253
    44 0.051 0.233 0.435 0.278
    45 0.042 0.213 0.436 0.306
    46 0.034 0.193 0.436 0.335
    47 0.028 0.173 0.432 0.366
    48 0.022 0.153 0.426 0.399
    49 0.017 0.133 0.416 0.434
    50 0.012 0.113 0.402 0.472
    51 0.009 0.094 0.384 0.512
    52 0.006 0.076 0.363 0.555
    53 0.004 0.059 0.336 0.601
    54 0.002 0.044 0.305 0.649
    55 0.001 0.030 0.269 0.699
    56 0.000 0.019 0.227 0.753
    57 0.000 0.010 0.180 0.810
    58 - 0.003 0.127 0.870
    59 - - 0.067 0.933
    60 - - - 1.000

    For you math freaks, I used the hypergeometric distribution as illustrated here. Let me know if there are other probabilties of interest and I'll try to impliment it. Or, if I've erred in this calculation, let me know.




    My entire collection for sale.
  •  04-05-2007, 12:46 PM 698875 in reply to 698856

    Re: Probability

    So I have about a 44% chance of getting my searing totem (assuming the rush deck opponent is going first).  That's not so bad.  If you assumed I got no searing totems then the probability would be about (1-.399)(.44) + (.44) = .70

    That's pretty damn good. 


    The hands of the King are the hands of a Healer

    Bay Area Organized Play Calendar
  •  04-05-2007, 12:52 PM 698880 in reply to 698875

    Re: Probability

    That's why shaman is king =)


    My entire collection for sale.
  •  04-06-2007, 6:02 AM 699550 in reply to 698880

    Re: Probability

    You really had nothing else to do that day didnt you? :P
    http://entertainment.upperdeck.com/WOW/COMMUNITY/forums/721706/ShowThread.aspx#721706 -- this is my HAVE WANTS LIST!
  •  04-06-2007, 7:11 AM 699640 in reply to 699550

    Re: Probability

    You forgot to mention how broken warriors are.

    *
  •  04-06-2007, 7:23 AM 699657 in reply to 699640

    Re: Probability

    Wasn't relevant to the topic ;-)
    http://entertainment.upperdeck.com/WOW/COMMUNITY/forums/721706/ShowThread.aspx#721706 -- this is my HAVE WANTS LIST!
  •  04-06-2007, 9:35 AM 699818 in reply to 698856

    Re: Probability

    In what way are warriors broken?
    -Vio
    Retired Tauren Warrior
    Have/Want List here
  •  04-07-2007, 4:24 AM 700770 in reply to 699818

    Re: Probability

    Its mainly Warrax Warriors, the others aren't so bad coz they go for aggression sacrificing turtling tactics.

    (1) Mass armour damage reduction with not enough cards to destroy Armour unless ur a Rogue
    (2) Stoneform if ur Warrax
    (3) Defensive Stance - negates all DOT's, mini allies and gives protector all for 3 mana
    (4) Demorilizing Shout

    Basically the turtle warrior can just sit there un damagable whilst it pings you each turn. Now assuming the opponent hasn't spent £150 on their deck obtaining all the epics, they're screwed.


    http://entertainment.upperdeck.com/WOW/COMMUNITY/forums/721706/ShowThread.aspx#721706 -- this is my HAVE WANTS LIST!
  •  01-20-2008, 8:21 AM 996319 in reply to 698856

    Re: Probability

    If you mulligan how does that effect the chance of getting a card you have 4 of on the first turn?
  •  01-20-2008, 10:13 AM 996449 in reply to 996319

    Re: Probability

    Damnit, Kyusuke, you beat me to it. I'd love to see your formula for the probabilities, I've got a different table in mind.

    To the above, mulliganing would affect it in the following way:

    Take the probability you would get the card in your first hand. Subtract it from 1. So in the case of having 4 copies, this would be 60%. This is the chance you would have to mulligan it. Multiply that by itself, again the chance you would not draw the card  in your second hand. .60*.60 = .36 This is the chance you will not draw the card in either of your opening hands. Again, subtract this from 1, and you get approximately a 64% chance that you will draw the card in one of your two opening hands.

    =========

    WoW Rules Knowledge Lvl 1
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  •  01-20-2008, 10:50 AM 996495 in reply to 996449

    Re: Probability

    God this thread brings back warm memories. Whatever happened to FarmerGiles?
    Level 1 Judge
  •  01-20-2008, 12:18 PM 996599 in reply to 996495

    Re: Probability

    Here's that other table I had in mind:

    This table represents the probability of having a card in your opening hand, given how many cards are in your deck and how many copies of that card are in your deck, for both Opening Hand and Mulliganned Hand.

    First Hand            60             61            62           63             64            65
                  4    39.95%    39.40%    38.86%    38.34%    37.83%    37.33%
                  3    31.54%    31.08%    30.63%    30.20%    29.77%    29.36%
                  2    22.15%    21.80%    21.47%    21.15%    20.83%    20.53%
                  1    11.67%    11.48%    11.29%    11.11%    10.94%    10.77%
                           
    After Mulligan       60            61            62            63             64            65
                  4    63.94%    63.27%    62.62%    61.98%    61.35%    60.73%
                  3    53.14%    52.50%    51.88%    51.27%    50.68%    50.10%
                  2    39.39%    38.85%    38.33%    37.82%    37.33%    36.84%
                  1    21.97%    21.63%    21.31%    20.99%    20.68%    20.38%

    Here's how to read this chart: Lets say you're playing Paladin, up against a Rush deck. You really want Avenger's Shield in your hand. Ideally, you have 4 of them, and your deck is only 60 cards. This gives you about a 40% chance that you'll have one at the start of the game. If you don't, you can mulligan which will give you a second 40% chance, bringing your total chance up to about 64%. So including Mulligan, with 4 copies of the card, you can expect to see an Avenger's Shield in your hand in just about 2 of every 3 games you play.

    Now lets say you're no longer up against a rush deck. Avenger's Shield becomes less useful, so you decide to pull a couple out. You now only have a 22% chance to draw it, which means you'll only see it in your opening hand in about 1 in 5 games. Not bad, since you might be able to draw it later when larger creatures are out and you can use it then.

    Statistics continue to change as you add more cards to the size of your deck. If you're running the same deck, but now with 65 cards, your opening hand chance drops slightly. Not an amazing amount, but enough to probably screw with your mechanics.


    =========

    WoW Rules Knowledge Lvl 1
    Player Management Lvl 1
    Tournament Organizer Lvl 1
  •  01-20-2008, 2:20 PM 996734 in reply to 996599

    Re: Probability

    1812975:
    Here's that other table I had in mind:

    This table represents the probability of having a card in your opening hand, given how many cards are in your deck and how many copies of that card are in your deck, for both Opening Hand and Mulliganned Hand.

    First Hand            60             61            62           63             64            65
                  4    39.95%    39.40%    38.86%    38.34%    37.83%    37.33%
                  3    31.54%    31.08%    30.63%    30.20%    29.77%    29.36%
                  2    22.15%    21.80%    21.47%    21.15%    20.83%    20.53%
                  1    11.67%    11.48%    11.29%    11.11%    10.94%    10.77%
                           
    After Mulligan       60            61            62            63             64            65
                  4    63.94%    63.27%    62.62%    61.98%    61.35%    60.73%
                  3    53.14%    52.50%    51.88%    51.27%    50.68%    50.10%
                  2    39.39%    38.85%    38.33%    37.82%    37.33%    36.84%
                  1    21.97%    21.63%    21.31%    20.99%    20.68%    20.38%

    Here's how to read this chart: Lets say you're playing Paladin, up against a Rush deck. You really want Avenger's Shield in your hand. Ideally, you have 4 of them, and your deck is only 60 cards. This gives you about a 40% chance that you'll have one at the start of the game. If you don't, you can mulligan which will give you a second 40% chance, bringing your total chance up to about 64%. So including Mulligan, with 4 copies of the card, you can expect to see an Avenger's Shield in your hand in just about 2 of every 3 games you play.

    Now lets say you're no longer up against a rush deck. Avenger's Shield becomes less useful, so you decide to pull a couple out. You now only have a 22% chance to draw it, which means you'll only see it in your opening hand in about 1 in 5 games. Not bad, since you might be able to draw it later when larger creatures are out and you can use it then.

    Statistics continue to change as you add more cards to the size of your deck. If you're running the same deck, but now with 65 cards, your opening hand chance drops slightly. Not an amazing amount, but enough to probably screw with your mechanics.



    Your "After Mulligan" table is misleading. If you first see a hand with no Avenger's Shield and decide to mulligan, you still only have a 39.95% chance of getting Avenger's Shield in your new hand.

    The two hands are independent, so the 63.94% is actually the probability of getting an Avenger's Shield in one hand, the other, or both. However, it's not like you can draw two sets of opening hands and then decided whether or not to keep the first or the second.
  •  01-20-2008, 2:41 PM 996766 in reply to 996734

    Re: Probability

    That is correct, I should have made it a little more clear. I attempted to explain it in the paragraph below the chart, but it may not have come across as clearly as I would have liked.

    To re-iterate: The After Mulligan chart is the probability that you will get at least one copy of the card in either of your two opening hands. Which means that you have, at best, a 64% chance of having the card you want in your hand at the beginning of a match unless it is an (Unlimited) card.

    I'm working on publishing a spreadsheet so you can easily see based on the number of a type of card you have in  your deck what the probability of drawing one is. For instance, a friend of mine will scoop if he doesn't get a weapon in either of his opening hands. How many weapons must he have in his deck to minimize the number of times he scoops?

    =========

    WoW Rules Knowledge Lvl 1
    Player Management Lvl 1
    Tournament Organizer Lvl 1
  •  01-21-2008, 2:02 PM 997924 in reply to 996766

    Re: Probability

    knowing the odds of drawing a certain card int his game is very important....here it is in order or importance the 5 top things u need to know to win at this game.

    1. know your deck well and every little trick in it.
    2. know your opponents deck and every little trick in it
    3. know how to read the back of your opponents cards...in other words try to figure out whats in his hand, and learn how to read his moves, play his turn for him b4 he does.
    4.learn to bluff noob.  talking up your opponent during a game and influencing his descisions through your words,bluffs, or fake actions are critical in confusing your opponent.
    5. know the odds of card x in his hand and card x is always the worst case scenario.  in other words, dont always play conservative but know the odds of what your doing when u play and minimize each moves risk.  in many games it all comes down to well if i do this this turn and he doesnt have that card in his hand, he loses, but if he does he wins, or i can do this, play 2 more turns and win then.  you have to know when to push all your chips on the table.


    hope this puts the odds table in perspective

    jewbacca

    2010 poty and world champion
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