Last Updated: November 9, 2014

Space Jack

Introduction

Space Jack is a blackjack variant available at the Slotland and Win a Day Internet casinos. I've seen a lot of strange blackjack variants in my 17 years writing about gambling, and Space Jack has got to be the strangest.

It should also be emphasized that the jackpot is temptingly big compared to the natural odds of hitting it. This is the case because the jackpot is not triggered by the natural draw of the cards but artificially, behind the scenes.

Rules

The rules are badly stated on the web site, so here is what you need to know.

1. Four decks of cards are used.
2. The player places three bets of equal size, from \$1 to \$20.
3. The player is dealt three two-card hands, and the dealer has an up card exposed.
4. Player blackjacks pay 2 to 1 and beat a dealer blackjack.
5. The European "no peek" rule is followed. This means that if the player doubles, and the dealer gets a blackjack, then the player will lose both the original and doubled portion of his bets.
6. Initially, the player may stand, hit or double. The one decision shall apply to all three hands!
7. Blackjacks do not pay immediately. If you choose to hit or double, then it will ruin any blackjacks.
8. The player may continue to hit as much as he wishes, until he chooses to stand or all three hands bust.
9. The player may double only after the initial deal.
10. If the player bets at least \$5 on each blackjack hand, for a total bet of \$15, and he gets three blackjacks, then he will win a progressive jackpot.
11. At the time of this writing (Nov. 9, 2014), the jackpot was at \$53,383.
12. Per the casino's own rules, the jackpot is not triggered by the cards but an internal mechanism. Here is a screenshot of how they explain it:

Strategy

Unfortunately, there is no easy way to quantify strategy for this game that I'm aware of. The good news is that most of the time the right play is pretty obvious. For those cases that aren't, you can find the best play by adding the expected value of all options for each hand. The following three tables show the expected value of each player hand by dealer up card for standing, hitting and doubling respectively.

Expected Values for Standing Expand

 Hard 2 3 4 5 6 7 8 9 10 Ace 4 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 5 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 6 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 7 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 8 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 9 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 10 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 11 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 12 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 13 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 14 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 15 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 16 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 17 -0.1533 -0.1173 -0.0778 -0.0413 0.0114 -0.1069 -0.3837 -0.4212 -0.4631 -0.6390 18 0.1207 0.1475 0.1768 0.2029 0.2833 0.4002 0.1052 -0.1835 -0.2396 -0.3782 19 0.3851 0.4033 0.4221 0.4429 0.4959 0.6166 0.5939 0.2857 -0.0159 -0.1168 20 0.6392 0.6493 0.6598 0.6723 0.7039 0.7737 0.7918 0.7579 0.436 0.1447 21 0.8816 0.8851 0.8881 0.8921 0.9027 0.9262 0.9305 0.9391 0.8108 0.3291 BJ 2 2 2 2 2 2 2 2 2 2.0000 12 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 13 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 14 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 15 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 16 -0.293 -0.2516 -0.2084 -0.1632 -0.1543 -0.4761 -0.5126 -0.5415 -0.5751 -0.7691 17 -0.1533 -0.1173 -0.0778 -0.0413 0.0114 -0.1069 -0.3837 -0.4212 -0.4631 -0.6390 18 0.1207 0.1475 0.1768 0.2029 0.2833 0.4002 0.1052 -0.1835 -0.2396 -0.3782 19 0.3851 0.4033 0.4221 0.4429 0.4959 0.6166 0.5939 0.2857 -0.0159 -0.1168 20 0.6392 0.6493 0.6598 0.6723 0.7039 0.7737 0.7918 0.7579 0.436 0.1447 21 0.8816 0.8851 0.8881 0.8921 0.9027 0.9262 0.9305 0.9391 0.8108 0.3291

Expected Values for Hitting Expand

 Hard 2 3 4 5 6 7 8 9 10 Ace 4 -0.1153 -0.0824 -0.0474 -0.0087 0.0106 -0.0881 -0.1596 -0.2408 -0.3431 -0.4362 5 -0.1286 -0.0951 -0.0594 -0.0203 -0.0017 -0.1192 -0.1884 -0.2667 -0.3655 -0.4362 6 -0.1411 -0.107 -0.0708 -0.0312 -0.0135 -0.1517 -0.2175 -0.2927 -0.388 -0.4362 7 -0.1096 -0.0765 -0.0409 -0.0037 0.0288 -0.0687 -0.2113 -0.2849 -0.3705 -0.4362 8 -0.0224 0.0078 0.0404 0.0744 0.1146 0.0826 -0.0604 -0.2104 -0.3059 -0.4362 9 0.0738 0.101 0.1299 0.1615 0.1957 0.1722 0.0981 -0.0527 -0.2167 -0.4362 10 0.1819 0.2058 0.2313 0.2592 0.2875 0.2572 0.1977 0.1163 -0.0526 -0.4362 11 0.2379 0.2602 0.284 0.3099 0.3334 0.2924 0.2297 0.1581 0.0339 -0.2097 12 -0.2537 -0.2337 -0.2127 -0.1911 -0.1708 -0.2127 -0.2718 -0.3401 -0.428 -0.5510 13 -0.3081 -0.2913 -0.2735 -0.2554 -0.2358 -0.2689 -0.3238 -0.3872 -0.4689 -0.5831 14 -0.3625 -0.3489 -0.3344 -0.3198 -0.3009 -0.3211 -0.3721 -0.431 -0.5068 -0.6128 15 -0.4169 -0.4064 -0.3953 -0.3842 -0.3659 -0.3696 -0.417 -0.4717 -0.542 -0.6405 16 -0.4713 -0.464 -0.4562 -0.4485 -0.431 -0.4146 -0.4586 -0.5094 -0.5748 -0.6662 17 -0.5364 -0.5319 -0.5272 -0.5223 -0.5088 -0.4833 -0.506 -0.5539 -0.6161 -0.6939 18 -0.6226 -0.6202 -0.6177 -0.6148 -0.6075 -0.591 -0.5911 -0.6167 -0.6745 -0.7418 19 -0.7292 -0.7281 -0.7271 -0.7258 -0.7226 -0.7154 -0.7137 -0.7156 -0.7502 -0.8097 20 -0.8553 -0.855 -0.8548 -0.8545 -0.8536 -0.8518 -0.8515 -0.8508 -0.8607 -0.8978 21 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1.0000 Soft 2 3 4 5 6 7 8 9 10 Ace 12 0.0813 0.1033 0.1279 0.1597 0.1856 0.1658 0.0949 -0.0002 -0.1407 -0.3228 13 0.0461 0.0741 0.1038 0.1366 0.1613 0.1227 0.0538 -0.038 -0.1729 -0.3482 14 0.0219 0.0508 0.0815 0.1152 0.1388 0.0798 0.013 -0.0754 -0.2049 -0.3735 15 -0.0006 0.0292 0.0608 0.0953 0.1178 0.0373 -0.0273 -0.1124 -0.2365 -0.3985 16 -0.0215 0.0092 0.0416 0.0769 0.0984 -0.0046 -0.067 -0.1489 -0.2677 -0.4231 17 -0.001 0.0289 0.061 0.0945 0.1277 0.054 -0.0736 -0.1494 -0.2577 -0.4327 18 0.0623 0.09 0.1198 0.1509 0.1904 0.171 0.0392 -0.1009 -0.2085 -0.3729 19 0.1233 0.149 0.1764 0.2063 0.2395 0.221 0.152 0.0073 -0.1569 -0.3126 20 0.1819 0.2058 0.2313 0.2592 0.2875 0.2572 0.1977 0.1163 -0.0526 -0.2523 21 0.2379 0.2602 0.284 0.3099 0.3334 0.2924 0.2297 0.1581 0.0339 -0.2097

Expected Values for DoublingExpand

 Hard 2 3 4 5 6 7 8 9 10 Ace 4 -0.586 -0.5032 -0.4168 -0.3264 -0.3086 -0.9523 -1.0252 -1.083 -1.1501 -1.5381 5 -0.586 -0.5032 -0.4168 -0.3264 -0.3086 -0.9523 -1.0252 -1.083 -1.1501 -1.5381 6 -0.5645 -0.4826 -0.3967 -0.3076 -0.2831 -0.8955 -1.0054 -1.0645 -1.1329 -1.5181 7 -0.4364 -0.3592 -0.2772 -0.1951 -0.1393 -0.5902 -0.8508 -0.9539 -1.0296 -1.3980 8 -0.2056 -0.1362 -0.0627 0.0109 0.0862 -0.1881 -0.455 -0.717 -0.8404 -1.1772 9 0.0599 0.1205 0.1841 0.2502 0.3164 0.1041 -0.0287 -0.3005 -0.5817 -0.9160 10 0.3578 0.4089 0.4625 0.5184 0.575 0.3923 0.2847 0.1452 -0.1599 -0.6264 11 0.4697 0.5177 0.5679 0.6199 0.6667 0.4627 0.3487 0.2289 0.0131 -0.5412 12 -0.5075 -0.4675 -0.4253 -0.3821 -0.3415 -0.5069 -0.6173 -0.7366 -0.888 -1.1902 13 -0.6163 -0.5826 -0.5471 -0.5109 -0.4717 -0.5875 -0.6923 -0.8072 -0.9534 -1.2257 14 -0.725 -0.6977 -0.6689 -0.6396 -0.6018 -0.6681 -0.7673 -0.8777 -1.0188 -1.2613 15 -0.8338 -0.8129 -0.7907 -0.7684 -0.7319 -0.7487 -0.8423 -0.9482 -1.0841 -1.2968 16 -0.9426 -0.928 -0.9125 -0.8971 -0.862 -0.8293 -0.9173 -1.0188 -1.1495 -1.3323 17 -1.0728 -1.0638 -1.0543 -1.0446 -1.0176 -0.9667 -1.0121 -1.1078 -1.2321 -1.3879 18 -1.2453 -1.2404 -1.2354 -1.2296 -1.215 -1.1821 -1.1821 -1.2334 -1.3491 -1.4835 19 -1.4583 -1.4562 -1.4542 -1.4516 -1.4451 -1.4308 -1.4273 -1.4312 -1.5005 -1.6194 20 -1.7105 -1.71 -1.7095 -1.7089 -1.7073 -1.7037 -1.703 -1.7017 -1.7214 -1.7955 21 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2.0000 Soft 2 3 4 5 6 7 8 9 10 Ace 12 -0.0724 -0.0069 0.0618 0.1328 0.1789 -0.1845 -0.3174 -0.4545 -0.6265 -1.0481 13 -0.0724 -0.0069 0.0618 0.1328 0.1789 -0.1845 -0.3174 -0.4545 -0.6265 -1.0481 14 -0.0724 -0.0069 0.0618 0.1328 0.1789 -0.1845 -0.3174 -0.4545 -0.6265 -1.0481 15 -0.0724 -0.0069 0.0618 0.1328 0.1789 -0.1845 -0.3174 -0.4545 -0.6265 -1.0481 16 -0.0724 -0.0069 0.0618 0.1328 0.1789 -0.1845 -0.3174 -0.4545 -0.6265 -1.0481 17 -0.008 0.0551 0.1221 0.1891 0.2554 -0.0141 -0.2579 -0.399 -0.5749 -0.9881 18 0.1185 0.1773 0.2396 0.3018 0.3808 0.22 -0.0322 -0.2893 -0.4717 -0.8677 19 0.2406 0.2953 0.3528 0.4126 0.479 0.3198 0.1933 -0.0727 -0.3685 -0.7470 20 0.3578 0.4089 0.4625 0.5184 0.575 0.3923 0.2847 0.1452 -0.1599 -0.6264 21 0.4697 0.5177 0.5679 0.6199 0.6667 0.4627 0.3487 0.2289 0.0131 -0.5412

Example

Let's look at the hand pictured on the right as an example. Doubling is clearly an awful decision, so we can narrow down the viable options to hitting and standing. Basic strategy says to hit 12 against 2 and stand 19 against 2. While hitting is right on two out of three hands, it is only marginally right on the two 12s. Meanwhile, standing is by far the right play for the 19. However, enough talk, let's do the math and calculate the expected value (EV) for hitting and standing:

EV of standing = 2×-0.2930 + 0.3851 = -0.2003
EV of hitting = 2×-0.2537 - 0.7292 = -1.2366

So, you can expect to lose -0.2003 hands by standing and -1.2366 by hitting. It isn't even close; standing is the better play.

Action Frequencies

Here is how often each action is taken on the initial two card hands:

• Stand: 64.15%
• Hit: 34.11%
• Double: 1.73%
• Jackpot (assuming fair game): 0.0089%.

Analysis

Before considering the jackpot, the house advantage in Space Jack is 6.61% of all initial wagers. For example, if the player makes three bets of \$10, then he can expected to lose \$10 × 3 × 6.61% = \$1.98.

If the cards were dealt fairly for jackpot purposes, then the probability of winning the jackpot with three blackjacks would be 1 in 11,206. Based on a \$15 total bet, the value for each \$10,000 in the jackpot would be 5.95%. The meter would need to be only \$11,117 to reach breakeven. At the minimum jackpot of \$50,000 and \$15 bet, the player advantage would be 23.13%. At a \$100,000 jackpot, it would be 52.88%.

However, all that is moot because they admit the jackpot is not determined by the random draw of the cards but rather generated randomly, behind the scenes. Nowhere is it disclosed what this probability is.

Given that the odds of the jackpot are not quantifiable, I would ignore that element to the game and assume a house edge of 6.61%, which is quite high for a table game. Keep in mind the house edge in conventional blackjack is about 0.5%, depending on the specific rules. Draw your own conclusion.

Blacklist

I am big on open and honest gambling. Part of that means electronic representations of physical gambling equipment like cards, dice and balls conform to natural probabilities, as if played in real life. By their own admission, Slotland does not trigger the jackpot in card games by the cards themselves. For this reason, Slotland is on my online casino blacklist.

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