As far as slots are concerned:
The hot or cold coin theory is bullshit. There is a mathematical algorithm that takes place inside the spinner, via a computer. When you pull the lever, the computer calculates it's numbers before the spinners even start. Yes, the outcome is determined before the spinners stop. It is all based on luck.
BUT;
The theory about where the slots are located is true. Closer to the doors is usually a little of a longshot, but sometimes is true. Expect to lose a little bit of money first, and then hit. You'll have a better chance at machines right next to the tables. These will hit more often to attract table-lurkers to come put money in the adjacent machine, which is usually extremly tight (adjacent meaning the machine right next to the one that hits, the second down the row.)
Also, whenever the high-coin jackpot has a first and second that are close in #'s.
For instance:
3rd coin three 7's jackpot is 2000
3rd coin second jackpot of three bars (for instance) is 800
^This machine will be tight
When the jckpot is closer, though:
3rd coin jackpot 2000
3rd coin second jackpot (three bars) is 1800
^this machine has a better chance.
Also, when a casino says that a circle, or square of machines is "progressive" they are usually referring to only two or three machines that ACTUALLY HAVE THE SIGN stating "progressive" RIGHT above them. Do not assume all of the machines where the sign says "progressive" will be considered "progressive" by the casino.
Just my
