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Why did my opponent just get 3 whites in a row?

I was creating a game and choosing a random side. The same person (Goitia11) joined the games three times and was given white every time. If the person you just played plays you again one would think there should be an automatic swap between colors.
Same reason that it's quite possible to get heads (or tails) 3 (or more) times in a row in a flip coin toss.

I'm supposing you played three separate random-side games. Only rematches automatically switch the starting colors. Otherwise, it couldn't be considered "random" anymore.
That seems more like a bug than a feature. If two people immediately play two games in a row against each other at the same time control then the colors should obviously switch. Otherwise it enables the player who has white to 'angle shoot' the system by instead rematching by grabbing another seek in lieu of rematching, which now gives him a 50% chance of getting two whites in a row instead of 0%.
You are wrong.

If you challenge someone to a game with random colours, you will get random colours. If you challenge someone to a game that is not random colours (this includes hitting the rematch button), then you will not get random colours. I don't know how it could possibly be more straightforward, and it definitely isn't a bug.

http://dictionary.reference.com/browse/random?s=t
It's a design bug, not an implementation bug.

I had noticed I had a number of opponents who would rematch after playing black, but not after playing white, although I had never paid much of any attention to it. It turns out they are exploiting this bug to get an unfair ratio of whites in their games.

It's not a huge deal but obviously undesired behavior caused by this design.
Yes, I also noticed some people, who will rematch after playing black, but if they play white they will rather not accept rematch, but will join my game when I create it again, to increase chances to get white.
This seems unfair, and I agree with you.
In the same time creating a random color game means creating a random color game.
But this opens a way for color-hunters to play white more times then 50%. And those who don't care about a color, will be in worse positions, as those who artificially get to play black more than a half of times.
So I see your point. And I think this possibility of automatic swap of colors when someone you just played joins you again should be considered. May be there can be a time interval: 15 seconds. If a person you've played just joins you immediately, than it's like rematch.
Because there is no way to do legally toward such color-hunters.
Example:
you create a game, someone joins you, you play as white. Then you press rematch, you play black now and he plays white. After this game he don't accept rematch anymore, but is waiting for you who's creating a new game and join you.
If in this time he will get black, he will play this game (to avoid ban by aborting games), then will accept your rematch. But then he will quit again to join your game from the list (graphic) window.
If he gets white, he plays this game, but again do not accept rematch as black. And again he goes to the main site's page and joins you.
So it's obviously an artificial color substitution, that is obviously unfair.
And if you will cancel games with this person you can get ban for aborting games. If you will count every time, how much white and black you played it's also impossible to do with everybody.
I think that automatic replacement of colors, if somebody joins you immediately is a good idea. To avoid color-hunters.
In the first place, I would not have designed/implemented match-making the same way lichess (and most other online games) do, but that's neither here nor there. In fairness, I only thought of this after they already made such systems and I experienced their limitations myself. (My schema would probably have it's own unique set of issues.)

Would be nice if there was a (new) feature that lets you (toggle) override the randomness of succeeding games--only the first game between two players would have random sides and the next games become side switching flip-flops. Of course, there should be an indicator if a game initiator has this option on so that a "color hunter" has the freedom to avoid playing that.

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