I'm surprised I haven't seen much discussion about this here. Maybe the disconnecting glitches are more important, but that's not an issue I've come across. What I have found, though, is this:

Let's say I'm in a pot with another player. I have K-Q, both diamonds. He has K-10, both spades. In the community are: K clubs, 3 clubs, A clubs, 2 hearts, 6 hearts.

In regular poker, in my experience, this would be a split pot. We each have a pair of Kings with an Ace kicker. However, in Texas Hold'em Arcade, I would win the pot outright, because the game ignores the community and takes the kicker from our hands instead - or perhaps, sees my hand as A-K-K-Q-6 and him as A-K-K-10-6 and gives it to me because I have a higher average.

Is this intended behaviour? Is this just a different ruleset than I'm used to playing with?

In Texas Holdem it is the best 5 card hand that wins from the 7 cards available, so your supposition that the A-K-K-Q-6 combination is winning is correct.

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'trueachievements.com' - track your true gamerscore.

But it isn't. Those two hands are, in poker terms, exactly the same - a pair of Kings with an Ace kicker. The other two cards are irrelevant.

Your assumption that there is only one kicker is incorrect. In Texas Holdem there are multiple kickers and all count towards determining the winning hand.

Have a look at the rules for kickers and ties on wikipedia, it explains it in detail:

http://en.wikipedia.org/wiki/Texas_hold_'em#Kickers_and_ties

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'trueachievements.com' - track your true gamerscore.

Ah. I've just done a little more reading on it, and it seems I've been interpreting it wrong.

Ah well. Thanks.