Why the third repetition moves not functions in Chess.com?

Why the third repetition moves not functions in Chess.com?

It works perfectly but you have to claim the draw (as per the rules of chess), the draw will not be awarded automatically without a valid claim.

Thanks Chess_boy and Thanks PawnEatsPawn!

That didn't work for me today.

While 2 players play 3 repetition moves, that means they are agreed on draw. So, it should be an automatic.

No.

Even in FIDE tournament play, you (or your opponent) must CLAIM the draw by threefold repetition. It does not happen automatically.

As a FIDE rule, one must announce Check. How I will utter check for my opponent here in chess.com? So, in FIDE chess board and clocks, arbiter, all are manual. But in chess.com board, clock, Queening, winnning, all are automatic. So, why not 3 repetition automatic draw?

You are comparing apples and oranges.

It's because claiming a draw by three-fold repetition is discretionary... you can repeat the position three times and still decide NOT to claim the draw, and keep on playing instead.

But if you move your Queen up adjacent to the enemy King, you CANNOT decide not to put him in check.

If that is true then playing under FIDE rules must be annoying.

Huh? Who told you that?

Actually, saying check could be considered a rule violation. You are only supposed to communicate with your opponent by resigning or draw offers.

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Ubik42 beat me to it.

I always thought saying check was just a friendly gesture just in case it wasnt noticed!!1

In casual games, it is exactly that.

Is this a new rule? I do not see it anywhere and am wondering if I am just reading old material?

Announcing check and notation

In friendly games, the checking player customarily says "check" when making a checking move. Announcing "check" is not required under the rules of chess and it is usually not done in formal games. Until the early 20th century a player was expected to announce "check", and some sources of rules even required it (Hooper & Whyld 1992:74).

http://en.wikipedia.org/wiki/Check_%28chess%29

ummm ... that's not a FIDE rule. That's a WIKI rule.

That also says that "check" is not required. 

You stated that "as a FIDE rule, one MUST announce Check" (emphasis mine).

I want to make sure I am following the rules when I play. Can you point out the new FIDE rule that says you "must" anounce check? I realize now that my FIDE rules must be old and you have a new source. You might, as a courtesy, put in an update to Wikipedia also.

I've checked the FIDE web-site. There is no such rule.