end game rules

Matalino, delik venat just misunderstood some rules.

In some sites, if you repeat exactly the same move twice,or three times(really can't remember) it is simultaneously a draw.

But of course,someone can't loose only by checking his opponent,even if he is using the same moves...

Oxford Companion To Chess -1996.

Don't know if anything's changed...

If both players have made moves without capturing a man or moving a pawn, a player whose turn it is to move may claim a draw except for SIX BASIC ENDGAMES, for which the number of moves is extended to 75:

Q v. B+B

Qv. N+N

B+B v.N

N+N v.P

Q+P 1 square away from promotion v. Q

R+B v>R

This law was enacted by FIDE in 1988 and superceded a mercifully short 100 move law.

The first three rarely occur in play. The last 3 occur more often, but the great majority are either drawn, or can be won in fewer than 50 moves. R+B v. R occurs most frequently, and wins in more than 50 moves are few, while many positions are drawn at the start. Not surprisingly, many players object to a 75 move defensive task.

Generally, the occurrence of a long win is so improbable that some masters, among them Kasparov, suggest that the old fifty move rule would suffice for all endgames.

This position was analysed by the American computer expert in 1988. Against the best defense White needs 77 moves to win the Black Knight, but is allowed only 50.

the game=

drawn (after the repitition + 50 moves without taking a pawn or another piece)

the stalemate ...

Evidently you can also read everything I post below in the rules section of this site (or any other chess site, for that matter). Still it might help clarifying a few points made earlier in this thread.

You win a game, if

a) you deliver checkmate,

b) your opponent resigns, or,

c) oversteps the time limit.

A game is drawn

a) by mutual agreement

b) by stalemate

c) if 50 moves have been made without a capture or a pawn move

d) if a position is repeated three times with the same side to move!

e) if  material is insufficient to checkmate (bare kings, K+N vs. K, K+B vs. K)

There are no exceptions from these rules in the endgame or anywhere else although it has been proven there are endgames which are indeed winnable in more than 50 moves.

oK

If I recall correctly, the threefold repetition rule doesn't state that the moves have to be consecutive. Thus if the same situation arises three times at any point in the game, a draw results. But of course after a pawn moving the situation isn't the same anymore.

Maybe this is a little off topic, but if you see on this site: http://www.xs4all.nl/~timkr/records/records.htm it says that the greatest number of castlings in one game i 3!!.

Is it really possible to have a game with 3 castlings? Or i can ask...Can one player castle 2 times? Or have i just totally misunderstood what this "record" is all about?

The moves don't have to be consecutive, the important thing is that the position has to appear three times, no matter how many moves have been played in between, and in all cases it has to be the same side's move.

The actual procedure of claiming the draw in otb play can be tricky, my team once lost a match because of that. If you have the possibility to create an identical position for the third time, you must not bash out the move but inform the TD (or the team captains) beforehand that you intend to play that move and that you claim a draw on that basis - otherwise the game will be continued as normal, provided your opponent finds another move in order not to repeat the position yet again. In online chess this problem usually doesn't arise, as the server usually just sets the game resiult to draw after a threefold repetition.

Hehe, this is a nice one!

To answer your question: No player can castle twice, and the second castling of White in the game cited in your link was in fact illegal. However, if a player makes an illegal move but his opponent doesn't notice and claim so, the game is continued as normal, and no post mortem revocation of the illegal move is possible - yet another one of my unpleasant memories from team chess...

Again, this can obviously only happen in otb chess, as your online client will not let you execute an illegal move.

50 moves then it is draw

It doesn't come up  much in practical play but the three-fold repetition of position must take into account of the dynamic possibilities of the postions being compared. The position of the pieces may be exactly the same but if castling is possible in one position but not the other, then they are not the same position (a rook or king has moved in the meantime). Ditto for en passant captures being possible in one position and not another.

Actually, that's not quite right... just so it's clear, on chess.com, threefold repetition MUST be claimed, it's not automatic. To do so, once the board is in the repeated position, click the "Offer Draw" button. If you do this, and the position has indeed been repeated three (or more) times, the game will end immediately.

Wow. I would've said 50 flat, I start counting when its king vs king and other pieces. So it restarts when a pawn moves heh? That will make those king vs king and pawn endgames a little easier.

Well, I learned something today. 

BlackOps... when you say sufficient/insufficient material do you mean pieces?

He means that if neither side has enough material to force a checkmate then the game is a draw no matter what else happens.

Sufficient material to mate covers a wide area. You need at least a bishop and knight against a king but that's a difficult mate. Two bishops can mate. Two knights can mate only if the opponent makes some serious mistakes, they can't force a mate. Several pawns can mate if the enemy king gets himself boxed in, but one of the pawns would probably queen anyway. Of course, a rook and king or a queen and king should have no trouble mating a lone king.

I thought it was 30.

The term material is normal chess terminology. It is used rather than the term pieces to signify the dirreference in strength, a rook is one piece just like a queen, but a queen is more material than a rook as it is a stronger piece. The actual number of pieces is not interesting when evaluating a position, it is the combined strength of the pieces that is interesting. Thus unless talking about specific pieces, material is almost always the preferred term.

thanks for clarifying