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Is there a rule on how accurately pieces have to be positioned within a square? Can they touch the border for instance?

In the following example (and similar situations you can make up), both queens can capture the knight. If for instance the queen on f5 takes the knight, this could be written as: Qfxd3 or as Q5xd3. Is …

Thus not having en-passant would change the evaluation of many endgames and complicate rules somewhat because now you'd have to consider on what row the pawns are as well. …

write down the moves in standard chess games: as a document, proof of the game and result (in some cases but not always the players also have to sign) in order to confirm 50-move and 3-fold repetition rules …

In connection with the Hou Yifan incident in Gibraltar I read that when doing the pairings they avoided matches between players from Iran and Israel (for whatever reason...). How is this technically …

Now if all of these rules/parameters have been set, is there still any ambiguity left? … Basically what I am asking is, whether in practice the rules are stated and followed completely (meaning that all kinds of exceptions need to be stated) or whether pairing rules are only laid out roughly …

In this sense it is legal, but might still violate some general fair play rules. In any case you'd lose 15 minutes on the clock. Is it worth it? …

To some extent it is possible to program an engine that can take custom rules. …

Rules are explained here. …

I don't know about USCF rules, but according to FIDE Laws of Chess, article 9.1.b.1: A player wishing to offer a draw shall do so after having made a move on the chessboard and before pressing his …

Other than the catchall rule mentioned by D M, Article 11.1: The players shall take no action that will bring the game of chess into disrepute., I don't think there is a rule that prevents such scenar …

Alternatively this can be defined by two rules that have to be satisfied simultaneously: all escape squares of the king are taken; either blocked by pieces of the king's color or (as in your case) covered …

As mentioned by others, this move is perfectly legal (unless it puts your own king in check) and is called discovered check or more generally discovered attack (if the attacked piece is not the king) …

In the board position both knights can move to e4. To distinguish which knight moved one would normally write Nce4 or Nfe4. However in this special situation only Nce4 is check. Would it be sufficien …

What rules (if any) cover a situation like this? Also I've seen claims that Inarkiev has pulled this "trick" before. If true, when and where was that? …