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Constructed case: In a tournament (LoC Tournament Rules apply, no rapid, no blitz) White plays d7-d8Q by placing the new Queen on d8 with the right hand and removing the pawn d7 with the left. … Relevant rules: 4.1 Each move must be played with one hand only. 5.1.1 The game is won by the player who has checkmated his opponent’s king. …

The official FIDE laws of chess do not know about a queen check. Announcing a "queen check“ might even be considered a case of "to distract or annoy the opponent“ (11.5). Even announcing a "king chec …

When playing online at some minor platform, you will often find that the rules of chess are badly implemented. I know of no single platform that plays strictly FIDE rules. …

I don’t think that it is possible to answer the question objectively. For ME, the main non-functional characteristic is the user interface. I prefer DGT-style UI, and i try to avoid Silver-style UIs. …

You have found out all relevant rules, which are the Laws of Chess, including Guideline II. As expected, the wording of the rules seems not to cover that case. … Even if the rules would contain a loophole, it is obvious that it is intended that a player may not exhibit his king to an attack. …

When FIDE tournament rules apply: If you displace one or more pieces – knocking off the board, intentionally or unintentionally, is a displacement – you have to re-establish the correct position on your … USCF might have additional rules. …

As you flagged your question with „rules“, i will try an answer. I do not think that a FSM is an appropriate model. Of course, you have a big but finite number of states. … Those contain mainly two parts: The Basic Rules of Play (Art. 1 – 5) and Competition Rules (Art. 6 – 12, Appendices, and Guidelines). …

As always: It depends ;-) FIDE tells us that it is not allowed to write moves in advance, so the arbiter HAS to give a penalty. He may choose from those in Art. 12.9 considering the circumstances. N …

You have to consider all circumstances, look at all rules, and make a decision. …

Karpov was lucky that the Tournament Rules reduced time penalty to 3 min. Today’s decision would be: The opponent would be rewarded a 2 min time bonus. …

FIDE rules commission has an archive, but my browser shows me only a blank page for the 2014 LoC. Can someone provide a readable link to the archive? …

In short: Art. 5 lists situations that end the game immediately. Checkmate, stalemate, resignation, draw by agreement, dead position. Those end the game even if it is not noticed. All other ends need …

But those rules are not known to everyone playing „chess“ in private. The official rules allow every move or capture to get out of chess (except castling, of course). … Private rules might differ, but those are not official, and one could discuss if the game described by those private rules is still chess. …