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82 votes
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Is it sportsmanlike to waste opponents' time by giving check at the end of the game?

That only works in blitz time controls with no increment. If you accept games with no increment you are basically agreeing that flagging is part of the game and sportsmanlike. If you personally find ...
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49 votes

Must one say "queen check" before capturing a queen?

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 &...
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48 votes

Is it sportsmanlike to waste opponents' time by giving check at the end of the game?

In blitz, time is a major factor in the game, and it is fine to try and win on time. If you used too much time, and your opponent thinks he can flag you, there is nothing wrong with that. It is part ...
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  • 31.9k
40 votes

Is it sportsmanlike to waste opponents' time by giving check at the end of the game?

Time is a resource in blitz chess, as much as or even more so than material. If it isn't unsportsmanlike to capture your opponent's material, how is it unsportsmanlike to capture their time? In ...
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  • 2,441
39 votes

Can a player in check win, by checkmating the opponent, while not getting themselves out of check?

For this kind of question, if you have doubts, just play chess with the goal of capturing the enemy king. The first player to capture the enemy king wins. This isn't the official rule, but it's ...
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  • 21.7k
37 votes

Can a player in check win, by checkmating the opponent, while not getting themselves out of check?

According the FIDE LAWS of CHESS: 3.9.2 No piece can be moved that will either expose the king of the same colour to check or leave that king in check. So as @djnavas points out, if you are in check ...
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  • 483
36 votes
Accepted

When capturing en passant, is a position possible such that there is a pin over the square of the taken pawn, rather than the taking pawn?

Really interesting question. I think the following shows that such a situation is sort of possible, depending on how you define the pin. [StartFlipped "0"] [FEN "7k/4p3/8/2KP3r/8/8/8/8 ...
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31 votes
Accepted

When you check someone, do you have to say "check"?

In a tournament game, you are not supposed to speak at all other than to offer a draw or adjust a piece. This includes saying check. This tends to seep into casual games among more experienced players ...
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  • 7,388
31 votes

Must one say "queen check" before capturing a queen?

No. Some people think it is polite to say 'gardez' to alert a player that the Q can be taken. But no rule says you have to say check nor gardez and in serious games with good players it is not done. ...
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27 votes

Is it sportsmanlike to waste opponents' time by giving check at the end of the game?

waste their time If it's clear that they are able to win within the time they have left, this could be considered bad sportsmanship. However, in those situations the number of remaining checks is ...
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24 votes
Accepted

Moving into check for a draw as black, why is it illegal? Comparison to Racing Kings

Imagine a variation of chess without the rules about check and checkmate, where a player wins simply when he captures his opponent's king. In this variation, Kxd5 loses the game to exd5. Turns out, ...
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22 votes
Accepted

Is it true that at any time only one piece can put king in check?

Double check is a fine tactic. An example would be a bishop lined up on the same diagonal as the king with a rook or knight in the way blocking the check. The rook or knight moves giving check to the ...
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20 votes
Accepted

Is it possible for a white piece to deliver check to the black king, but for black's counter move to result in white getting checkmated?

You can find some examples in the following game collection: Games where check is answered with checkmate. Among those games, Nigel Short vs Alexander Morozevich, Russia - The Rest of the World (2002)...
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20 votes

Why is offering draw not recorded but giving a check recorded?

Both recording checks and draw offers are personal preference, and neither is required in your notation. I actually do record both checks as "+" or "++", and draw offers as "(d)". I know I am not the ...
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20 votes
Accepted

Why is offering draw not recorded but giving a check recorded?

According to the FIDE Laws of Chess: Appendix C. Algebraic notation C.12 The offer of a draw shall be marked as (=) As with a number of the laws regarding recording of the moves this is not ...
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18 votes
Accepted

Moving a piece out of the way to check

You can move your other piece to make your queen attack the king in a normal position such as: 4r3/8/8/2QB1k2/p5q1/3K4/8/8 w - - 0 1 1.Bf3+**[Discovered-Check] (1.Be4+**[Double-check]) But you are ...
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  • 1,289
18 votes
Accepted

Is triple check possible?

Triple check is impossible, unless you want to count an x-ray attack as the third check. A queen and rook attacking on the same file is normally thought to be one check.
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  • 3,062
18 votes

Is triple check possible?

To look at this systematically, let's say white is attempting to triple-check black. At the start of white's move, black's king is not in check. So we have to go from zero checks to three checks. When ...
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18 votes

Moving into check for a draw as black, why is it illegal? Comparison to Racing Kings

Those are just the rules of the game. You could absolutely try to make the case that moving into check in such a situation should be legal, but playing by those rules wouldn't be chess anymore (it ...
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17 votes

Moving into check for a draw as black, why is it illegal? Comparison to Racing Kings

I will answer from a different perspective: why Racing Kings (RK) has a rule to allow black a chance to draw, and why the same logic doesn't apply to chess. What is Racing Kings (RK)? Background for ...
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  • 4,850
16 votes

Can a player in check win, by checkmating the opponent, while not getting themselves out of check?

No, this is not legal. The fact that the black king is still in check from the white rook overrides every other consideration. It doesn't matter that (were it not for the white rook) Black's move ...
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  • 5,570
15 votes

Can a rook put an opponent's king in check as a result of castling?

Yes, of course he can; you're indeed in check. Imagine if checks didn't exist--then on the next move, if your king hasn't moved, he could just take your king with his rook.
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15 votes
Accepted

Is it ethical to force a draw via perpetual check?

There is a rules in chess called Threefold repetition rule. This rule states that you can claim a draw if you are about to repeat the the position for a third time. This subsumes a situation called ...
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14 votes

He has two queens. I have one. Is it proper chess etiquette to check him non stop just to avoid losing?

What you are describing is Perpetual Check: http://en.wikipedia.org/wiki/Perpetual_check It is covered in the rules of chess and the result of such a game is a draw. It is up to your opponent to try ...
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14 votes

Must one say "queen check" before capturing a queen?

The important part is that you and your friend agree on what to say and when. If you both agree that queen check (or gardez) is a nice thing to say, then go ahead and say it. I suggest taking the time ...
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13 votes

It's not check but the next move is checkmate

If it is your opponent's turn to move and none of your opponent's pieces can move other than his king, and the king would be in check on any square it could move to, we would call that stalemate. In ...
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12 votes
Accepted

Checkless Chess

Your "checkless" chess AI would run into problems with the stalemate rule. It would consider the poaition with white king on a6, white pawn a7, black king a8, a win for White because wherever Black ...
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  • 3,236
12 votes
Accepted

How do computers play three-check chess?

https://github.com/ddugovic/Stockfish Very active development, this is the Stockfish version used by lichess. What you need to do is search this macro: #ifdef THREECHECK Evaluation function: ...
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  • 21.4k
12 votes

How do computers play three-check chess?

I have been working on the aforementioned code of Stockfish for three-check chess, so I will try to summarize the most important evaluation changes (in terms of Elo gain) we made compared to standard ...
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12 votes

Can a king be checked with another king when checking square is protected by the side which gives the check?

Hi David and welcome to chess.stackexchange.com. This is a common question. It's illegal to move a king into check, or to leave it in check. This includes moving a king adjacent to the opposing king....
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