Questions tagged [check]

Questions relating to check

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0 votes
1 answer
80 views

Can a king capture a piece in front of the enemy king [duplicate]

Can I eat a piece in front of the enemy king with my king? For example: My king was on b6, the enemy knight was on b5, and the enemy king was behind the knight on b4. So can I capture the knight with ...
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1 vote
0 answers
72 views

A double pin: does this count as check? [duplicate]

I was thinking about this position. [FEN "4k3/8/4q3/8/8/8/8/2K1Q2r b - - 0 1"] [startflipped ""] Can the Black queen move to another file? If she moves then there is nothing ...
  • 119
0 votes
1 answer
158 views

What is the longest possible sequence of consecutive checks without captures?

The best known answer (54) for arbitrary checking moves is given in What is the theoretical limit for the number of consecutive checks?, but I'm interested in sequences without captures. As usual, the ...
2 votes
1 answer
182 views

Why is this a Checkmate? Pawn can capture queen?

I am just learning Chess. Why is this a checkmate? It's Black's turn, and White's queen threatens Black's king, so check. But if I play gxf8, the check is gone. Why doesn't the game let me do it?
1 vote
1 answer
137 views

Does 3-check help you in any way for normal chess?

Does a variant called 3-check, where you have to check the opponent 3 times to win, actually improve your train of thought and analysis of normal chess, or is it close enough to normal chess to ...
  • 1,085
22 votes
8 answers
10k views

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

Consider a player who is in check. Suppose they can make a move that would checkmate the opponent, but would not stop themselves from being in check. Would that be a legal move? For example, in the ...
  • 245
0 votes
3 answers
399 views

Escaping a double check

Escaping a double check The answer to Is it possible to block a double check? says Moving the king is the only way to escape a double check. There is no possible other move that will block both ...
2 votes
1 answer
135 views

Can Black draw by perpetual check?

In this position, from the game Carlsen-Radjabov, it is White to move. Is it possible to get rid of the checks? [Title "Carlsen-Radjabov, World Blitz Championship, Moscow Russia, 11/18/2010"]...
-1 votes
2 answers
146 views

Could FIDE make a rule allowing for a visual announcement of check and checkmate?

Using verbal methods in announcing check and checkmate in tournaments is, for the arbiters, the players etc, unpleasant. But, on the other hand, prohibiting any means for an announcement is annoying ...
  • 249
8 votes
1 answer
235 views

Is a both-sides forced perpetual check possible?

There are lots of positions where one side can force the other into a perpetual check. Is there any position in which there are no legal moves besides continuing the perpetual from both sides? For ...
-1 votes
1 answer
188 views

Can there be a position in which a player blocks check with checkmate?

Let's say that the first player gives a check to the second. player. Then the second player blocks and gives a checkmate. Is it possible?
4 votes
1 answer
213 views

Queen versus rook endgame: to check or not to check?

Most tutorials the K+Q versus K+R endgame claim that at some stage, the key is to force the rook away from the king, then it is supposed to be easy: give a series of checks and fork/skewer the rook. ...
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0 votes
3 answers
303 views

Is it possible to be in check by three pieces? [duplicate]

Is it possible to be in check with three pieces? My thoughts so far: A normal move can't, due to the fact that you may only unblock one piece to make a discovered check, and then that piece may also ...
  • 109
3 votes
6 answers
724 views

Is blocking a check with a check an illegal move?

Say my opponent puts me in check. If I move my queen to block the check and it also puts my opponent in check, is that legal?
  • 49
3 votes
1 answer
214 views

5D Chess - Why is white king not in check in this position?

Why cannot black rook on c5 in the bottom timeline capture the king on c5 in the top timeline? Why is the king not in check?
2 votes
2 answers
266 views

What is the solution to single-check chess?

Single-check chess is a variant where the first person to give check wins. There is a website that claims it has been solved, with white winning in four moves; however, I cannot find the moves ...
0 votes
0 answers
52 views

Can someone explain why this is checkmate for white? Can a king put another king into checkmate? [duplicate]

I am just learning to play chess so bear with me please :). I understand that the black king cannot move to d8 or f8 because of the white rook, nor d7 or f8 because of the white bishop. But why can it ...
11 votes
1 answer
2k views

Series of illegal moves in check

This question falls under FIDE rules (USCF answers/comments welcome). If I make an illegal move leaving myself and my opponent in check, hit the clock and my opponent misses it and then continues play ...
  • 221
-1 votes
2 answers
652 views

If not in check, can a king capture an opposing chess piece?

If a king is not in check, can it capture an opposing chess piece?
4 votes
1 answer
174 views

How is a perpetual check reached in this puzzle?

This puzzle on chesstempo caught my eye. We play as White: [FEN "4Q/4p1bk/1p1qp2p/p1p1n2B/4P/2P3B1/PP4P/6K b - - 0 1"] 1. Nf3 Side Note: The answer is of no importance here, so no spoilers ...
3 votes
1 answer
108 views

Can you move from one side being checked to other side in stalemate?

I am not a chess player but I have a homework where I have to code a chess program. I would like to know if it is possible for a player's piece to be in check, the player to move out of check, and in ...
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5 votes
1 answer
180 views

Using a check-preventing piece to protect the checkmating piece

Let's say that a piece is protecting my king from check, i.e. blocked or pinned. For example, my rook is in the way of my opponent's queen in checking my king. Can I checkmate their king with another ...
3 votes
2 answers
502 views

Why does White play Nc4?

I was solving some problems on chesstempo. This one caught my eye (the White just played Ng2, we play as the Black): [FEN "1k5r/pp4p/5b1p/qPP/N2r1p/P4P/K1Q3PP/2R3R w - - 0 1"] 1. Nb2 I saw ...
1 vote
1 answer
371 views

Why does White play g5?

As a total newbie, I've been solving some medium-level problems on chesstempo. This one caught my eye. We play as Black after White's first move. [FEN "6k1/5p1p/5bp1/p7/P1r3PP/2n2N2/4NP2/1R4K1 w -...
26 votes
9 answers
13k views

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

I was playing a friend and I took her queen. She said that I didn't say "queen check" beforehand. I have never heard of this. Is it a rule?
3 votes
1 answer
121 views

What are the most common checks in chess?

I read somewhere that to optimize move generation for a chess engine it's good to have fast detection of position where one side is checked (to eliminate illegal moves). The author suggested that ...
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0 votes
1 answer
272 views

Checkmate without check beforehand

[Title "fucccommies-Diam0ndJake, chess.com, 7/8/2020"] [FEN ""] 1. e4 e5 2. Nf3 Nf6 3. d4 Nc6 4. d5 Nd4 5. c3 Nxf3+ 6. Qxf3 Be7 7. Bb5 O-O 8. O-O c6 9. dxc6 bxc6 10. Bc4 d5 11. ...
  • 19
8 votes
3 answers
452 views

Infinite sequence of consecutive checks allowing more pieces (say 9+ queens)

This is a task related to this question: Theoretical limit for the number of consecutive checks?. By a sequence of consecutive check, what we mean is white giving check, black replying with a check, ...
3 votes
2 answers
541 views

How to get static evaluation from Stockfish in case that a king is in check?

I am working on a program that should recognize the difference between human and computer players. For this purpose, I need some parameters. A part of them would be the individual values of the static ...
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2 votes
3 answers
404 views

What do you do when you put your king in check and you don’t realise?

I moved my king as I wanted it to be in a safer location and after I did my turn my opponent realised that I put my king in check by accident and as the rules state you cannot put your king in check ...
  • 21
0 votes
2 answers
211 views

Is the game done if your only movement is getting out of check?

If I play as White and use my queen to check Black on every move, and Black can only move their king to get out of the check, can I win the game? White could move something else, but they decide to ...
  • 21
1 vote
1 answer
207 views

How is this move illegal?

I'm black and it's my turn. I'm playing in the Arena chess player against Stockfish. This is my current board: [fen ""] [startply "31"] 1. e4 d5 2. exd5 e6 3. dxe6 fxe6 4. Nf3 Nf6 5. Bc4 c6 6. O-O ...
13 votes
2 answers
5k views

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

In recording a game, one typically does not record offering draws (if yes, how and is it required?) while one does indicate that a particular move gives a check by using + (or ++ for double checks). ...
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5 votes
1 answer
281 views

How can I speed up my check detection in Javascript?

I am trying to write a simple chess engine in Javascript. It performs very slowly but I have finally rooted down the problem to check detection. How might I speed up this check detection? If you have ...
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5 votes
1 answer
406 views

Minimax check(mate) detection

in my minimax function I have a first few lines looking something like this: children = board.get_all_possible_moves(board) if depth = 0 or board.is_check_mate or board.is_draw: return None, ...
  • 242
9 votes
6 answers
5k views

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

I am confused why you cannot move into a check when it can force your opponent to capture your king and expose theirs. In such a case why is there no extra move to result in a draw? In the "Racing ...
  • 819
3 votes
3 answers
3k views

Program that will give all available moves given the state of a board, including check

I am trying to write a program that will give out every possible move for every piece (one move deep) given the state of a board. I have already done this such that it works with everything except ...
  • 141
6 votes
1 answer
391 views

There are three checks in this position?

I found this position in the Chess Programming Wiki. It's a perft calculation. In the depth 2 the results informs that there are 3 checks. But I just able to find 2 checks: Kf1 hxg2+ Kf1 Bxe2+ . [...
47 votes
6 answers
16k views

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

In Blitz games, with very little time left for both players, is it acceptable to keep on checking the opponent and waste their time and win the game on time? Is that true sportsmanship?
3 votes
1 answer
248 views

Knight promotion percentages

Knight promotion is the second most common promotion. Most of the time it is to give an otherwise undeliverable check. But it doesn’t always come with check. Statistically speaking, what percentage of ...
6 votes
3 answers
6k views

If a pawn is promoted to queen beside the king is the king instantly in check?

If a pawn is promoted to queen adjacent to the enemy king, is the king instantly in check?
  • 61
3 votes
1 answer
206 views

Is it possible to block a double check? [duplicate]

Is it possible to block a double-check, or is your only option to move the king? (I'm trying to code a chess game, to then go on to code a chess AI, and this would really help me)
  • 133
8 votes
4 answers
514 views

Maximum number of ways to get out of check

What is the maximum number of legal moves in a legal position, given that the player is in check? It's easy to see that 43 is an upper bound. Let's suppose the white K is in check along a diagonal by ...
  • 3,256
1 vote
1 answer
185 views

Is black in check? [duplicate]

I know this sounds like a really basic question, but I couldn't find it anywhere on the site... On the following board, is the black king actually in check (assuming it's his move)? My thoughts are ...
1 vote
1 answer
281 views

If you fail to move the king out of check (for any reason) what is the status of the game? [duplicate]

I will start by saying I am new at chess. The scenario is as follows. In a particular game you are in check, but fail to move out of check because you and your opponent did not realize this. Since ...
-3 votes
4 answers
317 views

If a king is in check, can the opponent's king take said king if it puts them in check? [duplicate]

If a king is in check, can the opponent's king take said king if it puts them in check? Someone may think they win, but surely you can’t put yourself in check even if the opponent's king has been ...
6 votes
2 answers
596 views

How does Black escape perpetual check here?

In this position, what is a clear line in which Black escapes from perpetual check? [FEN "2k5/7p/p1Q3p1/3pP3/1r2qP2/1P4PK/P7/8 b - - 0 1"]
6 votes
3 answers
10k views

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

Can a white King move next to a black King to check it, if there is a white pawn protecting the white King, preventing the black King from taking the white King?
  • 77
1 vote
0 answers
157 views

Taking the King while (self) being in check in Blitz Chess [duplicate]

In Blitz (5-min Chess) your opponent puts you in check. You then make a move that places your opponent in check. Can your opponent still take your King and claim victory (even though he's in check)?
14 votes
2 answers
3k views

How do computers play three-check chess?

How do computers evaluate three-check chess positions where the first side to check the other side three times wins? How do they value the first and second checks? It looks like the position ...
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