Questions tagged [check]
Questions relating to check
94 questions
2
votes
1
answer
919
views
What happens when touching a piece which cannot make a legal move?
Suppose in an official tournament game, White's king is in check by the Black queen. If I accidentally touch a pawn that cannot legally remove the check, how is the touch-move rule enforced? After ...
- 131
5
votes
1
answer
911
views
A check given by castling: is it a discovered check or a special case?
As far as I know, there could be as many as four possible types of check if we want to be as specific as possible:
1) a simple "active" check. I am not sure if there is a separate term for ...
- 823
4
votes
6
answers
7k
views
How many queens can check a king without it being checkmate (with no other pieces on the board)?
I am going to write an autobiographical story. The motive is therapeutic. I suffered abuse from my father, and at the age of 20, I developed delusional disorder; the psychosis lasted for 20 years, and ...
user36292
0
votes
2
answers
265
views
About the importance of a "check"
Watching chess online on Youtube (Eric Hansen, Daniel Naroditsky, Kevin Bordi ...) playing blitz I noticed that they often try at first to avoid a "check" even if the potential following ...
- 627
4
votes
1
answer
269
views
Longest sequence of unique legal moves for one player, always in check and ending in checkmate
I recently played a bullet game, in which I thought I was in checkmate, but then realized I had one legal move, this then repeated again and again 6 times until ultimately I was in checkmate. I share ...
- 51
17
votes
1
answer
4k
views
Why did white sacrifice knight in this Nimzowitsch's 1905 game?
Saw this image in a WhatsApp group. Initially it looks attractive with a possibility of a "smothered mate", but I am unable to find out if white can really survive for several variations.
[...
- 776
1
vote
1
answer
2k
views
Was my opponent in check?
I’m new to chess and I had my queen on the left one space away from the king which was on the right and he was unprotected, is that check?
E.g., take the following sample position (note: not provided ...
- 27
0
votes
1
answer
492
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 ...
- 11
1
vote
0
answers
91
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
196
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 ...
- 113
3
votes
1
answer
388
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
229
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 ...
- 1,173
22
votes
8
answers
11k
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
585
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 ...
- 135
2
votes
1
answer
155
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"]...
- 31
-1
votes
2
answers
171
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 ...
- 265
8
votes
1
answer
329
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
196
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?
- 239
4
votes
1
answer
285
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.
...
- 1,912
0
votes
3
answers
609
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
1k
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
273
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?
- 133
2
votes
2
answers
321
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 ...
- 21
0
votes
0
answers
73
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 ...
- 1
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
2k
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?
- 23
4
votes
1
answer
242
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 ...
- 453
3
votes
1
answer
130
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 ...
- 31
5
votes
1
answer
300
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
662
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 ...
- 453
1
vote
1
answer
451
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 -...
- 453
26
votes
9
answers
15k
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?
- 369
3
votes
1
answer
136
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 ...
- 626
0
votes
1
answer
752
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
654
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, ...
- 1,502
3
votes
2
answers
1k
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 ...
- 61
2
votes
3
answers
2k
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
1
vote
2
answers
409
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 ...
- 31
1
vote
1
answer
267
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).
...
- 9,299
5
votes
1
answer
391
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 ...
- 228
6
votes
1
answer
617
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, ...
- 252
10
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 ...
- 867
3
votes
3
answers
4k
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
420
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+
.
[...
- 345
50
votes
6
answers
17k
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?
- 731
3
votes
1
answer
387
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 ...
- 17.8k
6
votes
3
answers
8k
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
372
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
10
votes
4
answers
572
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 ...
- 4,117