Questions tagged [checkmate]

Questions relating to checkmating.

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3 votes
1 answer
100 views

Most delaying moves before checkmate

Consider a position where if was player A's turn, they could make a series of moves ("the mating sequence") with forced mate. However, it is player B's turn, and they can make a series of &...
2 votes
1 answer
141 views

On a toroidal board, which pieces are needed to checkmate?

I saw this question On an infinite board, which pieces are needed to checkmate? and was inspired by it. Many mating combinations won't suffice on a toroidal board. For example, queen vs king will be a ...
0 votes
2 answers
392 views

Checkmate with only relevant pieces

What is the maximum number of black and white pieces which are relevant in a checkmate position (by White)? That is if any piece (black or white) was removed from the board, the checkmate would not be ...
-3 votes
0 answers
75 views

Redefining Check and Checkmate [duplicate]

I used to define checkmate as “the point in the game when person A’s king is capture-able on person B’s next move no matter the response of A”. This is not true. In the image below, black “could” ...
14 votes
4 answers
1k views

Outside-the-box mate-in-one challenge

I've received an (I would say impossible) mate-in-one challenge and I have already checked all movements, but couldn't solve it yet. It came from a trustable source and they say you need to think ...
7 votes
4 answers
2k views

Most mate options after 6 moves

Found this construction problem from '83 and liked it. I don't know the best solution (yet), and maybe you can top it anyway. Consider the (help) "game" 1.e4 a6 2.Bc4 a5 3.Qh5 a4. Now White ...
3 votes
0 answers
187 views

The Most Frequent Checkmate Patterns

Of the main checkmate patterns which are the most frequent (in games that ended with a checkmate)? Based on chess literature the Back-rank mate is arguably the most common, I would expect the Queen ...
9 votes
6 answers
20k views

Check for checkmate

So I am implementing an intelligent chess agent but I can't get the checkmate working. I was wondering if there is a program that takes the chessboard notation and returns a result of yes or no to ...
4 votes
3 answers
419 views

Does this knight and rook mating pattern have a name, or has it occurred before?

[fen "5k2/8/1R6/5r2/P7/1P4P1/6KP/5n2 b - - 0 40"] With black to move, remarkably it's mate in 2 (at first glance, it looks like black may struggle to even draw). It occurred in a recent LiChess game ...
2 votes
2 answers
232 views

Is there a name attributed to this type of checkmate pattern?

I was going over an old lichess.com game when I realized that the checkmating pattern seemed familiar. [FEN "5rk1/p4pp1/1p5p/2p4Q/2P3R1/P4q2/6RP/4r2K w - - 0 1"] Here it is boiled down, ...
2 votes
4 answers
310 views

Is there a name for this mating pattern?

What's the name of the mating pattern starting with the move 21...Ng4!? [FEN ""] 1. d4 Nf6 2. Nc3 c5 3. d5 e6 4. e4 exd5 5. exd5 d6 6. Nf3 Be7 7. Bb5+ Nbd7 8. a4 O-O 9. O-O b6 10. Bc6 Rb8 ...
20 votes
4 answers
6k views

Is there a double-forced mate position?

A usual forced mate position is where the winning player can play in a way that ensures checkmate, no matter what (legal) moves the opponent makes (unless the game ends due to a non-play reason, i.e. ...
4 votes
1 answer
1k views

Mate in 4. Difficult. Going crazy

A friend sent me this puzzle. He insists that Black has a mate in 4. I just can't find it. Can someone see a mate in 4 moves here?
1 vote
1 answer
133 views

Are Stockfish "Mate in X" counts ever over-optimistic?

When Stockfish gives an evaluation of, say #15, I have seen cases where this is pessimistic, and it subsequently revises its evaluation to say #9. Are there cases where it thinks it can mate in 15, ...
0 votes
1 answer
87 views

Why does Stockfish only gives -28 to a game with only a W pawn and a B rook remaining, while it should be resolved in perfect play?

In this position (W resigned) with only a pawn and a rook remaining Stockfish should have resolved the game and say "Mate in xx" (with perfect play). However Stockfish is said to have ...
0 votes
1 answer
195 views

Questions about legality of last move

Question for FIDE Arbiters and similar knowledgeable folk... FIDE Law Article 5.1.1 The game is won by the player who has checkmated his/her opponent’s king. This immediately ends the game, provided ...
0 votes
2 answers
161 views

Mate in 2 from "The soviet Chess Primer" but wrong

I found this exercise on page 51 of the "The soviet chess primer" and I think there is a mistake. Chess.com analysis says there is a mate in 13 moves. I'm correct thinking there is a mistake?...
-2 votes
1 answer
229 views

Mate Solving or problem solving software

I have some positions in my games which engine analysis indicates that some lines (not the ones I played) lead to a checkmate in 6 or 7 or 10 moves. But normal engines are not reliable here so I use ...
28 votes
6 answers
13k views

Why is this a checkmate?

I'm new to chess and I'm confused about a puzzle I was practicing. As you can see my black queen has put the white king in check, but I'm confused how this is possible if a rook is right next to my ...
0 votes
0 answers
134 views

Unique checkmates count analysis

How many unique checkmates are there from this starting position? I can only see 5 lines on lichess from a game I've played and have tried several different moves. Mate in 4 is the fastest but I've ...
2 votes
1 answer
196 views

Is there any sequence of premoves that guarantees checkmate in this particular King + Queen vs King endgame?

King + Queen vs. King is perhaps the most basic winning endgame and known to be mate in at most ten moves. However, I am wondering if there is any sequence of premoves that guarantees checkmate? For ...
2 votes
2 answers
178 views

Timeout vs Insufficient Material

This is not a new topic but it did happen in my game at chess.com. I was playing white and played the only legal move h7 and was checkmated on the next move. My question is: What will happen if I just ...
14 votes
1 answer
3k views

Checkmate in ω² moves with finitely many pieces

The post Checkmate in ω moves? has inspired a lot of discussion and mathematical research into positions on an infinite chessboard where white can mate in a transfinite amount of moves. The current ...
0 votes
1 answer
135 views

A puzzle where you must find the mate in 3 solution but avoid mate in 2 and mate in 1 solutions?

I want to see if a puzzle could exist where you must avoid finding mate in 1 or 2 but just find the mate in 3 solution. This is not subjective it is a hard math problem to make a move that forces mate ...
15 votes
5 answers
1k views

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?

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? Has this happened in games between top players?
6 votes
0 answers
228 views

How much would chess change if Black always had the last move?

In a hypothetical minor variant, could White's first-move advantage be compensated for by Black's right to last move? Normally, White wins have White play N+1 plies to Black's N. How would the game ...
0 votes
1 answer
136 views

Why did I lose -> I thought I can swap king and castle to avoid checkmate? [duplicate]

[FEN "6nN/Bp1k2pp/2n5/p7/Q4R1P/5pP1/P3qN2/4K2R w K - 0 1"] As you can see my king got checkmated through the enemy's queen and pawn. My question is, why is this a checkmate? I haven't moved ...
-2 votes
1 answer
199 views

The king had a place to move, how is this checkmate?

The king had a place to move, how is this checkmate?
7 votes
4 answers
1k views

What is the highest number of pieces from one side that can be involved in a checkmate?

What is the highest number of pieces from one side that can be involved in a checkmate? "Involved in a checkmate" is defined below. A non-king piece is involved in a checkmate 'if removing ...
8 votes
2 answers
2k views

Most pieces involved in checkmate in actual game?

I recall seeing a number of chess games where a lot of pieces are involved in the final checkmate, and was curious to know what is the maximum number of pieces of one player A that have been involved ...
3 votes
1 answer
234 views

Mate-in-N problems where N scales indefinitely with board size

Motivation - Long range mating patterns This question is inspired by my recent interest in infinite chess and the post on MathOverflow Checkmate in ω moves?. Since my chess endgame skills are quite ...
5 votes
1 answer
220 views

Running out of time mid promotion to checkmate. Who wins?

In a casual blitz game I had with my friend, my last move was to promote a pawn, to ladder mate my opponent (there was already a rook on the 7th). I moved the pawn, but while I was reaching for the ...
21 votes
5 answers
7k views

A position with the only legal move resulting in checkmate

Theoretically, is it possible that for some position, the only legal move for a side leads to a checkmate (that is, the opposite king gets checkmated)? If so, has this ever occurred in a real game?
30 votes
9 answers
12k views

Why is it not a checkmate?

I am new to chess. I have tried to learn checkmate from the video lesson in chess24 website. There, in one question, it marked my answer wrong and said that it was not checkmate. Can anyone please ...
4 votes
0 answers
88 views

King and short rook checkmate

Suppose White has a king and a range-x rook and black has a bare king on a chessboard with dimensions y times y. What is the minimum value of x such that for all sufficiently large y, White, moving ...
8 votes
4 answers
7k views

Can a pawn move 2 spaces if doing so would cause en passant mate?

You cannot place your King in check, the en passant could be refused and because you are not placing your King in check directly it seems you can move your pawn 2 spaces. However, just like castling, ...
3 votes
2 answers
351 views

Are there any hard mate-in-2 problems?

I'm interested to know if there are any particularly challenging mate-in-2 problems. Since the second move will be essentially forced, the problem essentially comes down to 1 move. Typically, the ...
7 votes
1 answer
475 views

How to checkmate with king + two knights vs king + pawn

King + two knights vs a king is a book draw, as the knights cannot get the enemy king into a checkmating position (only a stalemating position), because of the inherent clumsy nature of the knight. ...
12 votes
2 answers
3k views

What is the fastest loss by a GM in a FIDE classical game?

What is the shortest FIDE classical game a grandmaster lost? It can be either resigning or checkmate. The opponent doesn't necessarily need to be GM. Forfeits don't count. Only serious games count, ...
1 vote
1 answer
158 views

Can a castling checkmate be engineered from this position?

I get the following position pretty often in online bullet as White. It's mate in a few (for instance, 9. Bf4+ Kc5 10. Qd5+ Kb6 11.Qb5#). Needless to say, the setup is dubious. This looks like a prime ...
-2 votes
2 answers
238 views

Why is this the wrong move?

I am new to chess. I am playing puzzles on chess.com. I made a move which I thought was checkmate, but it tells me I made the wrong move. It looks to me like the King is in check by the bishop. But no ...
4 votes
2 answers
4k views

Can I capture my own pieces?

This may seem like a very amateur question, but I was playing chess with my dad, and when my dad won, I realized that I could've captured my own pawn in order to evade checkmate. I tried to do this ...
1 vote
1 answer
178 views

Can a rook and King checkmate a bare King without zugzwang?

Can a rook and a king force a checkmate against a bare king that starts in the center if the opponent was allowed to pass?
1 vote
0 answers
165 views

How often do super GMs blunder mate in 1?

Yesterday (5th April 2023) Nakamura blundered a pretty mate in 1 against Caruana in the Chessable Masters: [Title "Caruana - Nakamura, Chessable Masters 2023"] [fen "Rb6/5kp1/8/1r1P3P/...
17 votes
2 answers
288k views

With only a king left, how many moves remaining until a draw?

I am a beginner in chess. If I have only a king left, how many moves does my opponent have to mate me?
-2 votes
1 answer
205 views

My opponent won despite his king having no legal moves

My opponent won despite his king having no legal moves. Why?
5 votes
2 answers
817 views

What is the longest current tablebase mate with a unique optimal line?

Having been inspired by an article on ChessBase.com, what is the longest current tablebase mate with a unique optimal line? By unique, I mean for each of the winning side's plies, there is only one ...
10 votes
2 answers
605 views

Mate in One the Missing King

The post "A mysterious mate in one" made me think of one of my last problems which is also a Mate-in-One with no black King: [Title "White to move and mate in one"] [FEN &...
4 votes
1 answer
241 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 ...
8 votes
2 answers
856 views

Checkmating the bare king with 3 knights – can the mate be forced on any edge square?

In the case where White has King and 3 Knights, and Black has just the bare King, it is known that White can force checkmate. But can White in fact pick any edge square in advance, and force the ...

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