Questions tagged [problems]

Chess problems consist of a board position and a task. Most ask for a line of play that mates black in a set amount of moves, or a combination that results in a winning position. Many other types exist, including, but not limited to, construction tasks for various positions and proof games that have numerous goals, selfmates, helpmates, and retrograde analysis. Tournaments and championships exist for composing of original problems and for speed-solving.

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10
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2answers
3k views

Identify a problem where a potentially winning move draws because of the 50 move rule

I'm trying to recall a particular chess problem. It's related to retrograde analysis. All what I can remember is this: it's an endgame where there is only one way to reach the position, and during ...
24
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2answers
3k views

From the start of the game what is the longest possible series of consecutive white moves where white can do those moves no matter what black does?

From the start of the game what is the longest possible series of consecutive white moves where white can do those moves no matter what black does? So I want the longest list of moves white can do ...
2
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2answers
285 views

Attempting to create a retraction problem

I am trying to create a retraction problem, but I am unsure if it is sound, and I do not know where to find resources on them. I have two questions. Is my problem correct? I am not giving a solution ...
6
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1answer
414 views

What is the record for the most stalemates in one?

Is there a known record for the most possible stalemates in one in a legal position, for with and without promoted pieces? I did some constructing myself for a start. For without promoted pieces, I ...
3
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2answers
247 views

Looking for an old problem that I can't quite remember

I remember seeing a particular chess problem awhile ago on YouTube, but I can't find it. The problem's theme was something about caging in the Turkish king, and the video mentioned it as being old. ...
0
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2answers
646 views

The highest amount of moves by the losing side in a zugzwang

In zugzwang, the usual idea is to limit the number of moves that the opponent can make. But they can also have many moves in certain scenarios. What is the highest amount number of moves by the losing ...
6
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3answers
442 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 ...
6
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2answers
222 views

Looking for an iPhone app for working out chess problems

I'm looking for an iPhone app that will allow me to set up a chess problem and work out its solution. I've seen apps that present me with a battery of chess problems but don't allow me to set up my ...
3
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2answers
311 views

Where can I find these mentioned chess problems?

In his article “The Horse Concoction", Tim Krabbe mentions retrograde analysis problems that involve placing 10 rooks, knights, or bishops on the board for a mate in 1. The 10 rooks problem shown ...
1
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2answers
366 views

A question regarding "The Horse Concoction"

Long ago in 2000, Tim Krabbe presented, a now classic, problem by Harry Goldsteen in his article “The Horse Concoction” on his site. It has blossomed across the Internet, as some of us know. The task'...
9
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1answer
1k views

What is a pure checkmate?

Recently I heard something about pure checkmate. This is a special kind of checkmate where each of the squares around the king has to be covered by just one single piece. One simple example of this ...
31
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4answers
5k views

Endgame problem: How to avoid stalemate and win?

I'm stuck on this problem a friend shared with me recently, with barely any pieces left and apparently white is able to force a win but I've been hitting a wall with everything I've tried so far, as ...
0
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1answer
250 views

Where is there a mate in four (pawn moves)?

From Fine's BCE: I can only see the pawn getting to a2 after 1.d6+ Kd8 2.e6 a4 3.Kf6 a3 4.e7+ Ke8 5.Ke6 a2 6.d7#. That's three pawn moves, not four. What is the more resistant defence I missed?
3
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1answer
375 views

What is a “dual” in chess problems, such as the Babson task?

I’ve read up on Babson tasks, and they mention that all known tasks are not perfect because there are duals. I’m not sure what this means exactly. What precisely is a “dual” in chess problems?
1
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1answer
859 views

What is the longest possible series of consecutive captures?

What is this the longest possible series of consecutive captures in a legal position? Here is an example of 25 on the same square, which is not required. [FEN "q1kr2q1/1qnqnb2/2prp3/q2pK3/2P1P3/...
5
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2answers
511 views

Longest series of mutual "!" moves

Normally I'd pester the/a computer chess forum, but I couldn't register yet... On the Matplus chess forum, the following construction task came up. Both White and Black are on the brink of ...
7
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2answers
660 views

What is the longest possible sequence of double checks?

The record for the most mutual checks in a legal position is known. But what is the record for double checks? There is one rule-threefold repetition applies. Four criteria exist-promoted pieces ...
4
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3answers
788 views

An Interesting Idea: Pinned Pieces Stalemate

I had an idea for a type of stalemate: One side is stalemated with 8 pins in a legal position with as many pieces as possible, with all of the stalemating side’s units being “necessary.” ”Necessary” ...
5
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1answer
575 views

What are the shortest possible games with a) 20 Bishops, b) 20 Knights, and c) 20 Rooks?

The fastest way to get to 18 queens is known. But what are the shortest possible games with a) 20 Bishops, b) 20 Knights, and c) 20 Rooks? Here are my own attempts. Can anybody find/create a faster ...
1
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1answer
191 views

Is there a chess AI that can force checkmate on a specified square?

I'm looking for a program that can force a lone king into checkmate on a specific square. Are there any programs out there that can do this?
3
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1answer
365 views

What is the highest number of forced checkmates in a legal position?

Having been inspired by a similar question, what legal positions have the most forced checkmates for one side and for both sides?
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4answers
277 views

Looking for problems in which a KNN-K mate is forced

Does anyone know of any problems in which a KNN-K mate is forced in the end? It is fine if you make one yourself.
0
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1answer
82 views

Resource for Chess Problems about particular topics

Most puzzles I find are where payout is relatively high. e.g mate in 2-3 moves, play right and get a piece etc. However, I needed a resource which gives me some puzzles/exercises about particular ...
4
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3answers
479 views

Piece And Pawn Only Massacre Games

What are the fastest possible games in which only all pieces and all pawns are captured? I did some searching myself. Pieces Only [Title "me, chess.stackexchange.com 3/2/2019, Non-Unique Proof ...
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3answers
324 views

Is this the quickest way to clearing the board to two kings? [duplicate]

Is 21 moves the least needed to get board down to 2 kings? [FEN ""] 1. e4 d5 exd5 Qxd5 Qh5 Qxa2 Qxh7 Qxa1 Qxh8 Qxb1 Qxg8 Qxb2 Qxg7 Qxc2 Qxf8 Kd7 Qxf7 Qxc1 Ke2 Qxd2 Kf3 Qxf2 Ke4 Qxf1 Qxe7 Kc6 Qxc7 ...
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2answers
310 views

What is the fastest horizontal checkmate for both castlings?

I wish to know the fastest possible castling checkmate, both queenside and kingside, that is horizontal. See my question about vertical checkmates..
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3answers
362 views

What is the fastest vertical checkmate for both castlings?

I wish to know the fastest possible castling checkmate, both queenside and kingside, that is vertical. See my question about horizontal checkmates.
5
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3answers
754 views

Solvable studies that computers fail to crack

Are there chess studies that require an outside of the box thinking that goes beyond the concrete calculation capabilities of today's engines (e.g. Stockfish)? I have sometimes seen certain endgames ...
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2answers
551 views

Is 6 the limit for the most pawns possible on a single file?

As far as I can calculate, 6 is the limit for the most number of pawns on a single file possible. Is 7 possible at all, ignoring promotion? I only took into account using the edge of the board, not ...
0
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3answers
402 views

What are the quckest helpmates delivered by the rook, knight, bishop, and pawn?

What are the quickest helpmates, which is where both sides help administer checkmate to one side, delivered by the rook, knight, bishop, and pawn? The said piece has to deliver the checkmate on the ...
4
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2answers
376 views

Black only has pawns: Mate in what?

In a standard opening position in chess, imagine that all Black pieces are removed except for the king and pawns. [FEN "4k3/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQ - 0 1"] What is the ...
4
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1answer
724 views

Searching for a "where is the black king" problem

Sometime ago, a friend showed me a position where he had the Black king removed. The goal was to find where is the Black king using some pretty weird reasoning. There were only a few pieces on the ...
19
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5answers
4k views

What is the theoretical maximal material difference of a dead draw which is not a stalemate?

I have noticed the following example, which should be a dead draw: I am wondering what is the theoretical material difference of a dead draw which is not a stalemate? (I am not asking about agreed ...
1
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6answers
390 views

Position with the largest material imbalance that is a draw, no matter whose turn it is?

I am curious if there is a known position with the largest material imbalance that, no matter who it is to move, the weaker side can hold a draw.
3
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3answers
324 views

What is the quickest way to reach a mutual, symmetrical stalemate?

What is the fastest known game that ends that in a mutual stalemate position that is symmetrical?
4
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2answers
375 views

Can we say for sure that Black's king has not moved?

The following position appears as the 7th puzzle of Raymond Smullyan's Arabian Knights, a book about retrograde analysis. [FEN "3qk2r/p2pp1bp/bpp2n2/8/3N3Q/1PN1P1P1/P1PPP2P/3K1n2 w - - 0 50"]...
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3answers
443 views

What are unsolved problems in chess? [closed]

Are there any problems in chess that remain unsolved?
13
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1answer
4k views

What is the least number of knights needed to cover the entire board?

I’ve seen the solutions to the lowest amount of queens, bishops, and rooks are needed to cover an entire board, as in they can attack all squares and are the only type of piece on the board. What is ...
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2answers
369 views

What is the fastest en passant checkmate after all other such captures?

I had an odd idea. What is the fastest way to checkmate via en passant after all other en passants have been completed?
3
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1answer
518 views

What is the maximum number of en passants possible?

Out of curiosity, how many en passants can theoretically be done by both sides, and what is the fastest way to achieve that result?
0
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1answer
167 views

super stalemate [duplicate]

Your challenge. Find a position such that one side cannot make any legal or illegal moves. I.E. Make it such that that even if you were allowed to move your king into check there would still be no ...
11
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2answers
801 views

Benko's three-mover that stumped Fischer

In Christian Hesse's book The Joy of Chess one reads about a mate-in-3 problem composed by Pál Benkö that stumped Bobby Fischer. Hesse gives the following diagram: [FEN "8/8/8/4k3/8/8/8/2BQKB2 w - - ...
12
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1answer
3k views

What is the longest proven forced win (including 50 & 75 move rules)?

What is the longest (currently discovered) number of moves for a forced mate position where players will use both the 50-move draw rule and the 3-fold repetition rule if it will help them avoid losing?...
7
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3answers
303 views

Must chess studies be composed?

My question is on the definition of the term "study." If there is an interesting endgame position that occurs in a real game between two real players, and the position is later posed to somebody who ...
13
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3answers
1k views

Using the king to prevent castling

What is a more difficult problem which involves using the king to prevent castling than the following problem? White to play and win: [FEN "r3k3/5p2/2K2P1P/b1N1P2P/8/8/4n3/8 w q - 0 1"]
1
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3answers
327 views

How does white mate in two?

[FEN "7Q/p1p1b1B1/6r1/2p3kp/4Bp1q/7P/PPP2PP1/6K1 w - - 0 1"] (source) In this problem, it’s White to move and mate in two. What is the solution?
0
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1answer
447 views

White gives checkmate in two moves

[FEN "5rk1/2Q2ppp/p7/2P5/1p6/1B5P/Pq2nPP1/3R1K2 w - - 0 1"] White, to move, gives checkmate in two moves. Can anyone find the solution?
5
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2answers
384 views

Easy mate in three

This time an easy puzzle I made up today. White mates in three. [FEN "7k/4Kp2/P4Np1/6R1/8/R6P/8/8 w - - 1 0"]
16
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2answers
3k views

Can white win in this almost 20 year old puzzle?

It's White to move-can they force a win?. The left bottom is a1 as usual. [FEN "4k2r/6p1/p4pKb/p2N3p/p7/p5Q1/p1n5/qrn5 w - - 9 9"] Note for people who saw an earlier version: the position ...
19
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4answers
3k views

Fastest possible checkmate by en passant

En passant is somewhat of a rare move in chess. Checkmating by en passant, however, is an even rarer occurrence. But suppose both sides had the same goal to help cause a checkmate to their opponent ...

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