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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Position where neither player can force a win and neither player can force a draw
One sometimes sees the claim that in every chess position, either White has a forced win, or Black has a forced win, or both players can force a draw.
While this claim is "morally" correct, ...
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Pinned piece chain
How long a "Pinned piece chain" can you make?
Here a "Pinned piece chain" is a chain of pieces where each is pinned by the last.
Here for example is a chain of length 3.
The ...
- 153
2
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How can I mate the black king in 4 moves or less (helpmate)
In this helpmate puzzle, it is White to move.
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Is there a position with the stupidest possible move?
I define a stupid move as a move that
puts the opponent in zugzwang so that all their moves result in mate in one (weaker version: a loss);
is chosen instead of a move that gives mate in one (weaker ...
- 229
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3
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What is the maximum number of moves in a position of Crazyhouse?
We know that the maximum number of moves for a given colour in a legal position of standard chess (or at least record so far) is 218.
What is the record we can come up with for Crazyhouse?
Note that ...
- 2,219
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4
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Least amount of "points" to mate a berserk king
"Berserk king" is my own invention ;).
It means that you play according to the normal chess rules, until a king is mated. At that point the mated king is allowed to do TWO moves, in a last ...
- 356
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A helpmate in 15 moves
I recently came across this ChessBase India article on "engine defying problems." Here's a problem from the helpmate section. We need to reach the helpmate in 15 moves. I thought for a long ...
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Why are capturing key moves "frowned upon"?
Wikipedia's article on Babson tasks says:
However, Yarosh's problem has a small flaw: the key is a capture, something which is generally frowned upon in problems.
(The "key" of a chess ...
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Shortest game to "elegant" mate
Define an "elegant" checkmate as one in which
the king is not on the edge of the board
the king and each of the 8 squares surrounding it are each attacked by exactly one, different opponent ...
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2
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Is it possible for black to win this?
[FEN "5bbk/5p1p/3b1P1P/6PK/8/8/8/8 w - - 0 1"]
How does Black get out and is it possible for Black to win? And if so, what is the least amount of moves it takes Black to win?
It is Black to ...
- 1,085
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2
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Puzzle: Forced game end in at most two halfmoves
Compose a position where
It's White to move
White can deliver checkmate or stalemate in 1 move
Or if they make a different move, then Black can deliver checkmate or stalemate in one 1 move
I needed ...
- 11.7k
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2
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Stuck on a mate in 3
I've been stuck on this for the longest time. At this point I would just like confirmation it is possible.
[Title "White mates in 3"]
[FEN "8/8/8/2N5/8/2k1N3/Q3r2q/K7 w - - 0 1"]
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Fastest algorithm to give mate with K+R vs K on infinite large board as function of starting position
Consider a board with only two edges that are perpendicular.
Something like:
.------------------------------------------------------
| ^
| ...
- 356
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Which piece was captured last - knowing that this position was reached in the minimum number of moves possible?
This is a puzzle that I made a while ago, but never really published anywhere before (although I posted it on an obscure Dutch telegram channel).
The question is simple: what was the piece that was ...
- 356
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Explanation of Hard Puzzle #34
Wikipedia defines a chess tactic as:
In chess, a tactic refers to a sequence of moves that limits the opponent's options and may result in tangible gain.
I'm having a hard time understanding a ...
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How do you solve vague mate in two problems?
I am a big fan of solving mate in N problems and believe they help tremendously with i.e. visualization. The only issue I seem to face in certain problems are when they are very vague. For example ...
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Bishops standing on their toes
Another silly idea:
[FEN "1B1B1BkB/B1B1B1B1/1B1B1B1B/B1B1B1B1/1B1B1B1B/B1B1B1B1/KB1B1B1B/BNB1B1B1 w - - 0 0"]
How many bishops must be removed such that the position is won? How long does ...
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1
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Chess against Chuck Norris (starting position with lots of queens)
Just plain silly.
Replace all pieces of Black (except the king — you are not Chuck Norris, you must have one) with queens. The starting position is then a Mate in 3 (#3).
Challenge: Replace only a few ...
- 11.7k
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0
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The king fell off the board
Give a position (White to move) with the bK missing. If it is inserted on any legal square, it is mated in one move by the wQ, with a different mate for each square.
(Point of side conditions: If you ...
- 11.7k
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Duplex forced selfstalemate
Ludwig Zagler, Chess Ultimates 12/1974
[FEN "3nBb2/3PRP2/2ppPPpp/2nk2pb/2p2QN1/1r1rBKP1/7q/8 w - - 0 0"]
self=1, 7 solutions
This is the record (7 variants) for forced single side ...
- 11.7k
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Play a chess game so that at the end you can start a game of checkers
Yes, it is silly.
So you begin at the normal starting position and help-play
until Black is mated (White shall have the last move since Black begins in checkers) and the mating position looks like the ...
- 11.7k
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What is the highest possible number of pawn captures in a game?
What is the highest number of pawn captures possible in a game?
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Analyse a blunder
Black (me) to move.
I took the knight at f3 with my knight at e1. However, Lichess analysis shows that this move is a blunder, and suggests to take the bishop at g2 instead.
IMO, I am winning no ...
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Chess problem where white mates on move 5 by underpromoting to a knight
The problem
White must start with 1. e4. On move 5, white must underpromote to a knight for checkmate.
IM Miodrag Perunovic told me recently that he sent this problem to Garry Kasparov for his ...
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A special "dead" position
Construct a position which forcibly leads to White or Black being stalemated (and both events are actually possible), meaning that the position is already dead. Further (or it would be too easy) all ...
- 11.7k
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What is the largest n such that discrete forced mate in one through mate in "n" through exist?
This is admittedly a bit of an obscure question, so I apologize for the awkward wording of the question. To begin, assume you are playing as White, and that a "forcing move" is any move that ...
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When material is counterproductive (construction task)
Give a position where :
White has all 16 pieces.
Black has a king and a single pawn,
White, to move, loses. Bonus kudos if White can't stop a #1.
Remove any single piece (except the kings, of course),...
- 11.7k
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Can all 64 squares be attacked or defended by the eight pieces?
Can you place the eight (non-pawn) pieces of one color on an otherwise empty chess board, such that every square (including the squares that pieces are on), is attacked / defended?
This is a problem ...
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Two seriesmover stalemate constructions
Easy one: Starting position, but Black never moves. White makes n moves (no checking!) until Black is stalemated. Minimize n. Hint: You don't need to capture all Black pieces, pawns can also be ...
- 11.7k
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What should Black do?
I am reading “Ten Ways To Succeed In The Opening“ by Tim Onions and David Regis. On page 48, there is a problem I am trying to solve.
However, I can’t figure out what Black should do next.
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Add as many potential moves as possible by move
8/8/7K/p7/R3b2k/6rP/4p3/4B1N1 w - - 0 1
This is an age old record by Shinkman: Black is stalemated if having the move, but the White move 1.Bb4 grants 32 moves. (Don't bother trying to top that...)
...
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What is the shortest sequence of moves to move all of White's pieces up to at least the third rank?
What is the shortest sequence of moves to move all of White's pieces to the third rank or beyond? Assume in this situation that Black is cooperating in trying to achieve this goal, and as such is ...
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What checkmating move takes the most moves to set up?
An extension of this question.
What checkmating move requires the greatest number of moves to be played in a game?
A move is distinguished by:
what colour is moving [unlike the previous question]
...
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What move requires the greatest number of moves before it could be played in a game?
The move e2e4 could be played on move 1. (One half-move)
The move e7xd6 could be played no earlier than by black on move 3 (6 half-moves).
What move(s) has the latest "earliest possible move it ...
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What is the longest possible forced checkmate sequence?
As title says. My question is about legal positions (positions which could be reached in actual games), but if there is a known solution with an illegal position to start the sequence, I'd be ...
- 151
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What is the chess position with biggest X, where no matter what legal move black/white does, a specific player will be mated at a max X moves later?
There are positions where no matter what legal move black or white does during this sequence of moves, an specific player, will always be mated after X moves (sometimes earlier, but after X moves its ...
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Smallest number of moves needed to mate a lone Black king on e8 with all White pieces [duplicate]
Imagine that all White pieces are in their initial position and Black only has their king on e8. What is the smallest number of moves needed for White to give checkmate?
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The quickest selfmate in 2
Duh.
Clearly, the one shown there with Qxh5+ Rxh5# can be easily turned into a s#2, by e.g. B-e2-f3, Qe2 from White and c6, Q-a5xd2-d1 from Black. 9.0 moves if I added correctly. Someone care to beat ...
- 11.7k
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The fastest dualed mates in n
Hauke Reddmann asked a cool question about the quickest dual-free mates in n's from the starting position. But this is a rather limited scope. I wish to attack this idea from a different angle. What ...
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Can a stalemate be forced even if it is the opponent's turn to move first?
Here are examples in which the side that desires a stalemate can force a stalemate, provided it is their turn to move.
Are there positions where the side which desires a stalemate does not presently ...
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How many unoriginal pawn moves can be made in a single game?
Consider an "unoriginal pawn move" to be a pawn move whose notation matches a move already played in the game. For instance, after 1.e4 e5 2.d4 exd5 3.e5, there is one unoriginal pawn move, ...
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Can there be a checkmate with maximum points of material (103) while covering 64 squares?
Is it possible to compose a game where these three conditions are simultaneously satisfied?
No White piece is gone but every Black piece except the king is.
All the white pawns are promoted to a ...
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If repetition loses, who wins KvK?
Suppose we're playing a version of chess where you lose if you repeat an earlier position (position = arrangement of pieces + who's move it is). We're down to the wire, and we've just arrived at the ...
- 9,536
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How many times can the same pawn move be made in a game?
How many times in a game can "the same pawn move" be made? By "the same pawn move", I mean, a move made by a pawn that would be notated the same way.
For instance, after 1.e4 e5 2....
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Can White avoid a loss in this endgame study by Lazar?
This is the position with White to move. This was created by Lazar in 1935 according to Susan Polgar in a Chess Daily News article from 5/27/2008.
[FEN "8/3P4/3b4/8/8/1p2k2p/1Pp4P/2K5 w - - 0 1&...
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Can black convert a +5.6 game into a draw (assuming both players play optimally)?
This shows a +5.6 winning for white at depth 33 (Stockfish 13+). White does have a bit of material advantage (knight) and black has more pawn islands. Can black convert this into a draw (assuming both ...
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What is the shortest 1:16 mutual stalemate with the White king at home?
In this ancient r/chess thread, several users explored the shortest possible 1:16 mutual stalemate. StoofBuzze provided a record in 42.5 moves. However, what is the shortest such game in which the ...
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2
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Another mobility puzzle
This is the "opposite" of A mobility puzzle - I held it back because it could have interfered with Schwalbe 2021 construction challenge.
Thus: Put a maximal number m of pieces on the board ...
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In Crazyhouse, what is the minimum number of moves to achieve maximum material difference?
If one side captures everything and promotes all pawns (including the opponent's re-placed pawns) to a queen, it is possible to achieve 206 points of material difference 18 queens, 4 rooks/knights/4 ...
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I have discovered a selfmate requiring 1,351 moves to enforce. How does this move-count stack up against the 'record holder'?
I've discovered a selfmate requiring 1,351 moves to enforce. What is the highest move-count known for a selfmate? {The starting position is provably legal}.
