Neither player can checkmate the opponent’s king with any series of legal moves.

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### Open problems in chess involving maximum material imbalances

I am posting the present question since here Very unbalanced Chess Positions I have introduced three open problems (i.e., the third one, the fourth one, and the sixth one from the above), regarding ...
3k views

### Maximum number of pieces on board in dead position

It is possible in a chess game to have a dead position in which both players have all eight pawns, one bishop, and a king--20 pieces total. If the two players' pawns are interlocked in "zig-zag" ...
202 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 ...
3k views

### Does 'dead position' consider the 75 moves rule?

In 5.2.2 of the FIDE laws it says: The game is drawn when a position has arisen in which neither player can checkmate the opponent’s king with any series of legal moves. The game is said to end in a ‘...
131 views

### How would I detect dead position in a tablebase?

I am programming a tablebase for fairy chess, and would like to conclude the game if mate cannot be reached in any way. I guess this has to be detected when the evaluation (win in... / loss in... / ...
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### Is the dead position problem solvable?

In chess, there are some dead positions (FIDE Laws of Chess). 5.2.2 The game is drawn when a position has arisen in which neither player can checkmate the opponent’s king with any series of legal ...
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### When checkmate is impossible in a position

The laws of chess say 1.5. If the position is such that neither player can possibly checkmate the opponent’s king, the game is drawn (see Article 5.2.2). 5.2.2. The game is drawn when a position has ...
179 views

### What is "mating potential" in the FIDE Arbiter's Manual meant to mean?

While researching an answer for another SE.chess question (Has a position being a draw under FIDE 5.2.b before a forced recapture ever come up in a tournament?), I stumbled across the following issue. ...
163 views

### Has a position being a draw under FIDE 5.2.b before a forced recapture ever come up in a tournament?

Tom7 points out that FIDE article 5.2.b reads: The game is drawn when a position has arisen in which neither player can checkmate the opponent’s king with any series of legal moves. The game is said ...
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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 ...
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### Longest "death certificate"

Give a legal position which is "dead" but would take (assuming the §5.2.2 about dead positions wouldn't exist) maximally long to play out until an automatic draw by fivefold, 75 moves or ...
2k views

### What will happen if you have a position where no one can lose?

What will happen if you have a position where no one can lose? [fen "5k2/8/1p1p1p2/pBpP1Pp1/P1PpK1P1/1P1Pb3/8/8 b - - 0 1"] Here is my game, I know it is live960 but I was wondering the ...
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### Why does this game not end as a draw by insufficient material?

I played an online game at chess.com and here is the endgame: [fen "8/8/1p2p2k/pP2P1p1/P1K3P1/8/8/8 b - - 0 1"] After white's last move a4, I thought the game ends immediately as a draw by ...
56k views

### What happens after two kings stay on the board?

A lot of times my sibling and I have played chess and have ended up with just two kings. We have never known what would happen next. Two kings on the board would somehow result in an infinite game, as ...
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### A question about draw detection in chess engines

Let us look at this position. [FEN "4k3/8/8/p1p1p1p1/P1P1P1P1/8/8/4K3 w - - 0 1"] This is obviously a draw. Analyzing this with the Stockfish engine says that it is a balanced position. ...
2k views

### How long can a player hold off a draw by the 50-move rule?

Going by rules strictly about the board state, how long can a player theoretically hold off a draw by the 50-move rule? White will play as long as possible, and not want to lose. Black will claim a ...
12k views

### What is sufficient mating material?

The FIDE chess rules describe that "The game is draw when a position is reached from which a checkmate cannot occur by any possible series of legal moves" (FIDE rule 9.6). This rules is sometimes ...
96 views

### A position in which there is no possible checkmate [duplicate]

I saw the game Firouzja vs Carlsen in world blitz championship in which Carlsen flagged Firouzja. Carlsen won because even though he had only a bishop, there could be a possible mate position. I am ...