Glorfindel
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Can you solve this unique chess problem of white's two queens vs black's six rooks?
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70 votes

It's checkmate in 20 moves. White's queens circle around the board giving checks, and Black interposes horizontally/vertically moving pieces. Black only has one choice because the other piece is ...

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When en passant is the only legal move
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46 votes

You are right, this is nonsense. From the FIDE laws of chess, article 5: The game is drawn when the player to move has no legal move and his king is not in check. The game is said to end in ‘...

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What is the fastest way to reach stalemate?
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38 votes

Sam Loyd, a famous puzzle composer, created this 10 move, 19 ply, stalemate game over 100 years ago. I found it via Google, in this post by AndersElborg on chess.com. Most black pieces are blocked, ...

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Why does the engine tell me to sacrifice a queen for bishop after a failed Scholar's mate?
37 votes

As @Ibrahim explains, you'll win the queen back, but after that White can even take the pawn on f7: [FEN ""] [StartPly "10"] 1. e4 e5 2. Qf3 c6 3. Bxc4 Nf6 4. d3 d6 5. Bg5 Bg4 6. ...

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How many chess players are over 2500 Elo?
34 votes

The website 2700chess.com has a database with the FIDE ratings (from May 1st, 2019). Their search form only offers the option to show the top 50 or 100 players satisfying the search results, but it's ...

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Are there any illegal positions that are difficult to spot?
33 votes

Yes - the less a position looks like a real chess game, the harder it is to spot if it is illegal or not. Sometimes, retrograde analysis is needed to prove a position can be reached in a legal way. ...

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Can a player resign after checkmating their opponent?
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33 votes

No, this is not possible. for example move the piece, don't press the clock and then resign? In particular, that loophole is explicitly covered by the rules: 6.2.1 During the game each player, ...

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Wrongly placed chessboard - what happens?
32 votes

It's wrong because the rules say so: 2.1 The chessboard is composed of an 8 x 8 grid of 64 equal squares alternately light (the ‘white’ squares) and dark (the ‘black’ squares). The chessboard is ...

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Does a KQQ vs KQ endgame position with perpetual check exist?
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31 votes

The position given by Akavall is indeed a draw by perpetual, but it's a bit difficult to see because White has many different options at some moves. They can even choose to sacrifice the h2 queen, ...

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What is the solution to this mate in 2 puzzle?
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29 votes

It is a nice little puzzle: 3k4/3P4/3Q4/8/8/8/8/4K3 w - - 3 13 1. Qd5 Kc7/Ke7 2. d8=Q# 1-0

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Is it sportsmanlike to waste opponents' time by giving check at the end of the game?
25 votes

waste their time If it's clear that they are able to win within the time they have left, this could be considered bad sportsmanship. However, in those situations the number of remaining checks is ...

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Is acceptable to consult with your team during a match break?
24 votes

I haven't seen the series, but this was a quite common practice known as adjournment. It is indeed legal to ask for outside help, in the form of teammates and even computer programs during adjournment....

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When does a chess clock start?
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23 votes

According to the FIDE rules, 6.6 At the time determined for the start of the game White’s clock is started. In over the board chess, it's usually Black who does this (you can't have an arbiter ...

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Why is the engine suggesting this move?
Accepted answer
22 votes

Black would like to continue their development with Nf6 and castling short. g4 discourages Nf6; after g5, the knight is forced back. It also prepares Bg2, which protects d5 without giving up the pin ...

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Least number of moves to achieve a complete switchover of nonpawns in starting setup
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21 votes

As @chakerian's calculations show, 40 moves is the minimum. After a bit of puzzling, I found the solution. [FEN ""] 1. a4 {First, we need to get the rooks in position. They'll be hard to ...

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Chess960 or Chess959?
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21 votes

There is no mention of excluding the regular starting position in Appendix F. of the FIDE Laws of Chess, so it's really Chess960 and not Chess959. I can imagine that there are chess programs or ...

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Is preventing an opponent from castling considered an advantage?
21 votes

It'll depend on the rest of the position. If it's relatively open, chances are you can keep the opponent's king in the center and launch an attack. This might well be a decisive advantage; preventing ...

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How do chess engines decide which best line to play when the game outcome is within their horizon?
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20 votes

If the engine can choose between getting mated in 2 or mated in 3, it'll choose the line where it is mated in 3 (even though the mate in 2 might be 'more difficult' to spot for humans). It can't ...

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When is it legal to castle moving the rook first?
20 votes

Unless this is a trick question, I'd say never: 3.8.2 [] This is a move of the king and either rook of the same colour along the player’s first rank, counting as a single move of the king and ...

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Are there any gambits involving sacrificing a piece?
20 votes

The 'Halloween Gambit' or 'Müller-Schulze Gambit' is a knight gambit in the (often characterized as dull) Four Knights Game: [FEN ""] [White "Blokje"] [Black "Platypussy"] [StartPly "7"] 1. e4 e5 2. ...

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What would you do in this situation?
Accepted answer
19 votes

Black's queen is the only defender for the mate on f7 (the knight on e5 is pinned). This makes Bxg5 a very attractive move, as the black queen has nowhere to go (the only safe spot, Qf8, is met with ...

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Are there rules for categorising all pawn-only endgames into won/drawn/lost?
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18 votes

Generally speaking, the side with the most pawns will win. The tempo provided by the extra pawn is usually enough to gain opposition and access to the key squares. Doubled pawns don't matter for this, ...

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How useful is a 40-year-old chess book?
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17 votes

This depends on a lot of things, but most importantly: your playing level and the topic. For example, if it is an opening book, it heavily depends on the opening. Some opening variations which are ...

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Can it be useful for a player block with a hanging piece in a back rank mate situation?
17 votes

[FEN "R5k1/5ppp/8/2r5/1b6/8/5PPP/6K1 b - - 0 1"] 1... Rc8 2. Rxc8+ Bf8 This is an example of what Tim Krabbé calls an 'unguarded guard' - a linepiece checks, and a piece interposes on an unguarded ...

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How are the scores decided in Chess?
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17 votes

Those aren't scores; there are just three possible scores in chess: White wins, Black wins, and draw. Those are evaluations of the chess engine; a score of +0.62 means the engine thinks White's ...

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Can you solve this chess problem of king and pawn against all opposing pieces?
16 votes

First, Then Meanwhile [FEN "8/8/8/2p5/1pp5/brpp4/qpprpK1P/1nkbn3 w - - 0 1"] 1. Kxe1 Qa1 2. h4 Qa2 3. h5 Qa1 4. h6 Qa2 5. h7 Qa1 6. h8=N Qa2 7. Ng6 Qa1 8. Ne5 Qa2 9. Nxc4 Qa1 10. Na5 c4 ...

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Why aren't early opening moves generally given exclamation marks?
16 votes

Wikipedia says the following: Exclamation points ("!") indicate good moves—especially ones which are surprising or involve particular skill. Hence annotators are usually somewhat ...

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Why is it allowed to request an increment in time trouble?
Accepted answer
15 votes

but that will not affect the game due to his/her hopeless position Well, if your opponent has a hopeless position, they would be better off accepting the 'automatic' draw offer which is implied ...

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Chesscademy Tactic: Is my alternative as good as the right answer?
Accepted answer
15 votes

The problem is that 5. Qxh5 isn't check, so Black has time for some back rank tricks (instead of capturing the rook on f6): [FEN "r1r4k/1p5R/3b4/4q3/B3P1Q1/1n1P3P/6P1/5R1K b - - 0 1"] 1... Kxh7 2. ...

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Two Rooks vs Queen endgame
14 votes

Generally speaking, it's a draw. Most pawnless endgames are drawn, unless one side has a material advantage of more than a minor piece. Either side can win if there are short-term tactics. To check ...

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