25

So I grab a rook instead. Did I break a rule? No, the FIDE Laws of Chess are very clear. The choice of piece is not decided until it touches the promotion square. In so far as touch move applies to promotion the key is that the promotion must be performed with one hand. That is the same hand must be used to remove the pawn from the board (it does not have ...


22

Under USCF rule 8F7:, it is acceptable to place a rook upside-down if a spare queen is not available. If the desired piece is not available to replace a promoted pawn, the player may stop both clocks in order to locate that piece and place it on the board. A player who cannot quickly find such a piece may request the assistance of the director. It is common ...


19

I suppose what is comes down to is that the way 3.8.2 is written can be argued to have a syntactic ambiguity. 3.8.2 can mean either "This is a move of the king, and either rook of the same colour, along the player’s first rank," or "This is a move of the king and either rook of the same colour along the player’s first rank." There's no ...


17

You pause the clock, call an arbiter and an additional queen will be provided.


16

Is there any glaring flaw in this rules lawyer case, or is it solid until FIDE fixes it? Yes, there is a glaring flaw in your case. The rook and king have to be on the same rank. This is clear from the text of the rule and the diagrams which follow. Here is the text from the latest FIDE Laws of Chess: 3.8.2 by ‘castling’. This is a move of the king and ...


10

Well, according to [Syzygy endgame tablebases](https://syzygy-tables.info/?fen=8/3k2PB/q7/8/4K3/8/8/8_w_-_-_0_1_, g8=R is a loss in 63 plies and g8=Q is a draw. So g8=Q is definitely better.


9

There are numerous chess problems, whether a checkmating one or an endgame study, that feature certain promotions as a necessity to win. Stalemate is the long-known reason behind doing so. Here is a small sampling. This problem is the first known one to use Bishop promotion, although it is a later correction. Even better it comes with double the fun! [Titler ...


8

If anything, promoting to a queen is the better choice, as it forces Black to exchange their rook. For promoting to a rook, Stockfish NNUE actually slightly prefers moving the f5-rook away instead of playing ...Rxf8 (although any continuation gives White a large winning advantage). So at the very least Black is given a choice. But even if we were certain it'...


8

It's easy to come up with positions where promoting to knight leads to insufficient material but promoting to bishop doesn't. This one, for instance: [FEN "N5q1/7P/8/8/8/7K/8/7k w - - 0 1"]


8

There's no reason why the rook promotion is better. Don't listen to engines in positions where there's such a big imbalance


6

Yes the characterization is correct, and there are 58,084,310 legal collections in total. To make headway, we need the right level of discourse, avoiding loss of accuracy while avoiding diving into trivialities. Necessity & sufficiency of the deletion moves Two kinds of operation were suggested to be necessary & sufficient to reach all legal ...


6

The first thing to note is that even if the opponent is deliberately hiding your captured queen (or any other piece you might want to promote to) there is no excuse for using some substitute because the rules allow for a simple solution: stop the clock, call the arbiter and ask for the piece you require. It is part of the arbiter's job to do this. Holding a ...


6

No. The whole point of the game, the way you win, is by checkmating the opponent's king. If your opponent could exchange the king for another piece then you would no longer be able to win. In any case, all the pieces except the pawns can move backwards. Without promotion any pawn which reached the 8th rank and couldn't promote would no longer be able to move....


5

Here are the percentages for each promotion type according to different sources: |Promotion type | ChessBase | TWIC | ICCF | -------------------------------------------- | Queen | 96.9 | 97.3 | 96.1 | | Rook | 1.1 | 1.1 | 1.7 | | Knight | 1.8 | 1.3 | 1.7 | | Bishop | 0.2 | 0.3 | 0.5 | Details: ...


5

In this case, g8=Q is certainly better, since it makes black have to struggle for the draw, and g8=R would make white struggle for the draw.


5

Since the board is mirrored, the pawn is on b7 and the rook on a8. But b7xa8 promoting to a piece is a valid move. I'm not sure which program/website this is, but it could be that a popup is asking to which piece White wants to promote, and something/your browser is blocking this popup, and your friend cannot complete the move.


4

First I wonder what is the most economical presentation of bishop underpromotion. [FEN "5n2/6Pk/4N3/7K/8/8/8/8 w - - 0 1"] White to play and win It's mate in 6 (with a dual) gxf8=B! Kh8 2.Kh6(Kg6) Kg8 3. g6 Kh8 4. Kf7 Kh7 5. Sg5+ Kh8 6. Bg7# Here's the only one in PDB or WinChloe with less than 6 pieces. Are knights more economical than bishops?...


4

Black plays from 7th and 8th rank, his king starting from e8, so the white pawn is on b7. There is no (FIDE) rule that forbids a combination of taking and promotion. b7xa8D (or whatever) is a legal move. When playing online at some minor platform, you will often find that the rules of chess are badly implemented. I know of no single platform that plays ...


4

Found a Rubinstein game! [fen ""] [Date "1908.??.??"] [White "Alapin, Simon"] [Black "Rubinstein, Akiba"] [WhiteElo "2500"] [BlackElo "2640"] [Result "0-1"] 1.e4 e5 2.Ne2 Nf6 3.f4 Nxe4 4.d3 Nc5 5.fxe5 d5 6.d4 Ne6 7.Nf4 c5 8.Nc3 cxd4 9.Ncxd5 Nc6 10.Bd2 Nxf4 11.Nxf4 Nxe5 12.Bb5+ Bd7 13.Qe2 ...


3

For an engine, it makes no difference if you promote to a rook or a queen. In both cases, your advantage is huge. There is no real resistance for black, but his best chances, if any, are to give his rook for the promoted piece. 3.f8R Rxf8 and 3.f8Q Rxf8 result in the same position. No difference. But chess puzzles have their own etiquette. And one of the ...


3

It seems as if the puzzle is based on an actual game played between Jorden van Foreest and Martin Petrov in April 2019. If you click on the button to show the solution, it shows the full game, of which the puzzle is but a fragment. It looks to me as they want you to solve the puzzle by following the game as played, not by coming up with another solution. The ...


2

Set aside the particular example you use, and instead assume that we have found some state where two moves are strictly equal under optimal play. Why would you favor one over the other? Let's focus on endgames, since that's the simplest. The answer, as pointed out by various comments, hinges on the fact that unless you're a masochist playing against a ...


2

The move is legal. If it were blacks move the computer would block it. If White were in check the computer would too. LIke @Glorfindel said the popup probably asked for which piece so blocking it stopped the move. But in that case you should still not have been able to push straight instead of capturing. Do tell us what program/website that was! I do not ...


2

Chess engines prefer to checkmate you as soon as they can, and if they can checkmate you in 10 moves, they look if they can also checkmate you in 9 moves. That's also why chess.com thinks rook promotion is better, because it saw a sooner mate. But if you see a mate in 3 and don't see the mate in 1, just play the mate in 3


2

Due to prior knowledge, I scoured these three chessgames.com collections that I knew of. I found two games that match. They do fit the bill of having the promoted knight protecting a rook. However, they're quite longer than 20 moves, are in the endgame, and have different material balances from what you think. It does help that they are recent games, ...


1

Most over the board sets come with 4 queens total (2 of each color) for exactly this situation. It's quite likely that at some point in your games, you'll need to have 2 queens on the board simultaneously, so they give you the main queen and a spare. If you really need more than 4 queens, you can always "steal" another piece from your neighbors' ...


1

It is a quirk/bug of the software used by that site to pick moves expected in puzzles.


1

I'm not sure about a world championship game, but genuine underpromotions do occur now and then in grandmaster games. For a starting shot, here is the famous 2012 game with a knight promotion by Hikaru Nakamura. According to the FIDE rating website, Nakamura's rating at the time was 2783 the month game was played. By "highest level," I took that to ...


1

A more comprehensive list of endgames sorted by the number of moves it could take to mate (based on Nalimov tablebases) is at http://kirill-kryukov.com/chess/longest-checkmates/longest-checkmates-sorted-by-length.shtml These vary in length from 1 move to 262 moves. It does not include the mate in 549 because that endgame has 7 pieces on the board and the ...


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