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56

This sort of thing is what the Preface of the Laws of Chess is for: PREFACE The Laws of Chess cannot cover all possible situations that may arise during a game, nor can they regulate all administrative questions. Where cases are not precisely regulated by an Article of the Laws, it should be possible to reach a correct decision by studying ...


51

As the old poem says: For want of a nail the shoe was lost. For want of a shoe the horse was lost. For want of a horse the rider was lost. For want of the rider the message was lost. For want of a message the battle was lost. For want of a battle the kingdom was lost. And all for the want of a horseshoe nail. Exactly the same principle applies in ...


33

One amazing game I know that ends in a pawn mate in one called The Polish Immortal in which Black sacrifices all four minor pieces to win the game! The pawn does a double-step to give the mate. [Title "Glucksberg-Miguel Najdorf, Warsaw Poland, 1929, The Polish Immortal"] [FEN ""] 1.d4 f5 2.c4 Nf6 3.Nc3 e6 4.Nf3 d5 5.e3 c6 6.Bd3 Bd6 7.O-O ...


33

I'm not at all disagreeing with the existing answers - both sound. Indeed every pawn is a potential queen. However, one aspect of the question remaining is: why struggle for a pawn as opposed to a more decisive plan? In the games that you are watching, if they are between capable and well-matched players, very often the game will be quite well balanced with ...


27

You were playing the chess variant called Crazyhouse. In this variant you can place pieces you captured, as one of your color anywhere on the board, instead of a normal move. I don't know the software you are using, but on Lichess the variant can be selected in the "Create a game" dialog. There should be something similar in your application.


26

The simple and obvious answer is that it all depends on the position of black's pawns and king. In general the further up the board the pawns the better for black provided the king is in contact with the pawns, preferably in front of them. Worth pointing out that the position you give is winning for white because the pawns aren't far enough forward. From ...


23

It's probably a trick problem with a promotion to a black knight. Such promotions to the wrong colour are not allowed, and never were. In the official rules it is now specifically pointed out that the new piece has to have the same colour as the promoted pawn. FIDE's laws of chess, Article 3.7 e: When a pawn reaches the rank furthest from its starting ...


23

From FIDE rules (3.7 e): When a pawn reaches the rank furthest from its starting position it must be exchanged as part of the same move on the same square for a new queen, rook, bishop or knight of the same colour. The player’s choice is not restricted to pieces that have been captured previously. This exchange of a pawn for another piece is called ‘...


23

As @BrianTowers showed, it can be done. Here’s a shorter proof game for the fun of it. [FEN ""] 1. h4 g5 2. hxg5 f5 3. g4 Nf6 4. gxf6 d6 5. gxf5 Be6 6. f4 Bb3 7. axb3 c5 8. e4 c4 9. bxc4 d5 10. cxd5 e6 11. dxe6 Na6 12. b4 Nc5 13. bxc5 Qd5 14. c4 Bd6 15. cxd6 Rf8 16. cxd5 Rh8 17. d4


23

Absolutely not. Making stalemate a win would be a sure way to make for less interesting chess. Any rule change which makes it easier to convert a small material advantage to a win, will ipso facto make it less attractive to sacrifice material for attacking chances. One of the things that makes gambits playable is the fact that, if the attack fails, the ...


22

4 moves, as far as I can tell. [FEN ""] 1. e3 e5 2. Ke2 Qh4 3. Kf3 d6 4. Qe2 e4# Another one: [FEN ""] 1. d3 d5 2. Kd2 e5 3. Kc3 Be6 4. Qd2 d4# And one more: [FEN ""] 1. e3 e5 2. Ke2 d5 3. Kd3 Qf6 4. Qe2 e4# Same theme for all of them, really.


20

There is no loophole. Rules 3.7.1 to 3.7.4 allow pawns to move forwards along the same file, or diagonally forwards onto an adjacent file. The only argument here seems to be that "forwards" is not explicitly defined but it is implicitly defined by 3.7.5.1 which beings with the following quote: "When a player, having the move, plays a pawn to the rank ...


20

Here is one simple solution: [fen ""] 1.c4 d5 2.cxd5 e6 3.dxe6 f6 4.g4 g6 5.g5 Ne7 6.gxf6 Nd5 7.e4 Nc3 8.bxc3 Qd4 9.cxd4 b5 10.d5 b4 11.a3 c6 12.axb4 c5 13.bxc5 Bd6 14.cxd6 g5 15.h3 g4 16.hxg4 Rg8 17.f3 Rg5 18.f4 Rf5 19.gxf5 Na6 20.d4 More moves can be added to reach the exact position with no other pieces other than kings.


20

The problem with 7... dxc3 is that White quickly regains both pawns. r1bqk1nr/pppp1ppp/2n5/2b5/2BpP3/2P2N2/P4PPP/RNBQ1RK1 b KQkq - 1 7 [StartFlipped "0"] 7... dxc3 8. Bxf7 Kxf7 9. Qd5 Kf8 10. Qxc5 d6 11. Qxc3 {+/- Sokolsky, ECO C}


18

Chess strategy is complex and has several ingredients mingling at the same time. It is true that 3 c3 helps white mantaining two center pawns if black decides for a c:d4 pawn exchange. But black isn't forced to that and the move c3 has some incovenients. To list just two: blocks the c3 square which is the natural place for developing the Q-side knight; ...


17

As White's previous move was pawn on h2 to h4 then pawn g4xh3 is a legal en passant capture. For more info - see Rule 3.7.d of the laws of chess


17

White intends to play c5, which will gain space on the queenside and severely cramp black's position (The b6 knight has no good square). On the other hand, e5 weakens white's control over d5 and f5 (e.g. Black can then go ...Ne7-f5). Black could also take advantage of the weak c4 and d5 squares with ...Na5 and ...Bc6. Keeping the pawn on e4 seems better. ...


16

EDIT: record is now 20.0 moves! (See below.) If we like pawns undoubled... [title "16 non-doubled passed pawns in 21.0 moves"] [fen ""] [startply "42"] 1. g4 h5 2. g5 Rh6 3. gxh6 g5 4. h4 g4 5. b4 e5 6. f4 e4 7. Nf3 exf3 8. e4 f5 9. e5 Qg5 10. Nc3 a5 11. Ne4 fxe4 12. c4 a4 13. Qb3 axb3 14. a4 b5 15. a5 d5 16. c5 Bd6 17. cxd6 c5 18. Ra4 c4 19. d4 Na6 20. ...


15

I believe the en passant rule is designed to cope with the fact that pawns do not move backwards, hence if the en passant rule did not exists you could have a lot of blocked positions, making play slower and probably more drawish. Differently from pawns, pieces can move backwards, so the black Knight in your example still has the possibility to move ...


15

I disagree that it is primarily about development. This is a very common theme, and it comes down to the fact that e5 is not easily defended by a pawn (aka "artificially isolated"). Bg4 soon will trade one of the pe5's defenders, and it will need constant watching. It is not a big deal that you will be trading the Bc8 on f3 since white already traded on c6 ...


15

You've given some good, very long-term reasons not to play e5. But in this position, dynamic considerations outweigh these long-term reasons. Look again at the position: you have developed (if you have not encountered this term before, it means moving your pieces from their starting squares so they can participate in the game) two knights, a bishop, and ...


15

Start with whatever and tune it. That's how chess engine programming works - you start with some number, and then tune it. For example you start with -5, then create another version with -10. You get the two engines to play against each other, and the one that wins more often is the "correct" version that you keep. Of course as pointed out by other ...


15

The game would definitely become way less interesting, as many endgames that offer a chance to keep fighting would become hopeless. There would be more games that end in a win (so yes, more decisive games), but not necessarely more attacks, as those hardly ever end in a stalemate. It's hard to make a valid prediction without trying it out, but it's ...


14

This is a good question, as much as some may be instinctively frustrated by it, because finding room for improvement in rulesets is useful and can prevent future issues where arbitration is required. My understanding is that "front" is defined by the piece's colour, not it's rotational orientation. This is consistent with the definition of "last rank" in ...


13

The question is extremely open, as these pawns may be moved for many reasons depending on the position you are facing. In a general sketch, you may consider five kind of a and h pawn moves: To create some luft for the king, that is, avoid once and for all the back rank threats. [FEN "r5k1/5ppp/8/8/8/8/5PPP/1R4K1 w - - 0 1"] In this position, neither rook ...


13

e5 does nothing for you and helps your opponent. Why? First, it does nothing for your development. Much better would be d3 which releases the c1 bishop and protects the e pawn. If your opponent plays de then you retake de and he is left with doubled isolated pawns on the c file and an isolated pawn on the a file. If he doesn't then exchange queens he also ...


13

No matter how a chess piece is shaped, FIDE rules do not define "front" or any other direction relative to the orientation of the piece. Chess pieces do not have a front, rear, direction of advance, and so forth. Only the board has these.


13

There are already many good answers here that address your question from a hypothetical point of view. I want to add to this discussion some empirical data coming from AI chess, based on the arXiv preprint Assessing Game Balance with AlphaZero: Exploring Alternative Rule Sets in Chess (2020) by Nenad Tomašev, Ulrich Paquet, Demis Hassabis and Vladimir ...


12

I would love to see the position; please add it to your question somehow (we can always edit it to look nice). However, there is no such rule. Either your computer doesn't implement captures en passant (improbable these days) or the capture was not valid for some other reason.


12

This is too complex to have straight principles. Of course there are some patterns that you are going to recognize during your improvement and there are also easy things. I'm going to mention a few at the end of this post. First of all, let me refer to positions cited by you. Position #1 Key is calculating, always, and this is great example. First thing you ...


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