6

I found a problem that perfectly fits your description! [Title "Kurt Keller, Stuttgarter Nachrichten & Südwest Presse (Ulm) 1993, Mate In Three Moves"] [FEN "5RbN/5p1k/5P1P/5PpK/8/8/8/8 w - - 0 1"] 1. fxg6+! {Inore how the replayer leaves the black pawn} fxg6+ (1... Kxh8 2. gxf7 Kh7 3. fxg8=Q#) 2. Nxg6 Bf7 3. Rh8# If the Games ...


5

I made a program that reads PGN files that contain thousands of games. It read 1 317 676 games and found six that fit the criteria. A Bitalzadeh vs E L'Ami, 2013 I Shahaliyev vs E Ghaem Maghami, 2014 M Petrov vs M Ozdover, 2016 Vi Balint vs G Kjartansson, 2017 J Bonin vs M Paragua, 2019 N Berry vs A Roy, 2019 More could be found. I downloaded all the 1.3 ...


4

I found one in 8 moves: [Title "Shortest En Passant Helpmate?"] [fen ""] 1. e4 f6 2. Bb5 Kf7 3. Qe2 Ke6 4. e5 Qe8 5. Qe4 Qf7 6. d4 a6 7. Bf4 d5 8.exd6#


3

Thanks, inspired by Brian's response, I have tried the following input: begi prot outputp.txt piec White Kf5 Qf8 Ph5 Black Kh7 Pg5 stip #1 opti enpa g7g6g5S next piec White Kf5 Pg4 Rf6 Black Kh4 Pf4 stip h#1 opti enpa g2g3g4 end which successfully gives the following outputs: 1.h5*g6 ep. # 1.f4*g3 ep. Rf6-h6 # So I think that's it. Thanks again.


3

The github page lists several help files in various languages: English, French and German. These are text files which can be downloaded. English is clearly not Thomas Maeder's mother tongue, I'm guessing German. Perhaps the German help file is clearer than the English. As far as I can tell from the English file there is a long list of options you can pass ...


3

On a related note, here is a chess problem that demonstrates the weird mechanism of the pawn being pinned by the taken pawn. [Title "Erich Anselm Brunner, Deutsches Wochenschach, Selfmate In 3 Moves"] [FEN "8/8/5Q2/2p3Pk/5R1P/5r2/1PPKB1P1/2NRB3 w - - 0 1"] 1. Ra4 c4 2. Qf7+ Kg4 3. b4 c3# The rook on a4 pins the Black pawn such that it cannot take en ...


2

The best way to think of en passant is that it's a normal move in all regards, except that the opportunity to play it expires on that move. The move can be carried out so long as it doesn't break any rules, just like any other move. So it can be used to block a check, give a check, give a checkmate, etc. But let's say your pawn is pinned to your king. If ...


2

This is an important corner case for programming and also comes up in certain chess problems. I begin explanations by saying that castling and en passant are handled slightly differently, but don’t worry about this. Each is handled in the most sensible way. Ideally one would look ahead in the game to find out whether the moves are actually playable. For en ...


2

Overall the game would be slower and opening attacks would be more aggressive at times at times. The purpose of implementing the double-step was to speed up the game. That way, those pesky pawns wouldn't have to waste so much time, i.e. moves, moving forward to mount an attack or to develop an area of advantage/control. But with the double-step gone, we ...


2

The en passant rule is supposed to minimize the effect of the rule change of the double step. Basically, people thought it was boring to always make two moves that almost deterministically follow each other, because at the time you always sought to occupy the center, so they combined two moves into one. The same also happened with castling. But these two ...


2

I searched through all of the 1 317 676 games in The Week in Chess found two that fit the criteria. H Dang vs D H Nguyen, 2015 P Ponkratov vs V Fedoseev, 2016


1

Here's a game with three consecutive en passants. The catch is that it's a proof game composition, rather than an over the board event. But it's spectacular because there is a completely unique sequence of moves ending with Black's 17th move to reach the diagram. This is the only known sound proof game for this task. Even reaching one en passant is not ...


1

The history of some chess positions can be determined with certainty and some cannot. PRA looks at each alternative history and finds their different solutions. These typically revolve around if the right to castle exist, then you have some solution; or if last move allows en-passant then another solution exists. RS involves 'mutual dependency', for ...


1

You would find more slow openings like the hedgehog in reverse. There would be more fianchettoes and horsies on bishop 3. Then k&q on 2nd rank with a rook moved to middle to let the king slide to the side to be safer when appropriate. Might cause delayed castling and affect choice of side the king runs to.


1

Although not directly answering the question, here is a problem that I recently came across that demonstrates how the right the castle affects caluclating threefold repeition. [Title "Petrović, Nenad, Problem (Zagreb) 1959, 1st Prize, White To Move And Mate In 8"] [FEN "r3k2r/p2p4/p1pP2p1/5pN1/5p2/1Q3p2/PP4b1/KB6 w kq - 0 1"] 1. Qb7 {In ...


1

That is not a checkmate. The opponent is right in taking the offending pawn en passant.


1

Your programming description relies on variable name specific to your program, so it's hard to understand what you're saying, but one way to program this is to to have a "double pawn move" boolean. To makes things simpler, let's assume that white is the one making a double pawn move. To move a pawn two space, white first moves the pawn one space, and set ...


1

Thanks for the question. If an officer could indeed be captured en passant, then one would need to undo any capture it had just made, which is potentially awkward. This doesn't apply to pawns, because the famous double hop is defined to be a non-capturing move.


Only top voted, non community-wiki answers of a minimum length are eligible