[Retros] En Passant Chess

joose norri joose_norri at hotmail.com
Wed Mar 21 09:12:11 EDT 2007

David Bronstein proposed to extend the en passant capture of pawns, to give
the right for pieces too. E.g. 1. d4 h5 2. Bxh6. See The Sorcerers
Apprentice, Fürstenberg & Bronstein.

Joose Norri

>From: <peufe at tin.it>

>Reply-To: The Retrograde Analysis Mailing List <retros at janko.at>

>To: <retros at janko.at>

>Subject: Re: [Retros] En Passant Chess

>Date: Tue, 20 Mar 2007 20:46:49 +0100



>>Date: Mon, 19 Mar 2007 15:48:28 -0400 (EDT)

>>From: Noam Elkies <elkies at math.harvard.edu>

>>Subject: Re: [Retros] En Passant Chess

>>To: peufe at tin.it, retros at janko.at

>>Message-ID: <200703191948.l2JJmSH21123 at abel.math.harvard.edu>


>>>I would share with you all my idea about a variant chess I invented.

>>>[...] I call it:" En Passant Chess ".They are like normal chess,

>>>except that all pieces (King too) and pawns are allowed to capture

>>>(next move) an enemy piece, just moved, which traversed a square

>>>under its control.



>>>1 e4,e5 ; 2 Bc4, Bc5 ; 3 Qf3, Nc6 4 Qxf7 isn't mate because:

>>>4...,e5xQf4 or 4...,g7xQf6 or 4....,NxQf6

>>>or 4....,QxQf6 and if 4 Bxf7? then 4...d7xBe6.




>>Interesting. This could be nice for non-retro fairy problems too.


>>If the piece being captured just made a capture itself, is the captured

>>piece restored? If so, can 4 Bxf7+ be answered also by 4...Kxf7,

>>and then if 5 Qxf7 then (say) NxQf6 restoring the Kf7?


>>--Noam D. Elkies


>Hi Noam, thank you for your idea of restoring captured pieces.

>It makes En Passant Chess more interesting and complex.

>In order to decide if we can allow to restore pieces we must give

>practical meaning to "captures" in Chess.

>In normal Chess we can think that every piece has a "steel weapon", so it


>"kill" the enemy only reaching its square.


>In En Passant Chess every piece has also a long range laser it can activate

>along his

>line of action when it sees an enemy piece moving, so the enemy piece could


>wounded when it arrive in the square where is the piece it captures using

>its steel weapon,

>but the piece captured can't be restored because it was "killed".


>In your variant of En Passant Chess allowing restoring of captured pieces,

>we could think of pieces just like billiard balls.Whenever a ball is moving

>toward an

>enemy ball to knock it, another enemy ball starts to move in order to knock

>it before,

>stopping its journey, so the "captured " piece can be restored.

>What do you like to choose?


>What about multiple captures? They are really crazy.....

>As example:



>En Passant Chess: 1.RxRg1, QxRf1 2. RxQf4, BxRg4 3. BxBd7


>En Passant Chess( Restored pieces): 1. RxRg1, QxRf1-restore rg1

>2.RxQf4- restore Rg1, BxRg4-restore qf1 and rg1 3. BxBd7- restore Rf4, Rg1

>and remove qf1.


>Too funny or too fuzzy?

>Could we imagine situations that could make possible cyclic paradoxical


>All this makes me think to Time-Travel paradoxes.......


>bye, Franco



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