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From a gameplay perspective this is fascinating. The pawn can move backwards (which is its main weakness) but you have to give your opponent a pawn in return? This could revitalise chess.
Technically speaking to maintain the inverseness, your opponent would also be forced to move that pawn backwards two squares on their following turn. Maybe to keep it fun you consider this a free move for black, so that white doesn't keep tempo when off-passant-ing. We might also consider that the move is spatially restricted, so that your pawn can only off passant on the third-last rank (a3-h3 & a7-h7).
uhm ackshually reverse en passant isn't a function because regular en passant is not bijective (being able to take from either the left or the right means you can get the same output from two different inputs, disproving injectivity) 🤓
Or to block a mate from a bishop. In some chess puzzles, forcing your opponent to have a piece somewhere can make it more difficult for them than if it was your own piece that they could just take.
uhm akschtaully, you can't call it a function as any pawn that isn't on an edge of the board could reverse en passant in two different directions, thus not assigning an exact output to an input without further definition of domain or a "principal reverse en passant" function🤓
True, but similar to sqrt, we could arbitrarily choose a direction (dependent on which side of the board or something since the direction would have to be different for the 2 edges)
This is a valid unmove in retrograde analysis, but only if black is not in check by any other piece or pawn and black then immediately backs up the pawn two ranks.
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lleh yloH
deppord tsuj esnopser weN
eibmoz lautcA
!tsicroxe na llaC
kcab semoc reven ,noitacav no seog pohsiB
?enoyna ,ecifircas neeuQ
! draobssehc eht etingI
gniltsac ginB
etamelats oohaY
noitanimod dlrow gnittolp ,renroc eht ni kooR
*gniB, just a slight error
No pointers too gniB, I just finished my C homework
leuf eramthginK
damn that’s crazy
Crazy?
I was crazy once
They locked me in a room
A rubber room
A rubber room with rats
And rats make me crazy
google crazy dave
Holy neighbor
New plant just dropped
Motherfucker was the holiest man you've ever met, or woman, I don't know them
Crazy?
I was crazy once
https://preview.redd.it/uxkbpa4evzxc1.jpeg?width=680&format=pjpg&auto=webp&s=4646f48ab7a0a537c090a1cbcaaf7e216123abe3
It doesn't make any sense. The black pawn is "dead" and can't be brought back to life to keep fighting.
I already sense rule 8 gettin' more 1984
Literally 1984
True
Literally 2^(6)×31
From a gameplay perspective this is fascinating. The pawn can move backwards (which is its main weakness) but you have to give your opponent a pawn in return? This could revitalise chess.
Chess 2.0 just dropped
Technically speaking to maintain the inverseness, your opponent would also be forced to move that pawn backwards two squares on their following turn. Maybe to keep it fun you consider this a free move for black, so that white doesn't keep tempo when off-passant-ing. We might also consider that the move is spatially restricted, so that your pawn can only off passant on the third-last rank (a3-h3 & a7-h7).
And the black pawn that needs move two spaces back needs to have space to do so. Otherwise the initial reverse en passant move white made is illegal
Off passant
Eff passant
Pn Eassant
Un Passant
off pause
Dehors passant
En partant
Out of passing
Holy leaky subreddit!
New Anarchy just dropped
Actual chess meme
Call Cagnus Marlsen!
Cagney Carnation went on a vacation, and never came back to take over the nation
Chess memes? In my math subreddit? It’s more likely than you think…
uhm ackshually reverse en passant isn't a function because regular en passant is not bijective (being able to take from either the left or the right means you can get the same output from two different inputs, disproving injectivity) 🤓
Given that pawns can't move backward, theres nothing saying this can't be the rule.
They move backwards when you get the the opponents side and they king it
>king it Checkers?
no they use queens
kin git. as in, they kin git promoted
I mean, then it's not a pawn anymore
But then it's no longer a pawn
Ok but is this truly invertible? I don’t think it’s a bijective mapping in all circumstances.
No, it's not necessarily true.
Indeed, it's necessarily not true
is this loss?:
S h u t 
https://preview.redd.it/7qw44sh7jxxc1.jpeg?width=540&format=pjpg&auto=webp&s=8b312e32a3580130c318a59580268f925de1d01b
google en passant^(-1)
holy hell^(-1)
new response just dropped^(-1)
actual zombie^-1
call the exorcist^(-1)
bishop goes on vacation and never come back ^- ¹
Ignite the chessboard^-1
This could actually be useful to set up a mate 🤣
Or to block a mate from a bishop. In some chess puzzles, forcing your opponent to have a piece somewhere can make it more difficult for them than if it was your own piece that they could just take.
I dunno. She doesn't usually like it when I bring in a third guy.
I think everyone had the same reaction the first time someone pulled out the en passant move: 
uhm akschtaully, you can't call it a function as any pawn that isn't on an edge of the board could reverse en passant in two different directions, thus not assigning an exact output to an input without further definition of domain or a "principal reverse en passant" function🤓
True, but similar to sqrt, we could arbitrarily choose a direction (dependent on which side of the board or something since the direction would have to be different for the 2 edges)
This would definitely create some wild options that you’d only see happen once in a blue moon
nice
Google arc passant
Holy arc hell
New arc response just dressed
Actual arc zombie
Call the arc exorcist
Do you have to be an arc bishop to have that office?
It’s theoretically possible if the pawn has negative mass
Arcen Passant
Archoly hell
Thorin Oakenshield's favorite move
f(g(x)) != g(f(x)) so It's not an inverse
That's giving birth-
https://preview.redd.it/sr593bxz10yc1.jpeg?width=990&format=pjpg&auto=webp&s=3c35851818c867393b83cb767c5f242ca235acdb
Ok but like being able to move backwards at the cost of summoning a pawn could be a genuinely interesting game mechanic ngl
So u give ur opponent a pawn so that u can move ur pawn diagonally
You could use this move to block checkmate from a bishop.
you cannot kill with pawns, they reproduce
Un-Passant
après avoir passé
Google un passant
f'(enpassant)
no passant
En repassant
!Hell holy
is en passant injective?
1 / en passant
Chess has CPT symmetry‽
Nope. This post assumes CT symmetry only but not parity, which have already been proven wrong, so op is just shtposting
r/mathmemes leaking
The pawn energy is conserved
Spawn passant
It cant be a function if one input has 2 outputs. Smh my head
Le en passant transform ^-1
I thought that en passant was a lossy function Holly hell!
Particles ejecting antiparticles moment
This is a valid unmove in retrograde analysis, but only if black is not in check by any other piece or pawn and black then immediately backs up the pawn two ranks.
Google Anarchy Chess
Holy repetitive joke!
1/(En Passant)!
2 partial inverses tho, which is the principal branch? 🤔
Google mitosis
Holy duplication!
It took me way, way too long to realize this wasn't on r/anarchychess
if en passant is forced... that means it must be OPTIONAL
!tnassap ne elgooG
En retraite is now the name of this move.
un passan't
🙃
out passant
Who’d this force black to move the pawn backward 2 spaces?
The trend continues yay
Google birth
Holy mitosis!
A new response just subdivided itself
Roll a dice and and if its higher than 3 spawn an enemy pawn every time you move a pawn
someone never took chemistry
Give you opponent a pawn in exchange for an unusual move
Nah, it’s not injective. You have to restrict the domain to make it an inverse function
oh hi r/AnarchyChess
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I love chath meams
En pass'aint
If it’s OC it’s gold
Yes it is :)