illegal pawn capture

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stersman

I'm white, my opponent is black. (Not literally, just the game pieces)

White Pawn on A5 captures Black Pawn on B5 but lands on B6. Yes! My Pawn does a horizontal  karate chop capture and boogies north all in one shift seamless move! 

Here's the breakdown. During gameplay... my move, after a brilliant come back I'm perfectly set up for the "stersman attack" which you have never seen unless you have played me. Then something mysterious happens?  Ok Sure, I play at typically the 500 level because I watch re-runs of Dirty Jobs while playing but I know an illegal move when I see one... even if it's out of one eye. This is when the alleged illegal moves happens however my intentions where to take Black Rook sitting at home base with the piece that identifies as a middle aged white women. But before the murder of an innocent Rook I hovered my mouse over my Pawn when it let me do the stersman secret pawn karate chop?

My question is what the heck happened?

1. Hackers?

2. Cosmic Ray Bit-Flip?

3. I'm just damn good. 

My biggest concern is passenger vehicles on roads in the near future will be driving us all around everyday. If we can trust a computer program to move a puzzle piece correctly how the heck can we trust them to navigate traffic and not purposely mow over innocent people standing otherwise safely on B5 st?

R5M8

https://en.wikipedia.org/wiki/En_passant

Isa_aq
There is a special move in chess called ‘en passant’. It is too hard for me to explain, but just know that it isn’t a hack or anything, in fact you can play it yourself.
stersman

I've heard of special moves but I did not know it was in the offensive attack. I had to "Youtube" it to understand it. Explained anyway else is like explaining cold fusion to a Millennial. 

 

Isa_aq

Understandable

BlindThief

"stersman attack"

Got nothing on my blind thievery, in which I point behind my opponent, wait for him to turn around, and then steal a rook. It can even be employed when you’re winning, where you substitute your opponents wallet for his rook.

ChessGambler-2017

En passant. En passing. Named after a ship attack technique where the offensive ship rammed into the side of the enemy ship. Pawns by nature have to always attack or be able to attack the pawn on its side ranks. This rule was created because the first move of a pawn would just ignore the threat of the enemy pawn. 

Skylande

Nah, it is in the rule of chess grin.png