6

I am still confused about the en passant rule. There are two possibilities that I am not clear about.

[FEN ""]
1. d4 d6 2. d5 c5 3. dxc6 b5 ( 3. c4 e5 4. dxe6) 

Scenario 1 :: The main line above
Is possible to capture en passant again with the white c6-pawn after 3...b5 above?

Scenario 2 :: The side variation above
After 4.dxe6 above, is it possible to capture the black d6-pawn en passant with the white e6-pawn on a later move?

12

En Passant can only be played when the enemy pawn moves over your pawn's capture square during it's first move (moving 2 squares); so the answer to both condition 1 and 2 is no.

It is not possible for a pawn to en passant twice in a row.

My understanding is in early chess pawns could only move one space at a time, so when the 2 move rules was added they also added en passant to counterbalance the fact that you might lose a chance at capturing your opponents pawn since he could now move over your capture square.

So, in essence, because after capturing en passant it is no longer possible for an enemy pawn to pass over your capture square, it is no longer possible for your pawn to capture en passant.

The official FIDE rules, article 1 section 3.7d states:

A pawn attacking a square crossed by an opponent’s pawn which has advanced two squares in one move from its original square may capture this opponent’s pawn as though the latter had been moved only one square. This capture is only legal on the move following this advance and is called an ‘en passant’ capture.

1

A pawn capturing en passant (the d pawn in this case), basically interrupts the passage of the adjacent (c) pawn on his third rank (c6 for you), on the way from c7 to c5. This privilege can be exercised (retroactively) only on the immediately following move.

Once the c pawn has arrived at c5 (without interruption), there is no "second change" for the d pawn to capture him.

1

If, in the original diagram, above, Black's move had been 3. ... b6, White could not have captured it with the pawn on c6. Why would you think that because Black played b5, the c6 pawn could do so? It is simply physically impossible for a given pawn to capture en passant a second time.

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