Was im Schach en passant ist
En passant is a special move in chess that lets a pawn capture an enemy pawn that has just made an initial two square advance. There is a restriction though: to perform en passant you must capture your oponent's pawn with your own right after they do the two square advance. The main purpose of this rule is to stop a player from using the two square advance to skip past an opponent's pawn. En passant is notated with ```e.p.``` in chess notation.

Here is an example of en passant:
```
1. e4 e5
2. Nf3 Nf6
3. d4 exd4
4. e5 Ne4
5. Qxd4 d5 (see diagram)
6. exd6 e.p
```


Here is a graphic representation of en passant being performed:
```
---a--b--c--d--e--f--g--h--
8-[x][x][x][x][x][x][x][x]
7-[x][ ][x][x][x][x][x][x]
6-[ ][ ][ ][ ][ ][ ][ ][ ]
5-[ ][ ][ ][ ][ ][ ][ ][ ]
4-[ ][x][ ][ ][ ][ ][ ][ ]
3-[ ][ ][ ][ ][ ][ ][ ][ ]
2-[o][o][o][o][o][o][o][o]
1-[o][o][o][o][o][o][o][o]


---a--b--c--d--e--f--g--h--
8-[x][x][x][x][x][x][x][x]
7-[x][ ][x][x][x][x][x][x]
6-[ ][ ][ ][ ][ ][ ][ ][ ]
5-[ ][ ][ ][ ][ ][ ][ ][ ]
4-[ ][x][o][ ][ ][ ][ ][ ]
3-[ ][ ][ ][ ][ ][ ][ ][ ]
2-[o][o][ ][o][o][o][o][o]
1-[o][o][o][o][o][o][o][o]


---a--b--c--d--e--f--g--h--
8-[x][x][x][x][x][x][x][x]
7-[x][ ][x][x][x][x][x][x]
6-[ ][ ][ ][ ][ ][ ][ ][ ]
5-[ ][ ][ ][ ][ ][ ][ ][ ]
4-[ ][ ][ ][ ][ ][ ][ ][ ]
3-[ ][ ][x][ ][ ][ ][ ][ ]
2-[o][o][ ][o][o][o][o][o]
1-[o][o][o][o][o][o][o][o]
```