EN Passantはチェスの特別な動きであり、ポーンが最初の2つの正方形の前進をしたばかりの敵のポーンを捕らえることができます。ただし、制限があります。Passantを実行するには、2つの正方形の前進を行った後、Opentonのポーンを自分のポーンでキャプチャする必要があります。このルールの主な目的は、プレーヤーが2つの正方形の前進を使用して、対戦相手のポーンを通り過ぎるのを防ぐことです。EN PASSANTは、チェス表記で「E.P.``」で記載されています。

これは、en passantの例です。
`` `
1. E4 E5
2. NF3 NF6
3. D4 exd4
4. E5 NE4
5. QXD4 D5（図を参照）
6. EXD6 E.P
`` `


これが実行されているENパッシャントのグラフィック表現です。
`` `
--- 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]
`` `
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]
```