Use of conditionals

[analyst]

Hello Alan ,

I am little confused between the use of conditionals as follows :

1.This would not have been possible had I stayed at my job and not failed at my first company.

2.This would not have been possible if I stayed at my job and not failed at my first company.

Please explain which one is correct to use.

Thanks.

[Alan]

The first.

An unreal past situation is expressed by the past perfect, not the simple past tense.