Past Unreal Conditional


After my first question was answered so beautifully, I would like to ask some
more. :D

I wanted to know how to use conditionals for events in the past, like: "If I
had saved my money, I would be rich now.", or: "If he hadn't eaten that many
sweets, he wouldn't have become fat."

I did a google search, but somehow, all of the sites I found had different
answers which contradicted each other, as each of them claimed their answer to
be the only correct one.  
I also found something on this site. In an answer here: [Differences among
-たら、なら、-んだったら、-えば,
etc](https://japanese.stackexchange.com/questions/393/differences-
among-%e3%81%9f%e3%82%89-%e3%81%aa%e3%82%89-%e3%82%93%e3%81%a0%e3%81%a3%e3%81%9f%e3%82%89-%e3%81%88%e3%81%b0-etc/396#396),
there's the example:

> あのとき右に曲がれば、どうなっただろう。  
>  If I had turned right back then, I wonder what would have happened.

So it seems like "-ba" is the right conditional to use in this case, but
because I have read so many different answers already, I am still unsure and
would like a longer explanation about which conditional(s?) can be used to
build a correct sentence of the type: "If X had happened (but it didn't), then
Y."




_**Strictly speaking**_ , the Japanese sentence:

> 「あのとき[右]{みぎ}に[曲]{ま}がれば、どうなっただろう。」

does not correspond to the English sentence:

> "If I had turned right back then, I wonder what would have happened."

in the sense that, while the English sentence is perfect by any standard with
its verb tense choices, the Japanese sentence sounds "only colloquially
acceptable".

If you gave that Japanese sentence as your translation of that English
sentence in a Japanese high school or college, you would _**surely**_ be
corrected.

The problem is with both 「曲がれば」 and 「なった」. Informally, as I stated above, we
sometimes actually form this sentence with those casual-sounding tense
choices. "Officially", however, the sentence would need to be formed as:

> 「あのとき右に **曲がっていたのなら（ば）** 、どう **なっていた** （の）だろう(or のであろう)。」 or
>
> 「あのとき右に **曲がっていれば** (or **いたら** )、どう **なっていた** （の）だろう(or のであろう)。」

