Are 行きゃあ and 行きゃ both contractions of 行けば?

Question

I started playing another old game, Game Boy Wars Advance 2, and I ran across this bit of dialogue:

ま、どのみち、マクロランドに行きゃあ、
いやでも戦わなきゃなんねえんだ。

I think this is something like:

ま、どのみち、マクロランドに行けば、
いやでも戦わなければならないのだ。

Thanks to a helpful comment by Tsuyoshi Ito, I learned that おけば can be contracted to おきゃ. More generally, I learned that e + ば can be contracted to ゃ (small や). Based on this rule, I'm guessing that 行きゃ is a contraction of 行けば.

Of course, the dialogue I quoted says 行きゃあ, not 行きゃ. My guess is that e + ば can also be contracted to ゃあ, and based on this I guess that both 行きゃあ and 行きゃ are contracted forms of 行けば. Is this correct?

(My other guess is that perhaps it's 行ければ...?)

Answer 1

The extra あ only comes from lengthening the きゃ and could equally well have been written 行きゃ～. Just in the middle of the sentence it looks better as 行きゃあ.

The sound is lengthened, because there is a small break when saying the sentence. For example, in

行きゃいいじゃねぇか
Why don't you go?

a lengthening wouldn't be natural.

I presume if you really want, 行ければ can also be contracted to 行きゃ, but 行けりゃ probably works better.