Help with translation, 「こっちっ側中心に攻める」


Manga context: characters are on a beach, there are shallow waters near the
shore, but further away there are some poles sticking out and from there start
deep waters. The character says:

> あの棒のとこから、あっちは底なしになってるからー

(this line is clear) and then

> あの[洲]{す}よか、こっちっ側中心に攻めるってことでねー

(the only furigana is from the manga itself) and I don't get this line.

My questions are:  
1. How the second line translates? Literal translation is preferred as I'd like to understand every bit of this line.  
2. What's the reading of 側 here?  
3. What second っ in こっちっ does here? Is it an accent/colloquialism, or does it stand for something?  




Without the knowledge of the context of Manga, I interpret the second line of
your quote as; We (or They) will focus the attack on this side rather than
that sandbank.

“こっち側(がわ)” is a colloquial form of “こちら側,” meaning this side.“But I’ve never
heard of “こっちっ側.” Actually a red warning line of the automatic spell checker
pops up below “こっちっ” when I’m typing the word. It must be a typo, or very
special parlance used in the Manga world.

The original meaning of the word '攻める' is "to attack / assault"
like「敵（城）を攻める」- attack the enemy (castle) -, but it is used in the meaning of
"to deal (play) with sth." like 「こちらの問題から攻めて見るか - Shall we try to play (start)
with this question first? - as well today.




> 「あの[​洲]{す}よか、こっちっ[側]{かわ}[中心]{ちゅうしん}に[攻]{せ}めるってことでねー」
>
>   1. How the second line translates? Literal translation is preferred as I'd
> like to understand every bit of this line.
>

"So, we/I should concentrate our/my attacks on **_this_** side of that
sandbank, eh?"

「よか」 is a more informal form of 「よりか」, which is already informal. The more
formal forms are 「より」 and 「よりも」.

「あの洲よかこっちっ側」 means "this side, rather than the other side, of the bank". In
other words, "the speaker's side", "the side that is closer to the speaker",
etc.

>   2. What's the reading of 側 here?
>

It is 「 **か** わ」 unlike what was said and even upvoted in the comment above.

If it were 「こっち側」, then the 「側」 would be read 「 **が** わ」.

>   3. What second っ in こっちっ does here? Is it an accent/colloquialism, or does
> it stand for something?
>

The small っ makes it even more colloquial/informal. This can be said about so
many other words as well.

In the order of formality: こちら側 ⇒ こっち側 ⇒ こっちっ側

Other examples:

「[人懐]{ひとなつ}こい」(amiable, sociable, etc.) ⇒ 「人懐 **っ** こい」

「めちゃ」(very) ⇒ 「め **っ** ちゃ」

