The sentence is:

> ギャンブラーを名乗るなら、采の目ぐらい、投げ方ひとつで自由に出せるようになっておけ.

MC is revealing a secret how to win every dice game. But I'm not sure the
meaning of his words. Does it mean throwing dice one by one?
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2014-08-17T23:50:18.507
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translation meaning
Meaning of ひとつで自由に出せるように
ひとつ（で） actually applies to the previous word 投げ方 here. It's kind of like だけ in
this usage; he is saying to become able to control the result of the dice
_solely through just_ the 投げ方 (way of throwing).

In the above sentence, the 投げ方 is described as the sole deciding factor for
producing the result.

Wiktionary has a good example of the usage:

> ある物事を左右する要素。 (The factor that influences another event.)  
>  君の返事 **一つで** どうにでもなることだ。 _(All it would take is) the right reply from you
> and this could all go away._

That's not to say that there aren't other ways the situation could be
resolved, but a reply would serve on its own to decide things all by itself.

大辞林 also highlights its use in this kind of situation.

> ひとつ【LHL】 【一つ】  
>  一  
>  （ 名 ）  
>  ⑥ そうすることによって決まる，それ次第であることを強調していうときに用いる。 「やるかやめるか決心 **ひとつ** だ」 「心の持ちよう
> **ひとつで** どうにでも変わる」 (used to emphasize that sth _will be resolved/settled by
> doing X_ ; or _hinges on / is dependent on X_ ). " _To do it or not -- it is
> all a matter of how you will make up your mind._ " " _You can be whatever
> person you want to be; it all depends on your attitude._ "

大辞泉 is more plain about it and says not much more than だけ, but I get the
impression that it's stronger than だけ and gives a greater sense of exclusion.

> ９ 名詞の下に付いて、それ以外にはないことを強調する語。…だけ。「身 **ひとつで** 脱出する」「母の手 **ひとつで**
> 育てられる」「行くか行かないかは自分の決心 **ひとつ** だ」 (Following a noun, emphasizes that there is
> nothing else than that. ... _dake_.) " _Make it out using nothing more than
> one's own body_ " " _Be raised solely by the hand of one's mother" "Whether
> to go or not entirely hinges on your own ability to decide_ "

(translations are mine)
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2014-08-17T23:37:11.603
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answer