On: Ask HN: I am having a competation from bigger play...

[ssing]

I am also counting on it but the rewards Yahoo is providing to the winners is huge and will draw lots of attention.

[ehsanul → ssing]

You can try to direct some of that attention to yourself, since you're in the same space. You can't compete on prizes, but you'll have a different offering - you have to distinguish your product from Yahoo's product in other ways.