It is 6.5 points roughly for each dice. 27 frags would need 27*25=675 points. 675/6.5 is roughly around 100 dices. You will get 14 free dices. 86 dices would cost 86*20= 1720 coupons.

I got it and i have collected the data for lucky board. If you need you can see it.

https://forum-narutoen.oasgames.com/page/show-post-26563-1.html