Can you clarify your guess please. The dynamite is an extra go and you only need to chose 1 coordinate. It will blow up and unearth the 3 additional coordinates around it as shown in the pattern i.e. if you choose N5 then N6, O5 and O6 will also be included.

You have also resteemed the post and have 4 guesses per day so I will also need another 4 guesses.

Edit your post and I will let you know if you have found anything :)