any technique how to guess this?
Finding the number of digits the number has might be a good start.
I am giving away 1 mBTC to the person who can guess the number I have in mind
The number is between 1 and 1.000.000.000.000.000.000.000.000.000.000.000.000.000.000
I will answer any yes/no question.
Only 1 question at a time and you are only allowed to post when you aren't the last poster.
If you play it smart you should be able to guess the number in not too many guesses
hash of the number : 7e8f7d4a1e0007d444c2d310e7f4d9c743f0fa59c86ba440590b415ec024dc9f
The number is between 1 and 1.000.000.000.000.000.000.000.000.000.000.000.000.000.000
It mean this is impossible to guess, and all for 0.001 btc? lol.
This is a nice troll giveaway, keep having fun. my prediction is;
999999999999999999999999999999999999999999
The number is between 1.000.000.000.000 and 250.000.000.000.000.000.000.000.000.000.000.000.000.000. Shouldn't take long if we ask the right questions.
I am giving away 1 mBTC to the person who can guess the number I have in mind
The number is between 1 and 1.000.000.000.000.000.000.000.000.000.000.000.000.000.000
I will answer any yes/no question.
Only 1 question at a time and you are only allowed to post when you aren't the last poster.
If you play it smart you should be able to guess the number in not too many guesses
hash of the number : 7e8f7d4a1e0007d444c2d310e7f4d9c743f0fa59c86ba440590b415ec024dc9f
is the number below 1000000000000?
no

Is the number higher than 250.000.000.000.000.000.000.000.000.000.000.000.000.000?
no
Maybe this information should be added to the OP. Makes it easier for new players to enter.
Is the number greater than 1.000.000.000.000.000.000.000.000.000.000?