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CW 26/22 - Riddle Me

If you have been studying for the past few hours and are riddled on how to take a short break, here we offer you a brain game to recover.
And if you haven't been studying, stop immediately and return in 3 hours.

 

Easy Riddle:
You have a chain of 23 links.
How many links do you have to open to reach all possible chain lengths from 1 to 23 by rejoining these sections ?

 


Advanced Riddle:
Two players play against each other on nine squares (3x3).
Each takes turns occupying squares by drawing crosses (1, 2, or 3 in a selected row/column).
The winner is the player who occupies the last free square.

Is there a winning strategy under these conditions ?
If so, for which player ?