Let's look at this one and see if you can find a strategy for it:

**Players alternate writing a number from 1 - 9 (once used, it’s dead). First one with a set of three numbers that sum to 15 wins.**

Is there a guaranteed winning strategy for Player 1?

Is there a guaranteed winning strategy for Player 2?

source:

```
Players alternate writing a number from 1 - 9 (once used, it’s dead). First one with a set of three numbers that sum to 15 wins.
— Chris Lusto (@Lustomatical) July 16, 2015
```

How does his later comment help? "It’s equivalent to tic-tac-toe since any row/col/diagonal in a 3x3 magic square sums to 15, but more mathematically interesting."