We want to
find strategies to win in various games.  It is possible that
there is a systematic way to find such strategies for all games, but we
will first explore specific games.
For the first game, you can play against the computer 
here
or against a human 
here
and figure out the rules, or read this:
Chomp
Start with an m by n rectangle.  The 1st player picks a box
and remove the boxes above and to the right of it including
itself.  The 2nd player does the same.  Repeat until
a player is forced to pick the (poison) box in the lower-left corner,
in which case he loses.