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docs/eCookbook/examples-for-reddit-posts/tic-tac-toe.md

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+## Tic Tac Toe 
+
+In response to Reddit post:
+https://www.reddit.com/r/learnpython/comments/iq4wfs/question_how_do_you_manage_events_lots_of_events/
+
+The basic question is how to handle events coming from a large number of sources, or a large number of buttons in this case.
+
+The answer is to use the information about the button along with a datastructure to record some information about it.  In this case, for Tic Tac Toe, the "Game Board" is where you want to record information.  You want to know if a spot is taken and if so, by who.
+
+One simple way to do this is via a dictionary.  Record each spot that's been played in a dictionary.  The "key" will be the board location and the value will be which player played a piece there.
+
+Because keys can be "anything" in PySimpleGUI (the exception is they cannot be lists), a tuple would be a good choice.  This gives you a (row, col) description of the piece and fits well visually too.  You can use the row, col in a loop to create the board.  Because list comprehensions can be used to create layouts, then it works out well to use row, col as the key.
+
+This is how the window looks runnins on Windows:
+
+![SNAG-0933.jpg](/api/files/5f5cf5e5a3ab12a454fa21dc/snag-0933.jpeg "SNAG-0933.jpg")
+
+
+The main board is created with this single line of code:
+
+```python
+[[sg.Button(size=(3,1), key=(row,col)) for col in range(3)] for row in range(3)]
+```
+
+Because lists can be combined, it's possible to "build" a layout up from pieces.  In this case, there are 3 sections to the board.  There's a Text header at the top, then the board, then a couple of buttons on the bottom.  This layout can be built with 3 lines of code.   There's the initial Text Element at the top that starts the layout.  Then the board is added on and finally the buttons.  The layout creation is thus:
+
+```python
+layout =  [[sg.Text('X Starts First')]]
+layout += [[sg.Button(size=(3,1), key=(row,col)) for col in range(3)] for row in range(3)]
+layout += [[sg.Button('Reset'), sg.Button('Cancel')]]
+```
+
+The rest of the code is pretty self-explanatory.  It involves using a dictionary to store the locations that have been played and which player played that location.
+
+Because the board is small, you'll want to click the upper left corner of the code display and choose the Display Full Screen option.
+
+<iframe src='https://trinket.io/embed/pygame/09309ffae2?start=result' width='100%' height='450' frameborder='0' marginwidth='0' marginheight='0' allowfullscreen></iframe>