Before reading my issue, please know that I'm very impressed with this, and I got a lot out of reading the README - thank you / really well done! --- I'm using PuTTY v0.73 to access an Ubuntu 18.04 machine, compiled as per the [README](https://github.com/carlini/printf-tac-toe/blob/master/README.md). Step 1: Run, empty board is presented: ![image](https://user-images.githubusercontent.com/2195519/84024833-7ad76300-a982-11ea-976c-3424bf1de334.png) Step 2: Enter 5 and press Return: ![image](https://user-images.githubusercontent.com/2195519/84025030-cdb11a80-a982-11ea-8c7c-420edbcc8bb4.png) Step 3: Enter 1 and press Return: ![image](https://user-images.githubusercontent.com/2195519/84025082-e1f51780-a982-11ea-8158-7650c8c6f115.png) --- It turns out that the string `PuTTY` is sent to `stdin`... I've never quite figured out what causes these to occur, and I've seen them in the past too - mainly when accidentally writing binary data to `stdout`. If I remove the `PuTTY` input with 5x Backspace then I can play the game... if I'm lucky... --- However, I also notice that playing the following game, results in some "_invisible_" characters in the input buffer, allowing me to press backspace, and get the cursor to wrap back on to the previous line: `5`, `1`, `7`, `3` ![image](https://user-images.githubusercontent.com/2195519/84026057-8592f780-a984-11ea-828f-b58dec8a346c.png) If I _do_ clear this "_invisible_" input, then the following game runs to completion: `5`, `1`, `7`, `3`, `2`, `8`, `4`, `6`, `9` ![image](https://user-images.githubusercontent.com/2195519/84026230-da367280-a984-11ea-86d9-f2b07b5792c0.png) If I _don't_ clear this "_invisible_" intput (i.e: I only press 5x Backspace to remove the `PuTTY`, or multiple thereof), then the game goes wonky... it may run to the end, or it may make wrong statements. ![image](https://user-images.githubusercontent.com/2195519/84026524-621c7c80-a985-11ea-9d7a-120b8139e188.png) --- I suspect that this "_invisible_" input is also related to PuTTY, hence putting all of this in a single issue.

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