Ruby Quiz - (Crypto) Blockchain Contract Edition - Challenge #1 - Create a 3x3 Tic-Tac-Toe Player vs Player Game Contract

Hello,

  I've started a new ruby quiz for secure (crypto) contract blockchain
scripting [1].

  Challenge #1 - Create a 3x3 Tic-Tac-Toe Player vs Player Game Contract

Let's use the "Creating a Tic-Tac-Toe Smart Contract" [2] tutorial
and "real-world" sample contract from the EOS.IO blockchain.

  The challenge: Code a contract for a 3x3 tic-tac-toe player vs player game
using sruby :-).

  Can you do better (than the EOS.IO C++ "monster")?

  Post your code snippets (or questions or comments) on the "official"
Ruby Quiz Channel,
  that is, right here on the ruby-talk mailing list.

  Cheers. Prost.

PS: New to New to (Secure) Ruby Programming?

See the "Red Paper" about sruby [3] - Small, Smart, Secure, Safe,
Solid & Sound (S6) Ruby - The Ruby Programming Language for Contract /
Transaction Scripts on the Blockchain World Computer - Yes, It's Just
Ruby

PPS: A Hello, World - Greeter Contract sample:

```
############################
# Greeter Contract

def initialize( greeting )
  @owner    = msg.sender
  @greeting = greeting
end

def greet
  @greeting
end

def kill
  selfdestruct( msg.sender )  if msg.sender == @owner
end
```

[1] https://github.com/s6ruby/quiz
[2] https://developers.eos.io/eosio-cpp/v1.3.1/docs/tic-tac-toe-tutorial
[3] https://github.com/s6ruby/redpaper

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