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RockPaperScissors Smart Contract - B9Lab Course Practice

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b9lab-rockpaperscissors

RockPaperScissors Smart Contract - B9Lab Course Practice

Overview:

You will create a smart contract named RockPaperScissors whereby:

  • Alice and Bob can play the classic rock paper scissors game
  • to enrol, each player needs to deposit the right Ether amount
  • to play, each player submits their unique move
  • the contract decides and rewards the winner with all Ether

Stretch goals:

  • make it a utility whereby any 2 people can decide to play against each other
  • reduce gas cost as much as you can
  • make it a multi-game utility

Implementation:

The following implementation choices has been made not explicitly required by spec:

  • an agreement between players shall happen off-chain before game setup
  • the first player starts a new game submitting also the game parameters and its hashed move
  • the second player joins later the game submitting its own move
  • the first player then reveals its move and the winner is...
  • in case neither join nor reveal phase happened in time, any player can claim victory
  • when the game has no winner the contract gives back the deposited Ether amount to each player

Limitations:

The following limitations currently apply:

  • no check for arithmetic overflow
  • no web page

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