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