Smart-contract for game Stone Paper Scissors

game.sol

pragma solidity >=0.4.18;

contract StonePaperScissors{
    enum VARIANTS {STONE, PAPER, SCISSORS}
    enum WINNER {DRAW, USER, COMP}
    mapping (uint => mapping(uint => int)) winLooseMatrix;
    uint nonce = 132;
    uint houseEdge = 1;
    address  player;
    uint playerChoice;
    uint compChoice;

    constructor() public {
        winLooseMatrix[uint(VARIANTS.STONE)][uint(VARIANTS.STONE)] = int(WINNER.DRAW);
        winLooseMatrix[uint(VARIANTS.STONE)][uint(VARIANTS.PAPER)] = int(WINNER.COMP);
        winLooseMatrix[uint(VARIANTS.STONE)][uint(VARIANTS.SCISSORS)] = int(WINNER.USER);
        winLooseMatrix[uint(VARIANTS.PAPER)][uint(VARIANTS.STONE)] = int(WINNER.USER);
        winLooseMatrix[uint(VARIANTS.PAPER)][uint(VARIANTS.PAPER)] = int(WINNER.DRAW);
        winLooseMatrix[uint(VARIANTS.PAPER)][uint(VARIANTS.SCISSORS)] = int(WINNER.COMP);
        winLooseMatrix[uint(VARIANTS.SCISSORS)][uint(VARIANTS.STONE)] = int(WINNER.COMP);
        winLooseMatrix[uint(VARIANTS.SCISSORS)][uint(VARIANTS.PAPER)] = int(WINNER.USER);
        winLooseMatrix[uint(VARIANTS.SCISSORS)][uint(VARIANTS.SCISSORS)] = int(WINNER.DRAW);
    }
    
    function randomChoice() private returns(uint rndChoice){
        uint randomnumber = (uint(keccak256(abi.encode(blockhash(block.number)))) + nonce) % 3;
        nonce++;
        return randomnumber;
     }
    
    function winOrLoose(uint choiceOne, uint choiceTwo) private returns(string memory winner){
        int result = winLooseMatrix[choiceOne][choiceTwo];
        if (result == int(WINNER.DRAW)) return "Draw";
        if (result == int(WINNER.COMP)) return "Computer wins";
        if (result == int(WINNER.USER)) return "User wins";
    }

    function playCUEFA(CUEFA choice) payable public returns(string memory winner) {
        playerChoice = uint(choice);
        compChoice = randomChoice();
        return winOrLoose(playerChoice, compChoice);
    }   
}