AddressEquality.sol

pragma solidity 0.5.16;

contract Escrow {
    uint256 public anteAmount;
    
    address game;
    address player1;
    address player2;
    
    
    Escrow addr = Escrow(this);
    address payable escrowWallet = address(uint160(address(addr)));
    
    constructor(address _player1, address _player2, address _game) public {
        player1 = _player1;
        player2 = _player2;
        game = _game;
    }
    
    function placeAnte(address player) public payable returns (bool) {
        require(player == player1 || player == player2, "invalid player address.");
        return true;
    }
}

contract Game {
    
    function challengeOpponent(address opponent) public {
        Escrow escrow = new Escrow(msg.sender, opponent, address(this));
        escrow.placeAnte(msg.sender);
    }
}