example.sol

pragma solidity ^0.8.19;

/**
 * @notice Game of chicken
 */
interface IChicken {
  // ----------- state vars
  function lastGuesser() external returns (address);
  function winner() external returns (address);
  // function owner() external returns (address);

  function score() external returns (uint256);
  function max() external returns (uint256);
  function isPaused() external returns (bool);


  // ----------- functions

  /**
   * @notice make a guess. If paused, revert.
   * If score < max,
   *   If keccak(timestamp + guess) is even, set lastGuesser to msg.sender
   *   If it's odd, double score
   * If score > max,
   *   set winner to LastGuesser
   */
  function playChicken(uint256 guess) external;

  /**
   * Disable playing the game. Only callable by owner
   */
  function pause(bool paused) external;
}