 Solution

val game = new Chomps(6)
var player = 1
while (game.Count() > 0) {
  game.Display()
  var accepted = false
  var x = 0
  var y = 0
  while (!accepted) {
    try {
      println("Player " + player + ": enter x, then y")
      x = scala.io.StdIn.readInt()
      y = scala.io.StdIn.readInt()
      accepted = game.Legal(x, y)
      if (!accepted) println("That cell is not a legal move; try again.")
    } catch {
      case _: NumberFormatException => println("Please enter integer coordinates.")
    }
  }
  game.Move(x, y)
  if (game.Count() == 0)
    println("Player " + player + " loses; player " + (3 - player) + " wins.")
  else player = 3 - player
}