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ix. The player who takes more points than those to which he is entitled, either in play or in reckoning hand or crib, is liable to be "pegged;" that is, to be put back as many points as he has over-scored, and have the points added to his opponent's side. [In pegging you must not remove your opponent's front peg till you have given him another. In order "to take him down,'' you remove your own back peg and place it where his front peg ought to be, you then take his wrongly placed peg and put it in front of your own front, as many holes as he has forfeited by wrongly scoring.] x. No penalty attaches to the taking of too few points in play, hand, or crib. xi. When a player has once taken his hand or crib, he cannot amend his score. xii. When a knave is turned up, "two for his heels" must be scored before the dealer's own card be played, or they cannot be taken. xiii. A player cannot demand the assistance of his adversary in reckoning hand and crib. xiv. A player may not, except to "peg him," touch his adversary's pegs, under a penalty of two points. If the foremost peg has been displaced by accident, it must be placed in the hole behind the peg standing on the board. xv. The peg once holed cannot be removed by either player till another point or points be gained. xvi. The player who scores a game as won when, in fact, it is not won, loses it.