illegal move meaning in English

非法移动

His opponents say this was an illegal move
可他的反对者却说这种做法将不符合法定程序。
Illegal move ! nthis should never occur
无效棋!不会发生这种情况
What penalties should be taken against the players who made the illegal moves
对棋手走出不符合规则棋步的处罚是什么？
For the first two illegal moves made by a player , the arbiter shall give two minutes extra time to his opponent in each instance ; for a third illegal move by the same player , the arbiter shall declare the game lost by this player
当一名棋手出现两次走出不符合规则的棋时，裁判有权每次通过给对手额外增加两分钟的方式对棋手给予处罚；当同一棋手出现第三次走出不符合规则的棋时，裁判将宣布该名棋手输棋。