These tactics are used so often that any student of chess must know them and know them well.
soheil1 May I delete the underlined in:These tactics are used so often that any student of chess must know them and know them well. Well, you would have to delete 'and', not 'must'. The grammar holds up, but the emphasis is lost.
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soheil1May I delete the underlined in:These tactics are used so often that any student of chess must know them and know them well.Well, you would have to delete 'and', not 'must'. The grammar holds up, but the emphasis is lost.