The first is natural, the second is not (even if you omit a guarded ).
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CliveAny difference between "Though the e5-**** is already guarded by the Queen, Black decides to give the **** some additional support."and "Though the e5-**** was also guarded before this time guarded by the Queen, Black decides to give the **** some additional support."In #1, is means the **** is guarded at present.In #2, 'was' suggests it was guarded in the past but p