Game Set and Match

[Leanne]

I will just quickly mention line breaks -- this is a stylistic choice and tends to be something of a matter of personal preference, but I really think this poem would be better served with longer lines. If you feel you must keep them short, try to remember that for a reader, the most important words are the first and last of any line -- so each break should reflect that. What words do you want the reader to dwell on? Where do you want your breaks to lead them? (It's also a matter of practise, so try not to feel overwhelmed, I only mention it because it's a bit of an obsession of mine )

Sensing
she was merely a porn
for the knight,
bordering
on the
perverse of his needs
she may have succumbed
had her logic
proved statistically
awry. -- I am such a sucker for puns, and these work really well. We have a good idea of what's to come from the tone, but not so much that the whole story is given away.

He had the king
after all, ensconcing -- I like the word, but you kind of need to be esconcing something, one doesn't just esconce
to make her queen
disappear.
She’d seen many others
lose their castle, watch their horses -- there is a problem with either the tenses or the subject, depending on what you mean here. Had she watched their horses fall? (in which case that needs to be past tense). Or had she seen others lose their castle(s) AND watch their horses fall?
fall.

Aged and armed
with such an inscribable charm,
still, he was no match
for her intrepid
nature, having never played
the game of life -- this is bordering on cliche and I don't think you need to explicitly state it -- just "this game" would do, as the "life" part is implied
before, believing there’s no sin
in all or nothing,
losing was never -- this probably should be a new sentence, not following a comma -- if you don't want a full stop on the preceding line (and it could be disruptive to the flow) then try a semi-colon. Yes, we pick at nits that small! Punctuation can make quite a difference.
going to be an objective
however
well observed.

She danced
like a negative
with the Devil and his disciples-
and thank GOD, -- I'm not sure that the caps work at all, but this is a great close.
she won… -- you could lose the ellipsis -- this is a final statement