Meaning of 'could have done something'? [closed]

In the following sentence,

If you had tried harder you could have succeeded.

does could have succeeded mean would have been able to succeed, or might have been able to succed, or is it ambiguous if no further context is provided?

I- could have succeeded
You use this form when the usual conditions for succeeding appeared to be met and either when the action 1/ failed (or state failed to be realized) or 2/ was being considered before it could occur.
(material possibility (ability) in the past)

• The attack on the fortress could have succeeded as the cannons could open a breach in the wall but inside there were as many soldiers as in three garrisons, and it failed.

• From all the information that we had gathered, this plan could have succeeded, and therefore we chose to implement it.

II- would have been able to succeed
You use this form when there was evidence that the conditions for succeeding would be met, and either when the action 1/ failed (or state failed to be realized) or 2/ was being considered before it could occur.
(assumption in the past)

• He would have been able to succeed since until then his grades on all subjects were excellent; there was no reason he wouldn't have had grades as good in the last year, but in that last year he had been disabled by a grievous illness and he could hardly do any studying, and so, he failed.

• He would have been able to succeed in those days as he had more means, but nowadays it is that very scantiness of his finances that keeps him from trying.

III- might/could have been able to succeed
You use this form when there was a possibility for the conditions for succeeding to be met, and either when the action 1/ failed (or state failed to be realized) or 2/ was being considered before it could occur.
(possibility in the past subject to no condition)

• This team might/could have been able to succeed since they had managed several times before to achieve such a task successively, but they came too late.

• Where all had failed the boy might/could still have been able to succeed, and so he was called to captain's tent, who briefed him for his mission.

IV- It follows that "could have succeeded" means neither "would have been able to succeed" nor "might have been able to succeed".