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Tactics trainer - What is the meaning of the outcome percentage?

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takeonme
Date ID Rating Moves Target Time My Time Avg Time Outcome My Rating
Jun 19, 2018 0051191 1270 2/2 0:20 0:38 0:44 (91% | +5) 
1545
Jun 19, 2018 0103671 1804 3/3 0:46 5:42 1:34 (50% | +2) 
1540

Looking at the table, I gained 2 points for the puzzle rated 1804. It gives the outcome as 50%. What does this mean? It can't mean that I would have scored 4 points if I answered within the target time, as in the table there's a puzzle rated much lower at 1270, for which I gained 5 points. So what does this outcome percentage mean?

IMKeto

Its basically, the faster you solve it, the more points you get.

takeonme

Yes, I understand that. But I was asking specifically about the outcome percentage of 50% and how it relates to the 2 rating points gained.

IMKeto

https://support.chess.com/customer/portal/articles/1444811

takeonme

I've seen that page already, it makes no mention of the percentage in the outcome column that I'm asking about.