That is a nice thing to consider, actually!
5+3 is 420/480 (move 40/60)
20+10 is 1600/1800 (assuming 20+10 gets implemented, but 15+15 is 1500/1800, so not a huge difference anyhow)
------ Middle of these two would be 1010/1140
To remind you, these were the two main suggestions:
10+5: 800 / 900
15+5: 1100 / 1200
So 15+5 would also fit the "Slowish chess with Increment" 'spread' a good bit better than 10+5, not just the "Rapid" one..
.. In theory.
In practice, as I mentioned above, how much Increment we got probably doesn't matter a massive deal; but you still have to plan for 30minutes+ (just like for 15+15), as opposed to 20+ (for 10+5) or 10+ (for 5+3).
In that sense, 10+5 indeed fits a lot better, as "Slow chess with Increment, but not too slow"
In particular if we ignore 5+3 altogether (which in the end is still Blitz), and say eg that the Range of Slowchess-with-Increment starts at 10+2, and realistically ends at 25+15, we get something like this for a spread:
10+2: 680/720 - 25+15: 2100/2400; so 680-2100 move 40 wise
With 20+10 we'd have something on the high end (1600), and thus should also get something on the lower end of the spectrum, at ~900 or so ideally; 1100 is a bit far up.
So ya, guess I'm coming around to 10+5 :)
5+3 is 420/480 (move 40/60)
20+10 is 1600/1800 (assuming 20+10 gets implemented, but 15+15 is 1500/1800, so not a huge difference anyhow)
------ Middle of these two would be 1010/1140
To remind you, these were the two main suggestions:
10+5: 800 / 900
15+5: 1100 / 1200
So 15+5 would also fit the "Slowish chess with Increment" 'spread' a good bit better than 10+5, not just the "Rapid" one..
.. In theory.
In practice, as I mentioned above, how much Increment we got probably doesn't matter a massive deal; but you still have to plan for 30minutes+ (just like for 15+15), as opposed to 20+ (for 10+5) or 10+ (for 5+3).
In that sense, 10+5 indeed fits a lot better, as "Slow chess with Increment, but not too slow"
In particular if we ignore 5+3 altogether (which in the end is still Blitz), and say eg that the Range of Slowchess-with-Increment starts at 10+2, and realistically ends at 25+15, we get something like this for a spread:
10+2: 680/720 - 25+15: 2100/2400; so 680-2100 move 40 wise
With 20+10 we'd have something on the high end (1600), and thus should also get something on the lower end of the spectrum, at ~900 or so ideally; 1100 is a bit far up.
So ya, guess I'm coming around to 10+5 :)