Thank you for the reply.
You have a point, practice makes perfect.
However, if an easily explained "method" can be made it could be used as guide on the site in the strategy section. I reviewed the "Mathematics of Poker" article and could not find the "double gutshot" in the chart, page 2, under 8 outs. In general, the material on the site is excellent and I assume that there must be interest in improving it if possible.
Consider a couple of examples if you will:
Example 1:
Holecards: JT
Flop: K-9-7 => Q or 8 makes the straight.
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Example 2:
Holecards: 86
Flop: T-7-4 => 9 or 5 makes the straight.
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In example 1, JT makes the succession JT9.
The difference of 2 is then found/seen: "K (=13) - J (=11) = 2" and "9 - 7 = 2".
In example 2, 86 makes the succession 876.
The difference of 2 is then found/seen: "T (=10) - 8 = 2" and "6 - 4 = 2".
The "method" -- at least in my silly mind -- proposes a set of patterns to search for. Which may or may not be what experience teaches you on a sub-conscious level. If newer players can find this method (or an improvement thereof) helpful I guess there would be some merit to it.
I play ~8 NLHE 0.5/0.1 on PokerStars but I'm not tracked since I made the account before finding this site. I've then tried other ones, accumulated points and seen videos, but their bad software keeps me away. At least until I can play higher stakes (and less tables => less table selection in general).