Pretty good advice. I’d just add that, as noted, computers are really only good at pointing out missed tactics. They will not explain WHY one move is better than another. In any given position there may be several moves that are acceptable positionally.
Yes, tactics will win games, but to really understand chess you have to understand why one position is better than another…that means you have to have a grasp of the basic elements of positional play also. Studying only one area will help you advance but it will also retard your growth if you become only a one trick tactical pony. Beginners a prone to gross tactical blunders but eliminate them and you will find tactical errors are often the result of anti-positional moves.
Here’s an interesting observation by FM Jon Jacobs:
"I'm also skeptical of all the adulation that guys your strength - those who blog, at least - seem to lavish on those automated tactics training programs.
Of course tactical prowess is vital; but it could well be that people absorb tactical themes more efficiently by going over entire games in depth (especiallly, YOUR OWN games) - as opposed to analyzing isolated positions, which is what the tactics servers do. And of course, if you're focusing on speed - trying to solve X problems in Y minutes, rather than delving as deep as you can into each one until you either solve it or run out of ideas - then obviously you'll learn nothing, it's simply an aimless amusement.
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