user23713: I'm wondering what would be, in terms of efficient fast improvement, the best training module between puzzle rush (fast calculation and pattern recognition strengthening) and traditional timeless puzzle solving (deep calculation strengthening) ?
Does one become better than the other at some specific elo range or vice-versa?
I usually focus on timeless puzzles as I feel like deep calculation is very important for serious OTB classical/rapid games but wonder if it would be more time efficient to train with puzzle rush instead.

user26399: I'd recommend starting off with traditional puzzle solving. Once you get to whatever your target range is and have a good accuracy rate (80-100%) and you can finish each of the puzzles in 45 seconds or less, move on to puzzle rush. Of course, when you get to 100 - 200 points below your target, and are accurate and quick, you could gradually start moving on to puzzle rush from the traditional puzzle solving.

23713: <p>I'm wondering what would be, in terms of efficient fast improvement, the best training module between puzzle rush (fast calculation and pattern recognition strengthening) and traditional timeless puzzle solving (deep calculation strengthening) ?</p>
<p>Does one become better than the other at some specific elo range or vice-versa?</p>
<p>I usually focus on timeless puzzles as I feel like deep calculation is very important for serious OTB classical/rapid games but wonder if it would be more time efficient to train with puzzle rush instead.</p>
 26399: <p>I'd recommend starting off with traditional puzzle solving. Once you get to whatever your target range is and have a good accuracy rate (80-100%) <em>and</em> you can finish each of the puzzles in 45 seconds or less, move on to puzzle rush. Of course, when you get to 100 - 200 points below your target, and are accurate and quick, you could gradually start moving on to puzzle rush from the traditional puzzle solving.</p>
