Is blitz bad for your slow play?

This is what a former coach of mine IM Valeri Lilov told me.

If you're serious about improvement, then stay away from bullet, and blitz.  If you do want to play rapid games. Limit them to a few a day, and 30 minutes, but preferably at least G45.

hi! nice to meet you!

Hear hear!

whoah

I agree in general that you're much better off sticking to a couple of openings which you know in-depth. What I would add though, is that you probably need more than one for black, as you don't know what your opponent will open with. But anyway, you can often transpose into something close to what you know. At the end of the day, concepts are usually much more important than exact lines, especially at amateur level. 

Are you in a box that has not yet been opened? How is the cat doing?

"... I have strong anecdotal evidence that balancing slow and fast chess practice provides optimum benefits … . In my experience, students who play fast chess almost exclusively have problems visualizing (moving pieces around in their head), they often play the occasional slow game too quickly, and have difficulty in planning and endgames. Players who play only slow chess have difficulty learning their openings, recognizing critical positions and basic tactical patterns, and often panic in time trouble. The best solution, as in many things, is a healthy balance. I would guess up to ninety percent of your playing time should be slow games (thirty minutes for each player or preferably more) and the other ten percent speed games. ..." - NM Dan Heisman (2009)

https://web.archive.org/web/20140627020325/http://www.chesscafe.com/text/heisman100.pdf

TY

yeppie.

Speed/Rapid chess tends to be primarily an exercise in moving pieces around faster than your opponent while avoiding checkmate, in hopes that his/her clock runs out sooner than yours.  There is little time to think about what you should be doing.

It makes sense that taking more time to think about what you should be doing would promote improvement in your chess skills.

An effective way to improve your chess is therefore to play mostly longer time controls, including "daily" chess, so you have time to think about what you should be doing.
This is not to suggest that you should necessarily play exclusively slow time controls or daily games, but they should be a significant percentage of your games, at least as much, if not more so than speed games which do almost nothing to promote an understanding of how to play the game well.

Here's what IM Jeremy Silman (well-known chess book author) has to say on the topic...

https://www.chess.com/article/view/longer-time-controls-are-more-instructive

By Dan Heisman, famous chess teacher and chess book author…
https://web.archive.org/web/20140627052239/http:/www.chesscafe.com/text/heisman16.pdf

https://www.chess.com/blog/RussBell/dan-heisman-resources

and the experience of a FIDE Master...

https://www.chess.com/forum/view/general/how-blitz-and-bullet-rotted-my-brain-don-t-let-it-rot-yours 

for some good stuff on general chess improvement, check out my blog!.....

https://www.chess.com/blog/RussBell

"... WGM Jennifer Shahade ... : … '... I think blitz can be very good for you... ... but if you don't look up your openings after the game you are missing most of the point.' ...

... I recommend that if you are a beginner, you should avoid speed chess for a variety of reasons. Among them:

• it can get you into a variety of bad habits,
• cause inexperienced players to rush in slow games, and
• can be very frustrating when you are not very good and can't see the chessboard very accurately in a short glance.

However, once you get good enough to have sufficient board vision and tactical vision to play speed games, I do recommend you add them to your practice repertoire. This usually occurs in the 1200-1400 range, but of course can vary widely. ...

… if done reasonably, speed chess is good for you." - NM Dan Heisman (2017)

https://www.chess.com/article/view/is-speed-chess-good-for-you

is that a tournament?