user15234: Do serious chess players ever play time-controls without increments?
Not necessarily limiting to GMs but let's say professionals or "amateur-professionals".

user7726: Around here matches between the local counties (Chiltern League, UK) still have a guillotined time limit of 2 hours each for all moves. All other competitions I play in have increments; in fact I won't nowadays play in a competition unless it has an increment, Chiltern League excepted, though I can't actually remember when this was last an issue.
Whether you count me as "serious" is another matter ( 1932 ECF, play about 50 rated games a year), but in our last Chiltern League match there was an IM and two FMs playing, along with a few other 2100+ players.

user24693: The most recent tournament I played, the Grenke Open 2019, had a time control of 2 hours for 40 moves and 30 minutes for the rest of the game, no increment. Considering the number of 2600 players in that tournament, I would be inclined to answer yes.
Since then there hasn't been another Grenke Open, so that answer is a bit old but I doubt they would add increment. I think with a very large tournament and two rounds per day it might otherwise be difficult to schedule. (at least with the usual 30 seconds per move increment)

15234: <p>Do serious chess players ever play time-controls without increments?</p>
<p>Not necessarily limiting to GMs but let's say professionals or &quot;amateur-professionals&quot;.</p>
 7726: <p>Around here matches between the local counties (Chiltern League, UK) still have a guillotined time limit of 2 hours each for all moves. All other competitions I play in have increments; in fact I won't nowadays play in a competition unless it has an increment, Chiltern League excepted, though I can't actually remember when this was last an issue.</p>
<p>Whether you count me as &quot;serious&quot; is another matter ( 1932 ECF, play about 50 rated games a year), but in our last Chiltern League match there was an IM and two FMs playing, along with a few other 2100+ players.</p>
 24693: <p>The most recent tournament I played, the Grenke Open 2019, had a time control of 2 hours for 40 moves and 30 minutes for the rest of the game, no increment. Considering the number of 2600 players in that tournament, I would be inclined to answer yes.</p>
<p>Since then there hasn't been another Grenke Open, so that answer is a bit old but I doubt they would add increment. I think with a very large tournament and two rounds per day it might otherwise be difficult to schedule. (at least with the usual 30 seconds per move increment)</p>
