OTB actions

I would mention it. Being a good sport is more important than winning at all costs because you will see most of your opponents again.

If they forget to punch the clock chronically, then they probably need to learn the hard way.

you see how distracting it is to you! you no longer focus on the game, but dwell on whether the opponent will press his clock.
so to focus on your game again, it is best to alert your opponent about hsi clock.
EOD

As an aside, digital clocks support "N moves in time T" time controls. For this, they count the moves based on how often the clock is pressed. So if your opponent doesn't press the clock, and then you move without pressing (because his time is running anyway), then the move counter will not get incremented.

Originally posted by Varenka
As an aside, digital clocks support "N moves in time T" time controls. For this, they count the moves based on how often the clock is pressed. So if your opponent doesn't press the clock, and then you move without pressing (because his time is running anyway), then the move counter will not get incremented.

Originally posted by Mad Rook
True, but your score sheet is the official record of your game, not the clock's move counter.

Originally posted by Varenka
You missed my point. For 40 moves in 2 hours, the players could both play their 40 moves on the board (and on their scoresheet) while the clock only knows about 39 moves. So it won't change to the next time allocation automatically.

So what happens if White has a long think of the actual 41st move? It's not going to come off the 2nd time control if the clock doesn't think the initial time control has been completed.

Originally posted by Mad Rook
I'm not sure what you're getting at, unless you mean that the players have the responsibility of staying on top of the correct number of moves in a non-sudden death time control and adjusting the clock accordingly. (Which I agree with.)

Originally posted by Varenka
For 40 moves in 2 hours, followed by all other moves in 1 hour, what if White takes just under 2 hours to complete 40 moves, followed by a 30 min think on move 41. You'd expect White to make the initial time control and the clock to show approx 30 mins for White's remaining time in the 2nd time control.

But if the clock "misses a move", it will assume ...[text shortened]... part of the initial time control and not the 2nd. How and when does the error get remedied?

Originally posted by Mad Rook
I've never had this happen to me, but I think this is what should be done. When White's flag falls, this is a case of a premature flag fall (sometimes due to an incorrect setting, but in this case due to missing a move on the clock). If Black claims the time forfeit, White should dispute the claim, due to 40 moves having been reached on the scoresheet. The ...[text shortened]... me forfeit claim.

Edit - For the USCF rules this falls under Rule 16G (Premature Flag Fall)

Originally posted by Varenka
But what if Black, having recorded 40 moves for both sides, realises there will be no flag claim.... decides to go for a stroll due to both players being given an extra hour... and then returns to see that's White's 2nd time control is not being decremented (while White continues to think)?

Then they have to get the TD and try to estimate the time that s ...[text shortened]... to White's clock, etc. etc.

My initial point was to help avoid such confusion and hassle.