The clock is not only counting down. It is asking a question:

Is this position worth more of my time?

I often answer by mood. A familiar position gets an instant move. An uncomfortable position gets a long think. A position that looks tactical can consume several minutes whether or not calculation changes anything.

That is not quite the same as spending time where it can improve the decision.

When thinking can find something

A 2025 study, Exploring Resource-Rational Planning Under Time Pressure in Online Chess, compared how Lichess players handled positions across different time controls and amounts of remaining clock time.

The researchers distinguished between positions where deeper calculation could reveal a better move and positions where it did not change the engine’s preferred move. Players spent more time when more time was available, but the useful result was narrower: extra time produced better moves in the position where further calculation had something to discover. It did not improve move quality in the position where the obvious move was already good.

More time was not automatically better. More time was better when there was a better answer to find.

The study deserves a modest reading. Its controlled comparison focused on two frequently occurring positions, and Stockfish evaluations stood in for move quality. It does not hand us a universal formula for clock management. It does give a useful name to the thing I want from a long think: value.

A practical trigger

During my next serious games, I want to reserve time for positions with at least one of these signals:

  • a forcing move for either player;
  • a choice that changes the pawn structure;
  • a possible exchange of queens or entry into an endgame;
  • several plausible candidate moves with different plans;
  • or a move that cannot be taken back, such as a pawn push or sacrifice.

If none of those signals appears, I still need a blunder check. I may not need a five-minute investigation.

This also changes how I review a game. Instead of asking only, “Where did I spend too much time?” I can ask two separate questions:

  1. Where did I spend time without improving my decision?
  2. Where could another minute realistically have changed my move?

The first question finds waste. The second finds the moments I failed to recognize as important.

Time management is not the art of moving quickly. It is the art of noticing when thought is likely to pay rent.