The Grandmaster's Thinking Process

The first thing a GM does after the opponent's move is ask: "What just changed?" Every move alters the position. A piece moved from one square to another, leaving the old square vacant and occupying a new one. This creates new threats, new weaknesses, and new opportunities.

Specifically, GMs check: Does the opponent's move create any immediate threat? Does it leave a piece undefended? Does it weaken any squares? Does it change the pawn structure? This takes 5-10 seconds, and it prevents 90% of tactical oversights.

Before choosing a move, GMs assess the position. The evaluation follows a hierarchy: material, king safety, piece activity, pawn structure, space. See our complete position evaluation guide.

The evaluation answers one critical question: what kind of move does this position need? If you're attacking, you need a forcing move. If you're defending, you need a prophylactic move. If the position is equal, you need a move that improves your worst piece or creates an imbalance.

GMs don't look at random moves. They generate a short list of 3-5 candidate moves based on the evaluation. The candidates come from pattern recognition: the GM has seen thousands of similar positions and instantly recognises which types of moves work here.

The candidate moves method (from Kotov's Think Like a Grandmaster): list the candidates, then calculate each one to a "quiet position", a position where there are no forcing moves, and evaluate the result. Choose the candidate with the best result.

Calculation is the concrete visualisation of moves and responses. GMs calculate forcing sequences (checks, captures, threats) first, then quiet moves. The depth depends on the position: tactical positions require deep calculation (8-15 moves), positional positions require only 3-5 moves.

Key calculation principles from our calculation guide:

• Calculate forcing moves first (checks > captures > threats)
• Calculate each candidate to a "quiet position"
• Don't go back and forth between lines, follow one to the end before starting another
• Look for the opponent's strongest response, not the one you hope they'll play

After calculating, the GM compares the resulting positions and chooses the move that leads to the best outcome. If multiple moves lead to similar results, the GM chooses the one that is most practical: easiest to play, hardest for the opponent to respond to, and most robust against mistakes.

This is where intuition meets calculation. Sometimes the GM's gut says one move, and the calculation says another. Strong players learn to trust their intuition in familiar positions and their calculation in unfamiliar ones.

Even strong players fall into thinking traps:

• Not checking the opponent's threats: the most common error at every level.
• Confirmation bias: seeing only the lines that support your intended move. See the psychology of blundering.
• Premature evaluation: deciding the position is good/bad before calculating.
• Analysis paralysis: calculating too many lines without deciding. See overthinking in chess.