Take a recent master game (e.g., from the 2024 Candidates Tournament). Stop at the move where one player spent >15 minutes thinking.
Calculation is often associated with flashy middlegame tactics, but GMs know that the hardest calculation occurs in endgame transitions. Creating PGNs of complex endgame conversions—where technique meets calculation—is a trendy new focus. These are positions where there are no immediate checkmates, but a sequence of 10-15 precise moves is required to convert an advantage. grandmaster preparation calculation pgn new