system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 What level of play can be expected from a Chess Grandmaster?

I know they're super good at chess.  But can someone explain the type of thinking or styles of play that might come from a grand master (and you wouldn't see in players that aren't quite as good)?
gpt
The difference between a good player and a grandmaster is the difference between tactics and strategy.

Games between good players are generally decided by tactics.  Some common tactics are forks (attacking two pieces at once), discovered attacks (moving a piece so the piece behind it can attack), and pins (holding an enemy piece in place).  Generally, they're moves that give good short-term results.

When grandmasters play, it comes down to strategy.  Yes, the tactics still matter, but both sides know them all very well.  Instead, it's about the long game.  There's a lot of focus on control of rows, columns, and diagonals.  You also tend to see lots of moves that don't serve any immediate purpose, but which set up combinations of strong moves that lead into each other.  When that works right, you see games go from evenly balanced to overwhelmingly one-sided in a very short time frame.