I would say if you play good moves, you don't need to worry about psychology. So he would need to be better at chess to do so.
Can Sherlock defeat a grandmaster in a chess game?

Sherlock Holmes would know the basics of chess by deduction: Develop, control the centre etc by deduction but wouldn't know openings. He might look at an opponent and see from his manner and clothes he was a recovering alocoholic and perhaps offer to buy him a drink. He might perceive that his opponent keeps looking at his watch and determine he is frightened of upsetting his wife by being late, and Sherlock would play a slow game, perhaps looking at his watch in order to make the other fellow ill at ease.Or he might just see a minute drop of blood on his opponents sleeve, deduce he is the local serial murderer, call the police and claim the game.

Lol good one Ziggy, but what if Sherlock was given a chance to prepare for a week on openings and tactics?
Predicting the opponent's move doesn't mean you've evaluated the position correctly. You can see it all coming and lose anyway if you can't build a good position with your moves.
But to answer the question it depends on where the plot is. Holmes may lose for any number of reasons. For example to show his opponent is clever, or something deeper like using the game as a metaphor for the part of the human experience the author is writing about overall.
He can also win for similar reasons. To have defeated the villain... or to show that Holmes' character is clever.

in the movie Sherlock holmes: a game of shadows, Sherlock plays a brilliant game of chess actually. Soooo, can we assume so? The game is actually posted on Chess.com somewhere in the articles, so maybe try look for it? But I guess Sherlock can just use his pure intellect to win. From what I saw, he can see pretty far ahead before it happens.

You and your silly questions again, nimzomalaysian...
Really? Sherlock vs a GM, a man who spends all his life to play chess at a high level?
Sherlock wins without doubt.

in the movie Sherlock holmes: a game of shadows, Sherlock plays a brilliant game of chess actually. Soooo, can we assume so? The game is actually posted on Chess.com somewhere in the articles, so maybe try look for it? But I guess Sherlock can just use his pure intellect to win. From what I saw, he can see pretty far ahead before it happens.
Here is that blog - https://www.chess.com/blog/SFN/sherlock-holmesa-game-of-shadows
And here is the game he played -
What do you guys think Sherlock's rating might be after going through the game?
If we're talking about the original Sir Arthur Conan Doyle version of Holmes, I wouldn't be surprised to find that he didn't know how to play chess at all, actually.
In the original stories Holmes dedicates his intellect solely to pursuits that directly involve detective work. In one story, Watson was astonished to learn that Sherlock didn't know that the Earth went around the Sun, and that upon hearing that, Sherlock would do his best to forget it as it had no bearing on any case he was working on. He went on to explain that the mind was like an attic, and that to fit more boxes in an attic, other boxes had to go. Playing the violin was his one indulgence. That, and cocaine.

Sherlock Holmes would know the basics of chess by deduction: Develop, control the centre etc by deduction but wouldn't know openings. He might look at an opponent and see from his manner and clothes he was a recovering alocoholic and perhaps offer to buy him a drink. He might perceive that his opponent keeps looking at his watch and determine he is frightened of upsetting his wife by being late, and Sherlock would play a slow game, perhaps looking at his watch in order to make the other fellow ill at ease.Or he might just see a minute drop of blood on his opponents sleeve, deduce he is the local serial murderer, call the police and claim the game.
Hear hear! Well stated indeed!
Sherlock is known for his incredible wit. So, can he beat a grandmaster using intelligence, power of deduction and the ability to read his opponent?
From what we have seen, he may very well be able to predict his opponent's strategy from seemingly trivial piece of evidence.