1

In this game, the player, who keeps a cool head, wins.

or

In this game, the player who keeps a cool head wins.

when to use comma before who and when not to use comma before who?

  • 1
    To help with readability, there should probably be a comma before "wins" in both sentences. It's not a "required" comma but it can help the reader by showing them that a pause is useful. – Catija Mar 18 '16 at 23:01
2

In your sentences

In this game, the player, who keeps a cool head, wins.
emphasis is on keeping a cool head

In this game, the player who keeps a cool head, wins.
emphasis is on player

In this game, the player who keeps a cool head wins.
emphasis is on wins

Who keeps a cool head is a subordinate clause modifying player, so being offset by commas is appropriate but not necessary.

In this game as the initial phrase, using a comma is appropriate.

The main gist of the sentence

The player ... wins

is the independent clause.

Also appropriate might be

In this game, whoever keeps a cool head wins.

0

In this game, the player, who keeps a cool head, wins.

The sentence means In this game, the player wins. The who keeps a cool head is parenthetical and is extra information telling you that the player referred to keeps a cool head.

In this game, the player who keeps a cool head, wins.

This means that all players who keep cool heads will win.

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