In the High Book of the Grail, Gawain plays a game of chess immediately after his failure to ask about the Grail and heal the Fisher King:

He looked all around him and saw all the doors shut tight, and then, looking towards the foot of the couch, he could see two candlesticks burning before the chessboard with all its pieces set up; on set was of ivory and the other of gold. Sir Gawain began to move the ivory men, whereupon the gold pieces countered his moves and checkmated him twice. In the third round Gawain hoped to gain revenge, but seeing that he was heading for defeat once more he broke up the game. A maiden then came out of a chamber and bade a boy remove the chessboard and the pieces and take them away. (80)
Selections from The High Book of the Grail. Translated by Nigel Bryant.