What do grandmasters do when their opponent plays a non-book move?

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bronsteinitz

They play their best move and then it becomes book theory.

chasm1995

They do whatever move makes them feel warm and fuzzy.  Then, they dominate the game.

chasm1995
pcfilho wrote:

If the opponent is not a master, he/she may offer a draw. Who is crazy enough to deny a draw claim by a grandmaster? ;)

someone too vain and idiotic to accept a draw. Wink