Amaurosis scacchistica

Amaurosis scacchistica (Latin for chess blindness) is the failure of a chess player, during a chess game, to make a normally obvious good move or see a normally obvious danger. The term was coined by Dr. Siegbert Tarrasch. Similar to chess blindness is the Kotov syndrome, in which a player, after a long period of calculation, suddenly makes a move they have not analyzed at all.