Chess blindness

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Deep Fritz vs. Kramnik
Bonn 2006
a b c d e f g h
f8 white knight
h8 black king
a7 black queen
g7 black pawn
h6 black pawn
e5 white pawn
a4 black pawn
b4 black pawn
e4 white queen
b2 white pawn
g2 white pawn
h2 white pawn
c1 black bishop
h1 white king
7 7
6 6
5 5
4 4
3 3
2 2
1 1
a b c d e f g h
Kramnik, as Black, blunders with 34. ... Qe3??—a classic example of chess blindness. Deep Fritz responds with 35. Qh7#.[1]

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 he has not analyzed at all.