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A blunder (poka in Japanese) is a mistake of which one feels it is way below one's level. A blunder is often a result of Go blindness, a situation in which you fail to see what is thud-simple when pointed out to you.

Blunders happen to people at all levels of Go playing strength. Fujisawa Shuko, the great Japanese pro, was famous for poka or blunders. He lost the Kisei title to Cho Chikun because of one.

Cho(W) vs. Fujisawa(B)  

Here is the position after 149 moves of [ext] game 7 of the 7th Kisei title match between Cho and Fujisawa.

Cho's move 148 was at the marked white stone and Fujisawa responded at the marked black stone. In a commentary in issue 31 of Go World magazine, Cho himself called the marked black stone a silly blunder that loses the game. Instead, playing at B1 in the following diagram was recommended, which would have led to a close game[1], perhaps a half-point decision.

Cho(W) vs. Fujisawa(B)  

If White plays W2, Black easily lives with B5.

The actual game proceeded as follows, with White storming through Black's position.

Cho(W) vs. Fujisawa(B)  

[1] Robert Pauli: It was a close game: W+1.5

See also

Incidentally, poka was the (appropriate) name of an early Go playing program that did no reading, written by Howard Landman.

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Blunder last edited by Dieter on June 20, 2014 - 11:40
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