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Illegal Move
   

(Moved from WhatIsGoAbout. I'm not aware of any page about Illegal Moves. If there is any, please move them together (legally ;-) )

Andrew Grant: Recently (on 2nd Oct. 2003) Cho Hunhyeon played an illegal? move in a major tournament game and had to forfeit the game.

(Sebastian:) Which illegal move? There aren't many chances to do them in Go!
Andrew Grant: Cho played a non-capturing move on a point with no liberties.

[Diagram]
Cho Hunhyeon 9d v. Choi Cheolhan 5d. Kisung tournament.

Black 1 seems bizarre, but Cho was probably intending to take the ko at a and just played on the wrong point.

It's easy to make this kind of blunder if a ko is involved. Most likely Cho's mind was preoccupied with counting and evaluating ko threats, and he failed to pay due attention to the trivial task of taking the ko.

Something similar happened a few years ago in (I think) the Meijin tournament in Japan, where Cho Chikun took a ko without making a threat. But on that occasion the game was annulled rather than forfeited, since Cho had asked the referee if it was his turn to take the ko and the referee had answered wrongly.



(Sebastian:) Poor guy. I think that Go is too hard-hearted. (Ensuing discussion moved to hard-heartedness)



This is a copy of the living page "Illegal Move" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.