2006-04-28 last update, 2006-04-28 first day, Robert Jasiek


INDEX | GO | RULES |

Important Mistakes in Rules Design Made in the Past

General Mistakes

Particular Mistakes

Ko Rules



Example: Japanese 1989 Rules, Black to move:

# # # # #
. # O # .
# O . O .
O O O O O

Black cannot know whether he should create a double ko seki or a triple ko. The rules leave it unclear which, if any, is better.


Too Frequent Pass Fights



Example: Trying to simplify the American Go Association 1991 Rules by omitting the "White moves last" rule while using Territory Scoring. Black to move, no prior pass, no prior prisoner:

. # # # #
# # # . .
O O O # #
O . O O O
. O . O .

Black passes, White throws in, Black captures, White passes, Black passes is a possible perfect play move-sequence and leads to the score -2. The pass fight is about passing first in the ending succession of passes.