Life In 19x19

Thank you for the informations.

See here ( https://www.lifein19x19.com/viewtopic.p ... 03#p261003 ) for the thermographs of this position and positions in its game tree.

Thermography is a method for finding the count of a position, how much each play gains, and possibly other information about it.

An easy one, but one that most people may not think about.



How much does gain, on average?

I will say 2/3 of a point.

By filling at B-19 and then at A-18 Black reaches a local score of 0 in the corner in 2 plays. White to play takes the ko with sente and after Black fills at B-19 to save two stones White can fill the ko for a local score of -1 with 1 net play. As with a simple ko the difference between winning it and losing it is 1 point in 3 net plays. The average gain per play is thus 1/3 point.