[Computer-go] Semeais

[Jacques Basaldúa]

There was another nice example in the last Tournament.

http://files.gokgs.com/games/2011/1/9/PueGo-pachi2.sgf

Fuego was leading easily (>70% according to its own WR)
until move 189.

Imo, move 190 White  ..   T7 is a big mistake allowing
B to play 191 Black  M13. After this move the semeai
is won for B and pachi easily wins the game.

I ran fuego up to 3Msims and it is obstinated with
190 .. t7. Even gnugo plays this correctly. It plays
q14 which is nothing, but is at least kikashi. After
r14 (which was forced by q14) it plays m13 correctly
keeping W's advantage and easy win in the game.

Gnugo 3.7

190 White  ..  Q14  (Cap. by B: 4, by W: 6)
191 Black  R14  ..  (Cap. by B: 4, by W: 6)
192 White  ..  M13  (Cap. by B: 4, by W: 6)

Of course, stronger players (I am 2k) may improve this
analysis or find a different spot where the game turned
from an easy W win to an easy B win.


Jacques.