Forty-seventh KGS Computer Go Tournament

Sunday May 31st 2009

These results also appear on an official KGS page which links to the game records.


 Formal division
format12-round Swiss
board size9×9
time4 minutes plus 25/20s


The first round started at 16:00 UTC.



We welcomed a new entrant to these events: Isaac Deutsch's 'Rango'. Rango is a new program, using UCT and RAVE.


I do not intend to comment on the tactics and strategies of the games as much as I have done in the past. They are as interesting as ever, but I have found that, with the bots overtaking me in strength, my comments are likely to be unhelpful. I shall coment only on aspects of the games which do not involve my judgement of the moves.

In round 1, valkyria obtained a won position against AyaMC, but used up most of its time in doing so. When it had less than 10 seconds left, it started making bad moves, and then resigned.

In round 2, valkyria again played slowly against Fuego, using almost a minute on its second move (out of four minutes total). Again it resigned when it had only a few seconds left.

valkyria vs stv
Move 34.
In round 5, the game between valkyria and stv SGF was interesting, with a well-fought ko, initiated by the marked move in the figure to the right. Stv won the ko fight, and the game.

Fuego vs stv
Move 42.
In round 7, Fuego and stv played a strange game, with some very odd moves by both players — the marked move in the figure to the left is an example. My guess is that both players knew by this point that black had lost, and none of the odd moves affected the result. This was stv's first loss.

stv vs Zen9
After both players passed
In the round 9 game betwen stv and Zen9 SGF, both players passed in the position shown to the right. No group has more than one eye, but the black group has more liberties than any of the white groups, and Black should have been able to kill all the white stones. Black indeed claimed that all the white stones were dead, but White did not agree, so the game entered clean-up mode. It apppears that Black, Zen9, did not manage the clean-up, and passed; so this game was scored with all the stones shown counted as alive, making it a win for White by the komi of 7½.

After ten rounds, each player had played each other twice (though not always with the colours reversed, as might be expected). At this point, stv had 9 wins, Fuego 7, Zen19 and AyaMC 5 each, and valkyria 4.

In round 12, stv lost its second game of the tournament, to Zen9.

Processor numbers, power, etc.

Aya, running on Xeon X5355 2.66GHz 2CPU (4 cores on 1CPU, so all 8 cores)
was running on an 8-core 2.66Ghz Xeon.
runing on a 2.4 GHz Intel core 2 duo Macbook Pro
Steenvreter, running on an Intel Core2, Q6600
valkyria, running on Pentium M 1.4GHz
Zen, unstated but probably running on a quad-core AMD Opteron