| format | 12-round Swiss | |
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| board size | 19×19 | |
| rules | Chinese | |
| komi | 7 | |
| time | Three hours each, sudden death |
The first round started at 22:00 UTC on March 3rd
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In the table above, Black won 28 games and White won 32. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Zen19S vs nomiBot |
| Moves 191-193 |
In round 1, Zen19S was white against nomiBot. After move 191 in the position
shown to the right, it appeared to me that the large white group in the upper right
was unsettled, and White could win by keeping it alive with, say, a move at 193. But
Zen19S played tenuki with 192, and nomiBot killed the group with 193. It remained
dead, and Zen19S lost the game. I, and a majority of the kibitzers, thought that 192
was a blunder, uncharacteristic of Zen.
However, we were wrong; Zen19S was already in a
poor position when it played 192, which was a good move. Its real blunders had been
earlier, including one which lost its group in the lower right. Zen19S's operator
Hideki Kato explained "The move 192 is not a blunder, but was the best move for
Zen when the winrate had already fallen to 21%. After blunder moves O3, N4 and O14,
the winrate dropped from 68% to 56%, remained constant at 56%, and dropped from 54%
to 16%, respectively. Clearly the first was recoverable, the second was not actually
a blunder, and the third was fatal as N5 would have saved White's O5 group (M7 and P4
are then miai).
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| pachi vs Zen19S |
| Moves 72-74 |
In round 3, Zen19S was black against pachi. In the position to the left, move 72 threatens to kill five black stones and so save the dead white group in the upper right. However Zen19S played tenuki, allowing pachi to play 74 and win the game. 73 is clearly a blunder. Zen19S's operator Hideki Kato reported 'some floating operation error; "value" is "inf"'. He later reported "I ... checked my code and found a bug, which was added in, perhaps, last December".
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| Fuego19 vs CrazyStone |
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Moves 92-106. 98 is at 105. |
In round 7, CrazyStone was black against Fuego19. With moves 92 to 104, it appeared to be trying to save its dead r6 group by chasing some stones in a ladder that did not work. But this gave it a useful ponnuki in the centre of the board; and when it abandoned the failed ladder with a tenuki at 106, it left the black group in the upper right very weak. In fact it went on to kill this group and secure the entire upper right quarter of the board as territory, and win the game. So I guess that when it played the non-working ladder, it "knew what it was doing" and was building up strength which would be effective against the upper right.
Players receive points for the 2013 Annual KGS Bot Championship as follows:
| Crazy Stone | 8 |
| Zen | 4 |
| Aya | 3 |
| pachi | 3 |
| nomitan | 1 |