

I made this tourney to test the great engine Thinker 5.1C, I'm still awed by its extreme aggressiveness, it makes sound sacrifices that the opponents have trouble understanding, and they are surprised later on to discover that they have a lost game. I also added the Active personality for comparison (Ironically, the Active personality seems more passive.)
I know that the Active one is meant to be only used against humans, but I wanted to see how it fared.
Settings
Athlon 2.1Ghz 32bit
ChessPartner GUI
1'+ 7" with ponder off
64MB hash each engine
No tablebases (Adjudicating games with online tablebases was taking too long)
No books
2 Rounds Gauntlet each Thinker and one match between Thinkers, 60 games
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Think Again (Midway results)
2008.03.17 - 2008.03.22
Score Th AT Gl Fr Sp To Ry Na br
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1: Thinker 10.5 / 16 XX 11 01 01 10 =0 10 11 11
2: ActiveThinker 4.0 / 16 00 XX 00 00 00 10 0= =0 11
3: Glaurung 2.0.1 3.0 / 4 10 11 XX .. .. .. .. .. ..
4: Fruit 2.3.1 3.0 / 4 10 11 .. XX .. .. .. .. ..
5: Spike 1.2 Turin 3.0 / 4 01 11 .. .. XX .. .. .. ..
6: Toga II 3.1.2SE Chekov 2.5 / 4 =1 01 .. .. .. XX .. .. ..
7: Rybka 1.0 Beta 32-bit 2.5 / 4 01 1= .. .. .. .. XX .. ..
8: Naum 2.0 1.5 / 4 00 =1 .. .. .. .. .. XX ..
9: bright-0.2c 0.0 / 4 00 00 .. .. .. .. .. .. XX
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30 games: +15 =3 -12
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Rank Name Elo + - games score oppo. draws
1 Thinker 2865 146 132 16 66% 2752 6%
2 Rybka 1.0 Beta 32-bit 2835 96 90 32 66% 2739 25%
3 Toga II 3.1.2SE Chekov 2826 94 90 32 63% 2740 25%
4 Spike 1.2 Turin 2807 94 91 32 59% 2742 25%
5 Glaurung 2.0.1 2793 95 93 32 56% 2744 19%
6 bright-0.2c 2752 95 95 32 50% 2749 13%
7 Fruit 2.3.1 2704 92 94 32 42% 2755 22%
8 Naum 2.0 2694 91 95 32 41% 2756 19%
9 ThinkerA 2609 131 155 16 25% 2784 13%