KCEC
(Kirr's Chess Engine Comparison)
A tournament of original free chess engines
June 16, 2013
Testing summary:
Total: 135,679 games
played by 202 programs
1398 CPU days (X2 4600+)

White wins: 55,227 (40.7%)
Black wins: 47,434 (35.0%)
Draws: 33,018 (24.3%)
White score: 52.9%

Engine Details

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Show each game results
Ruffian 1.0.5 UCI#21  (2687+17
−17
)Quote
Author: Per-Ola Valfridsson (Sweden) Released: 2003-03-19Links: Homepage, Arena
1.0.5 is the last free version of Ruffian.
This engine is stable and runs without issues.
This is the only Ruffian version we tested.
OpponentEloDiffResultsScoreLOSPerfPond
hit
Eval
diff
–   Fruit 2.3 32-bit2888+23
−23
(+201)3.5 − 24.5
(+0−21=7)
12.5%
3.5 / 28
0.0%
−87
59.6%
2070
0.54
1234
0 0 0 = 0 0 0 0 = 0 0 0 = 0 = 0 = 0 0 0 = 0 0 0 0 0 0 =
–   Spike 1.2 Turin2842+23
−23
(+155)9.5 − 22.5
(+2−15=15)
29.7%
9.5 / 32
0.0%
+32
58.3%
1679
0.61
979
= 0 0 = 0 0 0 = = = = 0 = = 0 0 0 0 0 0 = 1 = = 0 = = 0 = 1 0 =
–   Glaurung 2.0.1 64-bit2838+23
−23
(+151)8.5 − 14.5
(+5−11=7)
37.0%
8.5 / 23
0.0%
+61
56.6%
1404
0.70
794
= = 0 0 0 1 = 1 0 = 0 = 0 = 1 0 0 0 = 0 1 1 0
–   Delfi 5.42801+24
−24
(+114)10 − 22
(+5−17=10)
31.3%
10.0 / 32
0.0%
−14
57.1%
1807
0.52
1031
0 0 0 0 = 0 1 0 = 0 0 0 = = 1 0 1 = = 1 0 = = 0 1 = 0 0 0 0 0 =
–   Naum 2.0 64-bit2793+21
−21
(+106)9.5 − 22.5
(+5−18=9)
29.7%
9.5 / 32
0.0%
−35
56.9%
2086
0.63
1186
0 0 1 = = 0 1 0 = 0 0 1 1 0 0 = 0 0 = 0 0 0 = 0 0 0 0 = 1 = = 0
–   Bright 0.2c2786+23
−23
(+99)11 − 15
(+5−9=12)
42.3%
11.0 / 26
0.0%
+55
54.8%
1538
0.65
843
0 = = 1 = = 0 = 1 1 = = = 0 0 = = = 0 0 1 1 0 0 = 0
–   Naum 2.0 32-bit2777+26
−26
(+90)11.5 − 20.5
(+10−19=3)
35.9%
11.5 / 32
0.0%
−24
60.0%
2846
0.62
1708
0 0 0 0 0 0 1 0 1 0 0 0 1 1 0 0 = 1 0 0 1 0 0 0 = 0 1 = 1 1 0 1
–   Glaurung 1.2.1 64-bit2770+24
−24
(+83)11 − 21
(+8−18=6)
34.4%
11.0 / 32
0.0%
−34
56.9%
2429
0.61
1381
= 0 0 1 0 = 1 0 1 0 1 = = = 0 0 0 0 0 0 0 0 0 0 1 1 0 1 = 0 0 1
–   Alaric 7072768+22
−22
(+81)9.5 − 18.5
(+5−14=9)
33.9%
9.5 / 28
0.0%
−30
56.0%
2079
0.59
1165
0 = 0 = = 0 0 1 0 0 0 0 = = 0 = 0 = 1 1 = 0 = 1 0 1 0 0
–   Scorpio 2.0 32-bit2754+23
−23
(+67)13.5 − 15.5
(+7−9=13)
46.6%
13.5 / 29
0.0%
+45
62.8%
1521
0.64
955
0 0 = 0 = = 1 1 = = 1 0 1 1 = = = 0 1 0 = 1 = 0 = = 0 0 =
–   Scorpio 1.912739+26
−26
(+52)12 − 16
(+8−12=8)
42.9%
12.0 / 28
0.0%
0
61.9%
1865
0.61
1155
1 1 = 0 1 0 = 0 = 1 1 0 0 0 0 = 0 = 0 = 0 = 1 0 1 1 = 0
–   E.T. Chess 13.01.082733+21
−21
(+46)10.5 − 15.5
(+5−10=11)
40.4%
10.5 / 26
0.0%
−10
57.6%
1645
0.48
948
= 0 0 = 1 = 0 = 0 1 = 0 = 0 = 0 0 1 = 0 = = 0 = 1 1
–   WildCat 82730+22
−22
(+43)16 − 16
(+11−11=10)
50.0%
16.0 / 32
0.0%
+41
57.6%
2121
0.52
1221
= 1 = = 0 0 1 1 0 1 0 = = = = 1 1 0 1 = 1 1 0 = 1 0 0 = 0 0 0 1
–   Alfil 8.1.1 Optimized2723+21
−21
(+36)12.5 − 12.5
(+7−7=11)
50.0%
12.5 / 25
0.2%
+33
57.2%
1357
0.66
776
1 = 0 0 0 = 0 = = = 1 = 0 1 0 0 1 1 = = = 1 = = 1
–   Movei 00.8.438 (10-10-10)2722+21
−21
(+35)10 − 17
(+5−12=10)
37.0%
10.0 / 27
0.2%
−46
58.5%
1458
0.58
853
1 0 = = 0 0 1 = 0 0 0 = 1 1 = = = 0 = = 1 = 0 0 0 0 0
–   Pro Deo 1.62719+22
−22
(+32)14 − 14
(+10−10=8)
50.0%
14.0 / 28
0.6%
+35
56.8%
1917
0.71
1089
= = 1 = 0 = 0 0 1 = 1 0 1 1 0 0 1 1 0 1 0 = 1 0 = = 1 0
–   Delfi 5.22718+21
−21
(+31)9.5 − 17.5
(+6−14=7)
35.2%
9.5 / 27
0.6%
−74
57.6%
2278
0.56
1311
0 1 1 1 0 0 = = 0 0 1 = 0 = = 0 0 0 1 0 0 = 0 1 0 = 0
–   WildCat 72718+19
−19
(+31)11 − 16
(+6−11=10)
40.7%
11.0 / 27
0.4%
−33
59.5%
2019
0.52
1201
= 1 1 = = 0 0 0 = 0 1 1 0 = = 1 = 1 0 = 0 = 0 0 0 0 =
–   Zappa 1.1 64-bit2717+19
−19
(+30)13 − 19
(+8−14=10)
40.6%
13.0 / 32
0.4%
−31
59.1%
2247
0.69
1327
= 0 = 1 = 1 = 1 = 0 0 1 1 = 1 0 0 0 0 1 0 = 1 0 0 0 0 0 = 0 = =
–   Slow Chess Blitz WV2.12716+19
−19
(+29)15 − 17
(+10−12=10)
46.9%
15.0 / 32
0.7%
+8
61.2%
2406
0.43
1473
= 1 0 0 1 = = 1 1 1 = 0 0 1 0 1 0 0 1 1 = 0 0 = 1 = 0 = 0 = = 0
–   Alaric 7042713+26
−26
(+26)11 − 16
(+6−11=10)
40.7%
11.0 / 27
4.2%
−29
58.9%
1854
0.54
1092
= 0 0 0 0 = 0 0 1 1 0 1 = = 1 = 1 = = 0 = 0 1 = = 0 0
–   Frenzee 3.0 64-bit2711+19
−19
(+24)11.5 − 14.5
(+7−10=9)
44.2%
11.5 / 26
2.1%
−19
58.0%
1585
0.60
919
1 = 1 0 0 1 0 = = 0 0 0 1 = 0 = 1 = 0 = 0 1 0 1 = =
–   Colossus 2007d2707+20
−20
(+20)12.5 − 13.5
(+7−8=11)
48.1%
12.5 / 26
5.0%
+6
60.6%
1551
0.46
940
= = 0 = 1 0 = = 0 1 1 1 0 0 1 = = 1 = = = 0 0 0 = 1
–   Pharaon 3.5.12704+19
−19
(+17)19 − 13
(+15−9=8)
59.4%
19.0 / 32
7.1%
+83
60.6%
2650
0.55
1607
1 = 1 1 1 1 = = 0 0 1 1 1 1 = = 0 = 0 0 1 1 1 0 = 1 0 1 = 0 1 0
–   List 5.122699+18
−18
(+12)15 − 14
(+9−8=12)
51.7%
15.0 / 29
15.7%
+20
62.0%
1438
0.51
891
= = = 1 0 1 0 = 0 = 0 1 1 = = 1 = 0 0 = = 0 1 = = 1 0 1 1
–   SOS 5.12697+18
−18
(+10)15.5 − 16.5
(+10−11=11)
48.4%
15.5 / 32
20.4%
−1
57.4%
2035
0.64
1169
= 0 = = = 0 0 1 1 0 1 0 1 = 1 0 = = 1 0 = 1 0 0 1 = = 0 1 0 = 1
–   Colossus 2007c2694+19
−19
(+7)10 − 14
(+6−10=8)
41.7%
10.0 / 24
29.2%
−46
59.2%
1621
0.43
960
= 0 = 0 0 0 0 1 1 1 0 = 0 1 = = 0 0 1 1 0 = = =
–   Petir 4.392682+18
−18
(−5)11 − 14
(+7−10=8)
44.0%
11.0 / 25
69.7%
−44
58.6%
1730
0.50
1013
0 0 0 = 0 0 0 0 0 1 = = 1 1 1 = 1 0 = 1 = = 1 0 =
–   Pseudo 0.7c2680+18
−18
(−7)18 − 14
(+12−8=12)
56.3%
18.0 / 32
74.7%
+32
61.4%
2033
0.49
1249
= 1 1 = 1 1 1 = 0 = = 1 0 = = 1 = 0 0 0 0 1 = = 1 = = 1 1 1 0 0
–   Aristarch 4.502671+18
−18
(−16)16.5 − 11.5
(+13−8=7)
58.9%
16.5 / 28
93.2%
+43
60.3%
1333
0.66
804
0 1 1 1 1 1 0 1 1 1 = 0 = 0 0 0 0 0 = 1 = 1 = 1 1 = 1 =
–   Petir 4.9999992670+19
−19
(−17)14.5 − 8.5
(+12−6=5)
63.0%
14.5 / 23
93.8%
+78
62.9%
1745
0.76
1098
1 = 0 1 1 1 1 1 0 = 1 1 0 1 1 1 = 0 = = 0 0 1
–   Hamsters 0.62669+18
−18
(−18)14.5 − 12.5
(+9−7=11)
53.7%
14.5 / 27
94.3%
+7
59.7%
1532
0.56
915
1 0 = = = 1 1 0 0 = = = = = 1 0 0 1 1 = 0 = = 1 0 1 1
–   The Baron 2.23 64-bit2669+19
−19
(−18)19 − 13
(+16−10=6)
59.4%
19.0 / 32
94.3%
+52
57.2%
2184
0.70
1250
0 1 1 = 0 1 0 1 = 0 0 = 1 1 1 0 1 1 1 0 1 = = = 1 1 0 0 1 1 1 0
–   Booot 4.13.12668+18
−18
(−19)14 − 13
(+8−7=12)
51.9%
14.0 / 27
96.1%
−8
57.9%
1355
0.47
784
0 1 1 0 = 0 0 = 0 0 = = 1 1 = 1 = = 1 1 = 0 1 = = = =
–   BugChess2 1.5.22661+18
−18
(−26)11.5 − 12.5
(+8−9=7)
47.9%
11.5 / 24
99.0%
−43
56.1%
1625
0.63
911
= = 1 1 0 1 = 1 1 0 = 0 = 0 0 0 0 1 0 1 = 1 0 =
–   Jonny 2.832652+17
−17
(−35)20.5 − 11.5
(+16−7=9)
64.1%
20.5 / 32
99.9%
+60
55.3%
2365
0.68
1308
0 = 1 = 0 1 0 = = 1 0 1 1 1 1 1 1 = 1 = 1 1 0 = 0 1 = 1 0 1 = 1
–   Crafty 21.5 64-bit PS2652+17
−17
(−35)13.5 − 15.5
(+6−8=15)
46.6%
13.5 / 29
99.9%
−53
60.3%
1268
0.57
764
= 0 1 = 1 0 = 0 = = 0 1 = 0 = 1 1 0 = 0 = = = = 0 = = 1 =
–   The Baron 1.8.12651+18
−18
(−36)15 − 13
(+11−9=8)
53.6%
15.0 / 28
99.9%
−11
57.0%
1756
0.67
1001
= 1 = 0 = 0 0 0 1 1 0 1 1 0 0 1 1 = 1 = 0 = = 1 1 1 = 0
–   Anaconda 2.0.12644+17
−17
(−43)15.5 − 13.5
(+10−8=11)
53.4%
15.5 / 29
100.0%
−20
61.6%
2000
0.48
1233
0 0 = = 1 0 1 1 0 1 = 1 1 0 1 1 0 0 = = = 1 = = = = = 1 0
–   Movei 00.8.4032643+22
−22
(−44)13 − 15
(+8−10=10)
46.4%
13.0 / 28
100.0%
−64
57.1%
1638
0.51
936
0 0 = 1 1 1 = 1 0 = 1 0 0 1 1 = 0 = 0 = = = 0 0 = = 0 1
–   Fritz 5.322643+17
−17
(−44)10 − 16
(+6−12=8)
38.5%
10.0 / 26
100.0%
−119
57.8%
1633
0.71
944
1 0 = 0 = 0 1 0 = = = 0 = 0 0 0 0 1 = 1 = 1 0 0 1 0
–   Ktulu 4.22634+17
−17
(−53)19 − 10
(+15−6=8)
65.5%
19.0 / 29
100.0%
+59
62.8%
2140
0.46
1344
1 = 0 1 1 = = 0 1 1 1 0 0 1 1 = 1 0 = 1 1 1 = 0 1 = = 1 1
–   Thinker 4.7a2634+17
−17
(−53)18.5 − 9.5
(+12−3=13)
66.1%
18.5 / 28
100.0%
+44
61.8%
1553
0.73
959
= 1 = = = = 1 = = 1 = 0 0 1 = 1 1 1 = 1 1 = 1 0 1 = = 1
–   SmarThink 0.17a2633+16
−16
(−54)14 − 18
(+9−13=10)
43.8%
14.0 / 32
100.0%
−97
54.4%
2386
0.67
1298
1 1 = 1 = 1 0 1 1 = 1 0 0 0 1 0 0 0 = 0 = 1 0 = 0 0 = 0 = = 0 =
–   Ufim 8.022628+18
−18
(−59)13 − 12
(+9−8=8)
52.0%
13.0 / 25
100.0%
−43
54.0%
1853
0.78
1001
1 = 1 1 = 1 = 1 1 = = 0 0 0 = 0 = 0 0 = 0 1 1 1 0
–   Trace 1.37a2622+17
−17
(−65)21.5 − 5.5
(+20−4=3)
79.6%
21.5 / 27
100.0%
+181
58.0%
2451
0.54
1422
1 1 1 = 0 1 1 0 1 1 1 1 1 0 1 1 1 1 1 = 1 0 1 1 = 1 1
–   AnMon 5.602621+18
−18
(−66)16 − 13
(+11−8=10)
55.2%
16.0 / 29
100.0%
−32
59.8%
1533
0.60
916
0 = = 1 1 = 1 0 1 = = 0 = = 0 0 = 1 = 1 1 0 1 1 0 = 1 1 0
–   E.T. Chess 18.11.052620+21
−21
(−67)11 − 5
(+7−1=8)
68.8%
11.0 / 16
100.0%
+4559.3%
648
0.68
384
= 1 1 0 1 = = 1 = 1 = 1 = = 1 =
–   Little Goliath 3.12 Evolution (TB Off)2614+17
−17
(−73)18.5 − 8.5
(+14−4=9)
68.5%
18.5 / 27
100.0%
+53
56.3%
1649
0.81
928
0 1 = = 0 1 0 1 1 1 1 1 = 1 0 1 = 1 1 1 1 = = = = 1 =
–   Yace 0.99.872609+17
−17
(−78)15.5 − 9.5
(+11−5=9)
62.0%
15.5 / 25
100.0%
−3
58.7%
1472
0.63
864
1 0 = 0 1 1 1 1 = 1 0 0 = 1 1 = 0 1 = = 1 = 1 = =
–   Little Goliath 3.12 Evolution (TB On)2607+19
−19
(−80)17.5 − 8.5
(+14−5=7)
67.3%
17.5 / 26
100.0%
+39
55.5%
1928
0.73
1071
= = 1 1 = 0 = = 1 0 1 = 1 1 = 0 1 1 1 1 1 0 1 0 1 1

Performance

This figure shows how this engine performs depending on how strong is the opponent. Regression:

Perf = C − 0.095 [±0.229] * Opp

Where 'Opp' is the opponent's rating. 95% confidence intervals are in the brackets.

Rating changes by day

Rating changes with played games


Created in 2005-2012 by Kirill Kryukov
Updated on June 16, 2013