---

Dear Chess Friends,

My final words over this issue...

The bellow 2007/2008 data is based on handicapped games played by Rybka (without pawn) vs GMs average 2600 Elo



Dzindzichashvili vs Rybka
4.0 - 4.0 8 games
2.5 - 1.5 4 games
http://en.wikiped...ichashvili

-----------------------------------------------------
Rybka: 4.5
Benjamin: 3.5
http://rybkaforum...l?tid=1883

-----------------------------------------------------
Rybka: 10.0
Ehlvest: 4.0
http://en.wikiped...an_Ehlvest

-----------------------------------------------------

More Details (based on my testings):

Rybka 3 using a strong opening book performed approx. +200 Elo better than without using book
http://sedatchess...php?p=1_35

[tt]Rank Name Elo + - games score oppo. draws
01 Ultra Blitz 3 3319 23 23 560 60% 3257 50%
70 NoBook 3100 25 25 460 37% 3176 53% [/tt]

*Note:NoBook is empty.ctg (Rybka 3 is played without using any opening book)

-----------------------------------------------------

Rybka with Full Performance (with all pieces) performed approx. +250 Elo better
http://www.sedatc...t-auto232/

[tt]Rank Name Elo + - games score oppo. draws
36 Rybka 4.1 x64 1c 3201 13 13 1725 48% 3217 49%
52 Rybka 4.1 WP x64 1c 2954 29 29 470 61% 2875 27%
[/tt]
*Note:Rybka 4.1 WP x64 1c is played without using a full pawn

-----------------------------------------------------

In my estimation (based on the above data/sources)
1)Rybka +75 Elo
2)Private Strong Book / Endgames +150 Elo
3)Faster Hardware +150 Elo
4)Newer/Stronger version +150 Elo
5)Full Performance (with all pieces) +250 Elo
-----------------------------------------------------
FINAL CONCLUSION:
-Rybka 4.1 mp (on 2x Intel Xeon X5667 @ 4.60GHz)is expecting to be rated approx.750-800 Elo stronger than GMs of 2600 Elo points

Best Regards,
Sedat Canbaz