Reason 1:
I make some analyses with ChessBase GUI and load to the same time on Quad 4 engines: Rybka 3, Rybka 4 an IvanHoe and Houdini 1.03a with 1 core. 94-96% from the moves which comes from Houdini is the same Rybka 4 will play. Normaly are 85 - maximal 90% if you compare different engines.
IvanHoe T0.4 have 86-88% to Rybka 4 and the same to Rybka 3. All 5.000 games I played have the Shredder GUI comments (eval, ply time). Have a look in my download area. So you can do the same, not important which games you select.
Reason 2:
I don't need 6 of this engines for my ratinglist. Most different to Rybka 3 / 4 are playing the IvanHoe versions. Subjektiv impressions by myself, not only produced with statistics.
Reason 3:
Houdini 1.03a produced 38 GUI crashes with ponder = on in 920 games. Same mistake is in FireBird 1.1 with around 58 GUI crashes after 920 games. I need engines which play wihout such problems in my automatic Shredder Classic GUI tournaments. All three IvanHoe versions, Fire 1.31 too don't crash the GUI in 920 games. Works perfectly and stable.
If I have Rybka 4 in my list I don't need an engine which played +- the same moves and make me a lot of trouble with all the crashes.
So the best IvanHoe is qualified.
IvanHoe T0.4 is qualified and the other five are deleted. So I will add frequently new versions by Ahmed (updates) for my SWCR-64.
Only the games from the 5 deleted engines are available in my download selection.
Reason 4:
A little problem from IvanHoe T0.4 is the time mangament ... wrote in the last week a lot to this topic. Yesterday I saw that Ahmed have add an other time mangement, not try yet (perhaps a + from 10-15 ELO if Ahmed make the right changes).
Furthermore, I saw too that IvanHoe T0.4.3 TM is around 10% faster as the version I tested.
I think IvanHoe T0.4.3 TM have around the same level as Rybka 4 / Houdini or is a little bit stronger. So I am sure, I have the right version in my list
I know it if I start my next SWCR-64 tournament.
Best
Frank