More Details:• TTs ranking is a quite good indicator of which are the best engines for tactics * To be honest, I see my current TTs testing to be similar as IQs testing !) • I preferred 600 test positions, which mostly of them can be called 'Tactical' * I consider to publish my used EPD database after when X engine will pass Houdini 4's points • For more reliable standings: the Top 3 chess engines are tested twice * After repeating the same chess engine version: usually the difference is 1 point  • I plan to continue working over this project, but mainly with +2200 Elo and above... * Due to many amateur engines (weaker than 2200 Elo) have serious bugs in analyze mode • If some +2200 Elo engines are missing in TTs ranking, then with a big possibility: - Those ones have bugs during analyzing or simply they don't support analyze mode 
• TTs official ranking includes only (since 30.08.2015) :1) Public and strongest engine versions2) Engines, which are up to 55% similarity (+56% out)* Exception there will be for:- Private engines, in case of better performance than the leader (Houdini 4)- Derivative engines: in case of +20 points better than based original engine- Clone engines: in case of +100 points better than based original engine* Houdini 4 (based mainly on Rybka) managed to do that...why not other engine?!* Otherwise, TTs standing will be based mainly on Stockfish / Rybka derivatives or clones 
* Some useful sim test results, which are with +55% similarity to Stockfish and Rybka:
sim version 3 ------ Stockfish 140614 SSE4.2 (time: 100 ms  scale: 1.0) ------ 65.02  Taipan 5 (time: 100 ms  scale: 1.0)  60.52  Stockfish 6 64 POPCNT (time: 100 ms  scale: 1.0)  60.18  DON 020115 x64 (time: 100 ms  scale: 1.0)  59.10  Sugar v4.2 x64 SSE4.2 (time: 100 ms  scale: 1.0)  58.27  Heron imp. 231113 X64 Normal (time: 100 ms  scale: 1.0)  55.96  Stockfish 2.1 JA 64bit (time: 100 ms  scale: 1.0)  55.84  Stockfish 2.1 JA 64bit (time: 50 ms  scale: 1.0)  55.51  Ginkgo 1.0e (time: 100 ms  scale: 1.0)  55.34  Sting SF 4.8.2 64bit (time: 100 ms  scale: 1.0)  55.00  Protector 1.8.0 (time: 100 ms  scale: 1.0)  s
sim version 3 ------ Rybka 3  (time: 100 ms  scale: 1.0) ------  61.79  RobboLito 0.085g3 w32 (time: 100 ms  scale: 1.0)  61.09  Tankist 3.1 32-bit (time: 100 ms  scale: 1.0)  60.61  LEOpard 0.7c (time: 100 ms  scale: 1.0)  60.27  Firenzina 2.3.1 xTreme x64 (time: 100 ms  scale: 1.0)  60.00  IvanHoe-Beta 999946h6 x64 Tr (time: 100 ms  scale: 1.0)  59.64  IPPOLIT 0.080b3 x64 (time: 100 ms  scale: 1.0)  59.18  Elektro 1.0 (time: 100 ms  scale: 1.0)  59.08  PanChess 00.250 x64 (time: 100 ms  scale: 1.0)  58.98  Bouquet 1.8 x64 (time: 100 ms  scale: 1.0)  58.95  DeepSaros Human (time: 100 ms  scale: 1.0)  58.76  Fire 3.0 x64 (time: 100 ms  scale: 1.0)  58.45  BlackMamba 2.0 x64 (time: 100 ms  scale: 1.0)  57.66  Critter 1.6a 64-bit (time: 100 ms  scale: 1.0)  57.65  Equinox 3.20 x64mp (time: 100 ms  scale: 1.0)  57.00  Naum 4.6 (time: 100 ms  scale: 1.0)  56.98  Murka 3 x64 UCI (time: 100 ms  scale: 1.0)  56.79  Strelka 6 w32 (time: 100 ms  scale: 1.0)  56.48  Houdini 4 x64 (time: 100 ms  scale: 1.0)  55.49  Gull II x64 (time: 100 ms  scale: 1.0)  55.39  Belka 1.8.20 (time: 100 ms  scale: 1.0)  55.12  Critter 0.90 64-bit SSE4 (time: 100 ms  scale: 1.0)
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