On the mobile platform, I think SmallFish (Stockfish) is your best friend.

A brand new candidate for the best analysis engine:

Komodo 5.1 multi-processor (commercial) - at last 
Released 17 of June, 2013
http://komodochess.com/komodo51mp-32a

Houdini would be most peeps top vote

Markovich wrote on 01/09/13 at 03:04:31:

Maybe, you would have to see a3 (threatening to trap the queen) to force the queen back, and then Qe1, and then evaluate the position correctly.
However, like most tactical positions it is a lot easier to see when you know there is a tactic to be found!

Quote:


Sorry Tony, that's the one I meant! My PC is pretty fast, so I guess we can conclude H3 is significantly better ...

fling wrote on 01/08/13 at 22:20:24:


Well, let's see!

One engine? - Houdini 3 (commercial).
Two engines? - ... + Stockfish 2.3.1 (free) - sometimes better in closed positions..
Three engines? - ... + Houdini 1.5a (free) - more reliable for an analysis in depth.
Four engines? - ... + Critter 1.6a (free) - sometimes better in endgames' analysis and the second best after Houdini, in fact.
Five engines? - ... + Komodo 5 (commercial) - sometimes giving some good analysis lines (ideas), different from others, because of its unique method of evaluation.
Six engines? - ... + Ivanhoe B46 (free) - just like Komodo 5.
Seven engines? - ... + Deep Rybka 4.1 (commercial) - because of pure nostalgia, maybe.. Or, just because it's good.
Eight engines? - ... + Zappa Mexico II (commercial) - because of its unique "dissident aggressor" options for solving tactical positions that Houdini 3 "tactical mode" won't solve.
Nine engines? - ... + Critter 0.90 (free) - good for some endgame analysis and closed position analysis, too.
Ten engines? - ... + Deep Fritz 10 (commercial) - once it was a great program, you know. And the most "human" engine I have ever seen.. 

But, let me stop here! Otherwise I would be tempted to mention Deep Hiarcs 14, Vitruvius, Fire 2.2 xTreme and so on...but for no reason. 

By the way, one big improvement in Houdini 3 is the so-called "tactical mode".
What it means?
It means that one can prepare Houdini 3 for highly tactical positions just by checking the option "tactical mode" in the engine parameters menu before doing an analysis.
According to some testers, it solves tactical studies up to 30 per cents better (and faster) than the Houdini 3 in classical mode. These results rank the engine among the best ones in tactics.
I often try this option in my correspondence chess tries. And I can say I'm very impressed by the results, too.. 
Meanwhile, some testers ran matches between Houdini 3 and Houdini 3 "tactical mode". What is amazing is that Houdini 3 "tactical mode" is just a bit weaker in playing strength. Usually, engines don't play very well in tactical mode, because they're somehow "twisted" in parameters. Not Houdini 3 "tactical mode" though. Still it can win a match against any of the best engines available. 

That's impressive! My humble Houdini 1a takes fully 5.75 seconds!