From the Hakkapeliitta author:
Hi all. It's time for a new release of Hakkapeliitta. Below you can see the result of a few 60s+0.05s games which should give you some idea about the expected strength level of 3.0.
Rank Name Elo + - games score oppo. draws
1 Hakkapeliitta 3.0 111 6 5 5055 79% -111 21%
2 Hakkapeliitta 2.0 -111 5 6 5055 21% 111 21%
So a nice 220 elo increase. I really hope it stays that way in LTC games. Anyways, there are a huge number of changes from 2.0 so I won't be even trying to list them all, with the exception of adding pondering as that is a user feature, rewriting everything to fix several stupid design decisions (the main one was not being able to check easily if a move is a check before making it), and fixing several big bugs which caused some time losses before. I didn't add large page support like I planned as that is way too much pain to deal with, at least for now. The next version will have multithreading, support for "searchmoves" and "multipv", and it will be at least 50 elo stronger single-threaded as well. However, since multithreading is not easy, the new version won't probably be released for a while.
You can find Hakkapeliitta in the address below:https://github.com/mAarnos/Hakkapeliitta
Only Windows binaries are provided (w32 should work on XP as well) since my Linux virtual machine is acting funny at the moment, but I've added a makefile which can be used to produce binaries on other platforms as well, hopefully (do note that -march=native is used, making binaries compiled on one machine architecture useless to any and all machines with an older architecture).
The binaries provided are quite big, but with dynamic linking, clever compiler options and UPX you can bring the executable size to about 68KB if you really, really want to.
If there are any problems, please let me know.