Ziggurat 0.20- " I ported Ziggurat to C#, but the program ran so slowly that it became extremely uncompetitive. However, the port did uncover a few bugs. I have reverted back to the C version."
- added aspiration window in root search
- added PVS/ZWS
- added delta pruning
- fixed a bug in 3-fold repetition
- fixed a bug in end game evaluation parameters
http://mysite.verizon.net/vze16nq0r/id8.html