WhiteWhale is a nanobot. It builds on the work from NanoInterpreter.
The robot is in the RoboRumble.
NanoRumble - APS: 77.96% (1st), PL: 147-4 (1st), Survival: 89.87%
The current source code can be downloaded from http://sites.google.com/site/dcvqksyb/robocode/kinsen.nano.WhiteWhale_1.0_src.jar.
The robot understands a very small set of instructions: set, get, subtract, divide, if, call, and characterToInteger (CMD_SET, CMD_IF, CMD_SUBTRACT, CMD_DIVIDE, CMD_IF, CMD_CALL, and CMD_LITERAL). This instruction set provides the foundation for basic mathematical expressions. The expressions use prefix notation (e.g. + 5 2 instead of 5 + 2).
WhiteWhale has a large, but limited memory. The calls to Java functions are stored in STRING_TABLE and the commands are stored in COMMANDS.
The nanobot cannot do anything object-oriented. There is no way to instantiate arbitrary objects.
The architecture has proven to be a bit controversial.
The interpreter robot is quite speedy due to various neat tricks, which you'll have to read the code to find out for yourself. :) Let's just say that it wasn't exactly a fast bot for a very long time.
As far as the nanorumble goes, WhiteWhale beats all the bots except for 1.