These executables have a very simple UNIX-like command line user interface. basicsimbj: the same as simbj but for the basic strategy.simbj: simulation of a Blackjack player using the best strategy.basicbbjd: the same as bbjd but for the basic strategy.bbjd: tool to calculate probabilities and expectations interactively.This software was written in C in 1992 during my studies of physics for a seminar about probability calculations. As far as I know, Blackjack is the only game offered by casinos, where this has been mathematically proven. The software used to generate the charts, as shown under strategy can be downloaded here. This software can be used to prove that by playing Blackjack, it is possible to beat the dealer on the long term under certain conditions.