sirius

Sirius is a program for playing the game of reversi. The program includes an AI (Artificial Intelligence) opponent which plays at a very challenging level and is actually quite hard to beat. The AI opponent's strength can therefore be adjusted in several ways to give you a suitable opponent. The AI opponent uses a plain alpha-beta search with hashing to figure out which move to make. To be able to tell a good position from a bad one, it uses a pattern based evaluation function. The pattern used is the 9 discs surrounding each corner and the 8 discs creating the edge of the board. The evaluation function also takes mobility, potential mobility and parity into count. For the initial 9 moves the AI opponent optionally uses a simple opening book. During midgame it searches and evaluates about 200.000 nodes per second on a PIII 750 MHz, in the endgame this number is significantly higher due to more transpositions and a less expensive evaluation function.

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