Technical Details of Fruit 2.1
Fruit uses the classical Negascout (principal variation search) algorithm with iterative deepening to traverse the game tree. It also uses the null-move heuristic. The original version used a simplistic evaluation function with a robust search. Later versions have improved evaluation functions. The board representation is distinct — Fruit uses a 16x16 board.
As of July 23, 2007, Fruit became freeware. The latest version Fruit 2.3 and Fruit 2.3.1 are free to download on superchessengine.com. Fruit 2.3.1 was one of the top 3 free UCI chess engines.
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