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(c) 1998-2000, matthias kiefer (c) 2005, benjamin meyer (c) 2008-2009, stas verberkt parti dell' algoritmo per il giocatore-computer vengono da xtron-1.1 di rhett d. jacobs
(c) 1998- 2000, matthias kiefer (c) 2005, benjamin meyer (c) 2008- 2009, stas verberkt 电脑玩家的部分算法来自 rhett d. jacobs 的 xtron- 1. 1