Maxima2

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Maxima 1 Maxima ¹

The graph of a 3D paraboloid given by f(x,y) = -(x²+y²)+4, Shown is the global maximum of the surface, at (0,0,4), Selfmade with MuPad, Sam Derbyshire, February 21, 2008, Wikimedia Commons ↩︎

Maxima2,
an UCI compliant open source chess engine by Erik van het Hof and Hermen Reitsma, released under the GPL license. Maxima2 is written in C++ as successor of BugChess aka QueenMaxima. The code has been completely rewritten and modernized using new developments in computer chess from the last decade, with bitboards, LMR, less extensions, more pruning, tapered evaluation, and integrated self-matching test for testing and tuning evaluation values as most notable changes ¹.