Critter (chess)

Critter is a cross-platform UCI chess engine by Slovakian programmer Richard Vida which is free for non-commercial use. The engine has achieved top five on most official chess engine Elo rating lists.

Richard Vida started working on Critter in late 2008. The first version was originally written in Delphi but the code was later converted to C++ using Bitboard technology because Delphi did not perform well under 64-bit processors. Critter had its over-the-board (OTB) debut at the ICT 2012, where it became a strong runner-up behind the Rybka cluster.