Critter (chess)

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Developer(s) Richard Vida
Stable release
1.6a 64-bit / June 2012
Development status Inactive
Written in C++
Operating system Microsoft Windows, Mac OS X, Linux, Android
Type Chess engine
License Proprietary

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.[1][2][3][4]


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.[5][6] Critter had its over-the-board (OTB) debut at the ICT 2012, where it became a strong runner-up behind the Rybka cluster.[7]

Notable games[edit]

Tornado vs Critter,
nTCEC S2, Stage 2, 3.6
a b c d e f g h
d8 black queen
f8 black rook
g8 black king
a7 white queen
e7 black pawn
f7 black pawn
g7 black bishop
h7 black pawn
f6 black knight
g6 black pawn
f5 black bishop
d4 black rook
e3 white pawn
g3 white pawn
a2 white pawn
b2 white pawn
d2 white knight
f2 white pawn
g2 white bishop
h2 white pawn
a1 white rook
c1 white bishop
e1 white king
h1 white rook
7 7
6 6
5 5
4 4
3 3
2 2
1 1
a b c d e f g h
Here Critter played 16...Ng4, sacrificing a rook for a strong attack.


  1. ^ "CCRL 40/40 Rating List — All engines (best versions only)". Retrieved November 21, 2011. 
  2. ^ "IPON Rating List". Retrieved November 21, 2011. 
  3. ^ "SWCR chess engine ratings list". Retrieved November 21, 2011. 
  4. ^ "CEGT Best Versions". Retrieved November 21, 2011. 
  5. ^ "Critter Sourceforge Page". Retrieved 25 October 2013. 
  6. ^ "Critter official website". Retrieved November 21, 2011. 
  7. ^ "ICT12". Retrieved 25 October 2013. 
  8. ^ a b "Interesting Games from Season 2". Archived from the original on 25 October 2013. Retrieved 25 October 2013.