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Home * Engines * Fencer

Stevenson's wire fence [1]

a private chess engine by Shaun Press [2], and successor of Vanilla Chess. Fencer uses bitboards to generate moves and evaluate mobility and has a pretty fast evaluation but a slower move generator. The king safety function encourages it to launch attacks which work well against humans but not that much against other programs. Shaun mentioned valuing pieces as {1,4,4,6,12} instead of {1,3,3,5,9}, without any noticeable problems, and it appears Hydra had also headed in that direction, valuing minor pieces closer to 4 pawns than 3 [3]. Fencer played the NC3 2004, NC3 2005 and NC3 2006 Australasian National Computer Chess Championships, where it run on a P4 under Linux.

Selected Games

NC3 2006, round 5, Awesome - Fencer

[Event "NC3 2006"]
[Site "RedHill, Canberra, Australia"]
[Date "2006.08.20"]
[Round "5"]
[White "Awesome"]
[Black "Fencer"]
[Result "0-1"]

1.d4 e6 2.e4 Nf6 3.e5 Nd5 4.c4 Nb4 5.a3 N4c6 6.Be2 Qh4 7.Nf3 Qg4 8.d5 exd5 
9.cxd5 Ne7 10.Ng5 Qf5 11.f4 d6 12.Bd3 Qg4 13.e6 Qxd1+ 14.Kxd1 fxe6 15.f5 exd5 
16.Ne6 Bxe6 17.fxe6 Nbc6 18.Bb5 a6 19.Bxc6+ Nxc6 20.Nc3 d4 21.Nd5 O-O-O 22.Nf4 
Re8 23.g3 g5 24.Nh5 h6 25.Re1 Nd8 26.Re4 c5 27.Kd2 Rxe6 28.Rxe6 Nxe6 29.Ke2 d5
30.Nf6 d3+ 31.Kxd3 Bg7 32.Nxd5 Rd8 33.Ke4 Nd4 34.Rb1 b5 35.Be3 Re8+ 36.Kd3 c4+ 
37.Kd2 Rd8 38.Ne7+ Kb7 39.Kc1 Nb3+ 40.Kc2 b4 41.Nf5 bxa3 42.bxa3 Rd3 43.Bxg5 
Rc3+ 44.Kd1 hxg5 45.Nxg7 Ka7 46.Nf5 Rf3 47.g4 Rf2 48.Ne3 Rd2+ 49.Ke1 Rxh2 
50.Rd1 c3 51.Rd3 Ra2 52.Rxc3 Rxa3 53.Nc2 Ra2 54.Kd1 Rb2 55.Rh3 Rb1+ 56.Ke2 Nc5 
57.Rh5 Rb2 58.Kd1 Ne4 59.Kc1 Rb5 60.Rh7+ Rb7 61.Rh5 Rf7 62.Ne3 Rf3 63.Nf5 a5 
64.Rh7+ Kb6 65.Rh6+ Kc5 66.Re6 Kd5 67.Ra6 Rc3+ 68.Kd1 Rc5 69.Ne3+ Kd4 70.Nf5+ 
Kd3 71.Rh6 Nf2+ 72.Ke1 Nxg4 73.Rh3+ Kc4 74.Nd6+ Kb4 75.Rg3 Nf6 76.Rf3 Re5+ 
77.Kf1 Nh5 78.Rf2 Rd5 79.Rb2+ Kc3 80.Rb6 Kd4 81.Nb5+ Ke3 82.Nc3 Rd3 83.Rc6 Nf4 
84.Kg1 g4 85.Kh2 Kf3 86.Kh1 g3 87.Rb6 Rxc3 88.Rb1 Rc2 89.Rf1+ Rf2 90.Re1 Rh2+ 
91.Kg1 Nh3+ 92.Kf1 g2# 0-1

See also

Forum Posts

Re: 2005 National Computer Chess Championships by Shaun Press, Chess Chat, July 17, 2005 » Point Value

External Links

Fence (mathematics) from Wikipedia
Memory barrier from Wikipedia » Memory


  1. Cartoon in response to Mr Stevenson's (M.L.A.) suggestion for the erection of a rabbit fence between New South Wales and Queensland to check the invasion of rabbits, copied and digitized from an image appearing in The Queensland Figaro, August 2, 1884, p. 129, Rabbit-proof fence from Wikipedia
  2. Private Engine List from Ron Murawski's Computer-Chess Wiki
  3. Re: 2005 National Computer Chess Championships by Shaun Press, Chess Chat, July 17, 2005

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