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Counter, (Счетчик)
an UCI compliant chess engine by Vadim Chizhov, written in C# to run under Windows .Net, available since early 2007, last recent version 1.2 published in early 2010 [1]. Counter 0.8 played a strong CCCCISC 2008 over the board.
Mechanical Counters [2]


According to the sdchess description, Counter is based on bitboards using Pradu Kannan's magic bitboard implementation to generate moves [3], while the Counter 1.2 readme claims a hybrid board representation consisting of a 10x12 board and bitboards for pawns [4]. Counter applies PVS alpha-beta with transposition table, null move-, delta-, futility- and extended futility pruning, SEE, LMR, check-, mate threat-, passed pawn- and capture extensions, and IID. The evaluation has improved over the time, specially the assessment of a safe king and passed pawns, since version 0.8, lazy evaluation was removed.

Selected Games

CCCCISC 2008, round 5, Counter - SmarThink [5]
[Event "CIS 2008"]
[Site "Moscow SDCHESS RGSU"]
[Date "2008.03.02"]
[Round "5"]
[White "Counter 0.8"]
[Black "SmarThink 1.1 r1119"]
[Result "1/2-1/2"]
1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Nc3 c5 5.cxd5 exd5 6.Bg5 Nc6 7.e3 c4 8.Bxf6 gxf6 
9.Rc1 Be6 10.Be2 Qa5 11.O-O O-O-O 12.Re1 Kb8 13.Qc2 f5 14.Qd2 Rg8 15.Bd1 Rc8 
16.Ba4 Nb4 17.Bc2 Bd6 18.g3 Nxc2 19.Rxc2 f6 20.Nh4 Rcd8 21.Ng2 Bb4 22.Nf4 Bf7 
23.a3 Be7 24.f3 h5 25.Kf2 h4 26.Rg1 hxg3+ 27.hxg3 Rg5 28.Rh1 Rg7 29.Rh3 Qc7 
30.Rc1 Rg5 31.Nb5 Qd7 32.Qa5 a6 33.Nc3 Bg8 34.Rh8 Rc8 35.Rch1 Bd8 36.Qa4 Qd6 
37.R1h5 Bc7 38.Qc2 Qc6 39.R5h6 Qd6 40.Nh5 Rxh5 41.Rxh5 Qxg3+ 42.Kf1 f4 43.Rh3 
Qg7 44.exf4 b5 45.f5 Qg5 46.R3h4 Bf7 47.R8h7 Bg8 48.Rg4 Qe3 49.Rh3 Re8 50.Rg7 
a5 51.Qf2 Qd3+ 52.Kg2 b4 53.axb4 axb4 54.Rh8 bxc3 55.Rgxg8 Rxg8+ 56.Rxg8+ Kb7 
57.bxc3 Qxc3 58.Rg6 Qc1 59.Qe2 Qf4 60.Rg4 Qxf5 61.Qb2+ Kc6 62.Qa2 Kb5 63.Qb2+ 
Kc6 64.Qa2 Kb5 65.Qb2+ Kc6 1/2-1/2

Forum Posts

2007 ...

2010 ...

External Links

Chess Engine



  1. ^ Counter 1.2 Updated by Swaminathan, CCC, February 12, 2010
  2. ^ Three mechanical counters by Arnold Reinhold, April 20, 2009, Counter from Wikipedia
  3. ^ Counter by Вадим Чижов (Vadim Chizhov), Russia! from sdchess.ru
  4. ^ Counter_12 - readme.txt
  5. ^ The The First championship of the CIS (Первый официальный чемпионат СНГ) from sdchess.ru

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