Green Light Chess

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Home * Engines * Green Light Chess

Green Light Chess, (Green Light, GLChess [2])
a WinBoard compliant chess engine by Tim Foden, written in C++, version 2.09 relying on an own 32-bit Windows GUI [3].


Green Light started its life in early 1997 as 0x88 engine, and since version 2.xx evolved to bitboards with an 8x8 board. It applies Alpha-Beta inside an iterative deepening framework with fractional ply extensions, transposition table, null move reductions, razoring, and pruning in quiescence search based on SEE. In version 2.14, TD-λ learning was implemented which required milli-pawn values rather than centi-pawn values. The well maintained 2.18 change log gives a decent overview of features, modifications and bugfixes within the engine development, its GUI and WinBoard implementations [4].

Tournament Play

Green Light Chess felt well in the green-light flooded cave in Graz and played a strong WCCC 2003 with a respectable fifth place and 6 points out of 11, and further played the CCT6 with 5½ out of 9.

Selected Games

WCCC 2003, round 5, Green Light - Falcon [5]

[Event "WCCC 2003"]
[Site "Graz, Austria"]
[Date "2003.11.25"]
[Round "5"]
[White "Green Light"]
[Black "Falcon"]
[Result "1-0"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4 a6 5.Qe3 Nc6 6.Nc3 Nf6 7.Bd2 Ng4 8.Qe2 g6 
9.h3 Nge5 10.Nxe5 dxe5 11.O-O-O Nd4 12.Qc4 Be6 13.Qb4 Bd7 14.Be3 e6 15.Qc4 
Rc8 16.Qd3 Bc5 17.f4 f6 18.fxe5 fxe5 19.h4 O-O 20.h5 Be8 21.Bd2 Bb4 22.hxg6 
Bxg6 23.Qe3 Qa5 24.Kb1 Qb6 25.Rh6 Rc7 26.Qg3 Rg7 27.Qe3 Ba3 28.Na4 Qc6 
29.Nc3 Bc5 30.Qh3 b5 31.Bd3 b4 32.Ne2 Nxe2 33.Bxe2 Rf2 34.Bd3 a5 35.Be1 Rf8 
36.Bg3 Be3 37.Rh4 Bd4 38.Rg4 Qc5 39.Rg5 Re8 40.Rh1 Qc7 41.Qh2 Ra8 42.Bxe5 
Bxe5 43.Qxe5 Qxe5 44.Rxe5 Bf7 45.Rg1 Rg3 46.Be2 Kh8 47.Bf3 Rag8 48.Rc1 R3g5 
49.Rxg5 Rxg5 50.c3 bxc3 51.Rxc3 Kg7 52.Kc2 Kf6 53.Kd3 Bh5 54.Bxh5 Rxh5 
55.Kd4 Rg5 56.g3 Rb5 57.b3 Rg5 58.Re3 Rg8 59.e5+ Kf5 60.a3 Rd8+ 61.Kc5 Rd1 
62.Kb6 Rd5 63.b4 axb4 64.axb4 Rd1 65.b5 h5 66.Kb7 h4 67.gxh4 Rh1 68.b6 Rxh4 
69.Rb3 Kxe5 70.Kc6 Rc4+ 71.Kd7 Rh4 72.b7 Rh8 73.b8=Q+ Rxb8 1-0 

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