![]() While 64 was quite common, todays programs tend to use higher values, e.g. It is used to statically allocate arrays like a Triangular PV-Table, or search stacks inside the programs data- or bss segment. The Maximum Search Depth of a depth-first search is usually determined by a compile time constant in ply units (MAX_PLAY). Score = -abSearch( -beta, -alpha, depth - DEPTH_OF_ONE_PLY, ply + 1 ) Īlpha = score // alpha acts like max in MiniMax Some programs determine the highest distance to the root at any node, others only at the horizon. Some programs also report a selective search depth beside the nominal search depth, most often much greater than the nominal search depth. Programs like The King ( Chessmaster), Junior and Rybka are known for interpreting depth differently for whatever reasons. In tournament conditions middlegame Junior typically gets 14-16 depths, and it looks competitive tactically.ĭue to different implementations, the reported search depth of chess programs is not comparable in general. a null-mover with "standard" extensions is interesting, but I don't know the answer. The question of what this is equivalent to in terms of other programs, e.g. If I am doing a good job, then you should have a hard time finding one. If you set Junior to depth 12, e.g., then you should be able to find a 7-ply combination where it fails. All the rest are extensions (in conventional terminology, I don't think of them this way). The brute-force ply depth is indeed half the publicized depth. Inside an iterative deepening framework, the search depth is incremented, usually by one ply, N - or by a fraction of one ply, for instance 1/2 ply.Īmir Ban on Junior in rgcc, March 1998 : Fractional plies with integers, where one corresponds to 1/N, require a depth resolution of N. Some programs extend or reduce in fractions of one ply. While the ply-index is incremented by one each time, the draft may be independently altered by various extension- or reduction-schemes and may also consider fractional extensions. However, there are various reasons to decouple the depth to horizon from the ply-index or depth from root, which are often passed as independent parameters to a recursive search routine (see code below). This index measures the ply-distance from the current node to the root and would therefor be sufficient to determine the remaining depth to the horizon, also called draft: This index is initialized with zero at the root, and is then incremented after making a move each time the recursive search is called. Most likely inside the search routine, a ply-index is used to index stacks or arrays with pre-saved search information. 3 Depth Comparison of different programs.Still no ChessBase Account? learn more > The ultimate chess experience every day, Pla圜 welcomes 20,000 chess players from all around the world – from beginner to grandmaster.Memorize it easily move by move by playing against the variation trainer. ![]() Still no ChessBase Account? learn more > Learn openings the right way! Build and maintain your repertoire.Still no ChessBase Account? learn more > Real Fun against a Chess Program! Play, analyze and train online against Fritz.Top authors like Daniel King, Lawrence Trent and Rustam Kasimdzhanov Still no ChessBase Account? learn more > Thousands of hours of high class video training.Still no ChessBase Account? learn more > Sac, sac, mate! Solve tactical positions of your playing strength. ![]() Store your games, training material and opening repertoire in the cloud.
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