![]() This is one core piece of any chess engine. A very fast piece of code to expand any position into all possible answers. Asking the possible move count question for depth 7 - will take 2100ms. Where if building an engine aggressive pruning methods need to happen to see good and appropriate moves 20 plys deep. (I will count a move as a node)Ĭhess is an exponential expanding tree with a branching factor of ~25. That is 119 Million in 85ms or just about 1400 Million nodes per second. How many moves are in this position after 3 moves by each player?Ī movegenerator can answer these questions very fast. The cost is there but it is hidden most of the time. Compilers and Cpus do a good job of hiding branch latency - yet by replacing an if else chain by branchless bitwise arithmetic - an order of magnitude, faster code can be achieved. Every State that exists in only a handful of positions out of Billions should not even need an if statement. It can be captured in a special way by another pawn. inserting domain knowledge into the codeįor example, after pushing a pawn from the first Rank - an Enpassant Pawn is created.replacing branches by branchless programming.moving as much work as possible into compiletime.Writing fast code in any programming language means: Template metaprogramming and constexpr evaluation in C++ give us these tools. ![]() The fastest possible piece of code you can ever write is non existing code.
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