This function recursively generates moves for the current position and all children up to a certain depth, and by counting all the leaf nodes, it can be compared to a table of values to test its accuracy. Although this could be tested by playing many games, a better approach is to write a Perft function. It is important to ensure that the move generator works properly. hash move first, then captures, then killer moves, then all the rest in a chunk) on the premise that if one of the early moves causes a cutoff, then we may save on the effort of generating the rest of the moves. Some programs do not generate all moves at once, but do it in several stages (i.e. for tactical and quiet moves), which is convenient for book-keeping and assigning scores based on MVV-LVA, SEE, history, piece square table etc., to later perform a selection sort before actually making the move. With move ordering in mind, chess programs, while traversing pieces and their move-target sets once, store and buffer generated moves inside one or two move lists (i.e. When in double check, only king moves are permitted. Similar tricks can be used for generating possible moves out of check, which must be by the king, capturing the opponent's checking piece, or blocking its attack if it is a ray piece. And rooks can only generate at most 2 checking moves.to the squares with the rook's column and the king's row or the king's column and the rooks row. They can use the fact that a knight or bishop must start off on the same color square as the opponent king if they are to attack it. Special generators for the quiescence search might want to generate checks in addition to captures and promotions. For example, if the king is in check, the only possible legal moves are to capture the attacking piece, block the attacker if it is a "ray" piece, or move the king to safety. These special cases can be made more efficient than generating and testing each possible move to fit specific criteria. Most programs use special move generators for the quiescence search, sometimes supplemented by one for getting out of check. Pins are the main difficulty, particularly when en passant is involved. In Legal move generation, as the name implies, only legal moves are generated, which means extra time must be spent to make sure the king isn't going to be left or placed in check after each move. It is left up to the move-making function to test the move, or it is even possible to let the king remain in check and only test for the capture of the king on the next move. Info string NNUE evaluation using nn-3475407dc199.In Pseudo-legal move generation pieces obey their normal rules of movement, but they're not checked beforehand to see if they'll leave the king in check. Stockfish 14 by the Stockfish developers (see AUTHORS file) (That's also the output of the code below) Now, using io.WriteString it finishes after milliseconds without any (visible) calculation: Info depth 4 seldepth 4 multipv 1 score cp -161 nodes 1 tbhits 0 time 12 pv e7e6 f1d3 g8f6 b1c3 Info depth 3 seldepth 3 multipv 1 score cp -161 nodes tbhits 0 time 10 pv e7e6 f1d3 g8f6 Info depth 2 seldepth 2 multipv 1 score cp -161 nodes tbhits 0 time 8 pv e7e6 f1d3 Info depth 1 seldepth 1 multipv 1 score cp -161 nodes tbhits 0 time 7 pv e7e6 Info string NNUE evaluation using nn-3475407dc199.nnue enabled Using my command line tool it searches for about 5 seconds using a depth of 20, and it looks like this: In order to let the engine search for the best move, you use "go depth n" - the higher the depth - the longer it takes to search. The executable is called "Stockfish" (Chess Engine) and obviously usable via command line tools. I'm using the io package to work with an executable defined in my PATH. Or, process all the moves/board appending to data, then open your CSV file and write data writer.writerows(data): This will open the file "for creating" which overwrites any previous data.Īlso, from looking at your code and what you're trying to do, I see there are two ways to accomplish what you want, and you're trying both at the same time and that's creating other issues.Įither open the CSV file for writing, and loop over your moves writing as you process the board/moves with writer.writerow(stockfish(board, 10))/100): As pointed out by Camaendir in the comment, you're opening your output file on every iteration of the move.
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