with_opening_book.cpp

Demonstrates loading an 8-ply opening book at construction time and letting the solver short-circuit early-game positions that are already resolved in the book.

Demonstrates loading an 8-ply opening book at construction time and letting the solver short-circuit early-game positions that are already resolved in the book. If the book file is missing the example still works; it just performs the full search.

#include <filesystem>
#include <iostream>
 
#include "BitBully.h"
 
int main() {
  // Path is relative to wherever the binary is launched from.
  const std::filesystem::path bookPath = "openingbook_8ply.bin";
 
  BitBully::BitBully solver{bookPath};
  if (!solver.isBookLoaded()) {
    std::cerr << "(book not found, falling back to full search)\n";
  }
 
  BitBully::Board b;  // empty starting position
  const int score = solver.mtdf(b, /*firstGuess=*/0);
  std::cout << "score from start = " << score << '\n';
  return 0;
}