refactor(book): refactoring opening book code

1 files changed, 11 insertions, 0 deletions

diff --git a/src/bot.cpp b/src/bot.cpp
index 7b937bd..99f60aa 100644
--- a/src/bot.cpp
+++ b/src/bot.cpp
@@ -12,6 +12,7 @@
 #include <vector>
 
 #include "board/board.hpp"
+#include "book.hpp"
 #include "bot.hpp"
 #include "evaluate.hpp"
 #include "moves.hpp"
@@ -19,6 +20,7 @@
 
 constexpr int DEFAULT_TIME = 7;
 constexpr int Q_DEPTH_LIMIT = 4;
+constexpr int BOOK_DEPTH = 100;
 
 constexpr int MATE = 10000;
 
@@ -320,6 +322,15 @@ uint16_t GetBestMove(Game *b, int maxDepth, move_options options) {
   searchStopped = false;
   Nodes = 0;
 
+  uint64_t hash = GenerateZobristKey(b);
+
+  if (b->MoveClock <= BOOK_DEPTH) {
+    std::optional<uint16_t> bookMove = ProbeBook(hash);
+    if (bookMove.has_value()) {
+      return bookMove.value();
+    }
+  }
+
   // use depth INF if caller hasnt provided depth
   int actualDepth = maxDepth > 0 ? maxDepth : INF;