default depth

1 files changed, 4 insertions, 1 deletions

diff --git a/src/bot.cpp b/src/bot.cpp
index 621f3ea..908b418 100644
--- a/src/bot.cpp
+++ b/src/bot.cpp
@@ -10,6 +10,8 @@
 #include <iostream>
 #include <vector>
 
+const int DEFAULT_DEPTH = 4;
+
 const int PAWN_VALUE = 100;
 const int KNIGHT_VALUE = 320;
 const int BISHOP_VALUE = 400;
@@ -126,6 +128,7 @@ std::vector<Move> GetSortedLegalMoves(Game *g) {
 }
 
 Move EngineGetBestMove(Game *b, int depth) {
+  int usedDepth = (depth != -1 ? depth : DEFAULT_DEPTH);
   auto moves = GetSortedLegalMoves(b);
   if (moves.size() == 0) {
     std::cout << "Expected a position with legal moves";
@@ -140,7 +143,7 @@ Move EngineGetBestMove(Game *b, int depth) {
     float alpha = -INFINITY;
     float beta = INFINITY;
 
-    float eval = minimax(depth - 1, b, alpha, beta);
+    float eval = minimax(usedDepth - 1, b, alpha, beta);
 
     UnMakeMove(undo, b);
     if (b->turn) {