diff --git a/NineChess/src/config.h b/NineChess/src/config.h
index ae1e8eb7..d6e43154 100644
--- a/NineChess/src/config.h
+++ b/NineChess/src/config.h
@@ -31,6 +31,8 @@
 
 #define HASH_MAP_ENABLE
 
+#define RAPID_CHESS
+
 //#define BOOK_LEARNING
 
 #define THREEFOLD_REPETITION
diff --git a/NineChess/src/ninechessai_ab.cpp b/NineChess/src/ninechessai_ab.cpp
index d6d46870..1005d622 100644
--- a/NineChess/src/ninechessai_ab.cpp
+++ b/NineChess/src/ninechessai_ab.cpp
@@ -559,9 +559,13 @@ int NineChessAi_ab::changeDepth(int originalDepth)
 #endif // HASH_MAP_ENABLE
 #else // DEAL_WITH_HORIZON_EFFECT
 #ifdef HASH_MAP_ENABLE
-        int depthTable[] = { 6, 15, 16, 17, 16, 16, 16, 15, 12, 10, 9, 7, 1 };
+#ifdef RAPID_CHESS
+        int depthTable[] = { 6, 14, 15, 16, 15, 15, 15, 13, 10,  9, 8, 7, 1 };
 #else
-        int depthTable[] = { 2, 13, 13, 13, 12, 11, 10, 9, 9, 8, 8, 7, 1 };
+        int depthTable[] = { 6, 15, 16, 17, 16, 16, 16, 15, 12, 10, 9, 7, 1 };
+#endif  // RAPID_CHESS
+#else // HASH_MAP_ENABLE
+        int depthTable[] = { 2, 13, 13, 13, 12, 11, 10,  9,  9,  8, 8, 7, 1 };
 #endif
 #endif // DEAL_WITH_HORIZON_EFFECT
         newDepth = depthTable[chessTemp.getPiecesInHandCount_1()];