added a position to perft

cpp/src/model/perft/perft.cpp

@@ -99,6 +99,14 @@ static std::map<std::string, std::map<int, int>> pos2expected{
             // {5, 164075551}, // 1230428
         },
     },
+
+    // -- Position 7
+    {
+        "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1",
+        {
+            {4, 4085603}, //
+        },
+    },
 };
 
 static std::stringstream res;