diff --git a/CMakeLists.txt b/CMakeLists.txt
index c95354d..ee671d2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,11 @@ endif()
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra")
 
-get_filename_component(KLOTSKI_ROOT "${CMAKE_CURRENT_SOURCE_DIR}" ABSOLUTE)
+get_filename_component(KLOTSKI_ROOT ${CMAKE_CURRENT_SOURCE_DIR} ABSOLUTE)
+
+set(KLOTSKI_UNIT_TEST ON)
+
+include(third_party/third_party.cmake)
 
 ################################################################################
 
@@ -28,9 +32,6 @@ if (BUILD_DYN)
     add_compile_options(-fPIC)
 endif()
 
-set(ABSL_PROPAGATE_CXX_STD ON)
-include_directories(third_party/abseil-cpp)
-add_subdirectory(third_party/abseil-cpp)
 
 add_subdirectory(src)
 
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index c0fb277..6a92dfe 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.0)
 
 set(CMAKE_CXX_STANDARD 20)
 
-project(klotski-core VERSION 0.1.2 LANGUAGES CXX)
+project(klotski-core VERSION 0.9.1 LANGUAGES CXX)
 
 add_compile_options(-fno-exceptions)
 
diff --git a/src/core_test/CMakeLists.txt b/src/core_test/CMakeLists.txt
index 166b835..f86645a 100644
--- a/src/core_test/CMakeLists.txt
+++ b/src/core_test/CMakeLists.txt
@@ -2,14 +2,6 @@ cmake_minimum_required(VERSION 3.0)
 
 set(CMAKE_CXX_STANDARD 20)
 
-###############################################################################################
-
-include_directories(${KLOTSKI_ROOT}/third_party/md5sum)
-add_subdirectory(${KLOTSKI_ROOT}/third_party/md5sum md5sum EXCLUDE_FROM_ALL)
-
-include_directories(${KLOTSKI_ROOT}/third_party/googletest/googletest/include)
-add_subdirectory(${KLOTSKI_ROOT}/third_party/googletest googletest EXCLUDE_FROM_ALL)
-
 set(KLOTSKI_TEST_DEPS klotski-core gtest gtest_main md5sum)
 
 ###############################################################################################
diff --git a/src/core_test/cases/all_cases.cc b/src/core_test/cases/all_cases.cc
index 61be112..d19ad04 100644
--- a/src/core_test/cases/all_cases.cc
+++ b/src/core_test/cases/all_cases.cc
@@ -5,6 +5,7 @@
 #include "md5sum.h"
 #include "all_cases.h"
 #include "gtest/gtest.h"
+#include "BS_thread_pool.hpp"
 
 using md5::md5sum;
 
@@ -92,3 +93,32 @@ TEST(Cases, all_cases_data) {
 }
 
 // TODO: test all_cases_parallel_build
+
+TEST(Cases, thread_pool_demo) {
+
+    BasicRanges::Instance().Build();
+
+    BS::thread_pool pool;
+
+    std::cout << pool.get_thread_count() << std::endl;
+
+    auto start = clock();
+    auto start_ = std::chrono::high_resolution_clock::now();
+
+    AllCases::Instance().BuildParallel([&pool](std::function<void()> &&func) {
+//        std::cout << "receive new task" << std::endl;
+        pool.push_task(func);
+    });
+
+//    std::cout << "parallel build complete" << std::endl;
+
+    pool.wait_for_tasks();
+
+    std::cerr << ((clock() - start) * 1000 / CLOCKS_PER_SEC) << "ms" << std::endl;
+    auto end = std::chrono::high_resolution_clock::now();
+    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - start_);
+    std::cerr << elapsed.count() / 1000 / 1000 << "ms" << std::endl;
+
+//    std::cout << "pool tasks complete" << std::endl;
+
+}
diff --git a/third_party/third_party.cmake b/third_party/third_party.cmake
new file mode 100644
index 0000000..5ef8923
--- /dev/null
+++ b/third_party/third_party.cmake
@@ -0,0 +1,19 @@
+set(KLOTSKI_THIRD_PARTY ${KLOTSKI_ROOT}/third_party)
+
+set(ABSL_PROPAGATE_CXX_STD ON)
+include_directories(abseil-cpp)
+add_subdirectory(${KLOTSKI_THIRD_PARTY}/abseil-cpp EXCLUDE_FROM_ALL)
+
+if (KLOTSKI_UNIT_TEST)
+    include_directories(${KLOTSKI_THIRD_PARTY}/md5sum)
+    add_subdirectory(${KLOTSKI_THIRD_PARTY}/md5sum EXCLUDE_FROM_ALL)
+endif (KLOTSKI_UNIT_TEST)
+
+if (KLOTSKI_UNIT_TEST)
+    include_directories(${KLOTSKI_THIRD_PARTY}/googletest/googletest/include)
+    add_subdirectory(${KLOTSKI_THIRD_PARTY}/googletest EXCLUDE_FROM_ALL)
+endif (KLOTSKI_UNIT_TEST)
+
+if (KLOTSKI_UNIT_TEST)
+    include_directories(${KLOTSKI_THIRD_PARTY}/thread-pool/include)
+endif (KLOTSKI_UNIT_TEST)