diff --git a/include/solver/cuda_cfr.h b/include/solver/cuda_cfr.h
index 42a01b7..6b3b010 100644
--- a/include/solver/cuda_cfr.h
+++ b/include/solver/cuda_cfr.h
@@ -78,6 +78,8 @@ class CudaCFR : public SliceCFR {
     virtual void clear_root_cfv();
     virtual void post_process();
     virtual vector<vector<float>> get_avg_strategy(int idx);
+    virtual vector<vector<float>> get_ev(int idx);
+    virtual void cfv_to_ev();
 };
 
 #endif // _CUDA_CFR_H_
diff --git a/include/solver/slice_cfr.h b/include/solver/slice_cfr.h
index 3837729..231f09f 100644
--- a/include/solver/slice_cfr.h
+++ b/include/solver/slice_cfr.h
@@ -196,7 +196,7 @@ class SliceCFR : public Solver {
     virtual vector<vector<float>> get_avg_strategy(int idx);// [n_hand,n_act]
     virtual vector<vector<float>> get_ev(int idx);// [n_hand,n_act]
     bool print_exploitability(int iter, Timer &timer);
-    void cfv_to_ev();
+    virtual void cfv_to_ev();
     void cfv_to_ev(Node *node, int player);
     void get_prob_sum(vector<float> &prob_sum, float &sum, int player, float *reach_prob, size_t board);
     void output_data(ActionNode *node, vector<Card> &cards, vector<vector<vector<float>>> &out, bool ev);
diff --git a/src/solver/cuda_cfr.cu b/src/solver/cuda_cfr.cu
index 4c12942..dcd3a3b 100644
--- a/src/solver/cuda_cfr.cu
+++ b/src/solver/cuda_cfr.cu
@@ -343,4 +343,8 @@ vector<vector<float>> CudaCFR::get_avg_strategy(int idx) {
         }
     }
     return strategy;
-}
\ No newline at end of file
+}
+vector<vector<float>> CudaCFR::get_ev(int idx) {
+    return {};
+}
+void CudaCFR::cfv_to_ev() {}