diff --git a/examples/wchess/libwchess/Chessboard.cpp b/examples/wchess/libwchess/Chessboard.cpp
index 0bd24113..a47ed120 100644
--- a/examples/wchess/libwchess/Chessboard.cpp
+++ b/examples/wchess/libwchess/Chessboard.cpp
@@ -108,14 +108,15 @@ Chessboard::Chessboard()
     std::sort(blackMoves.begin(), blackMoves.end());
 }
 
-std::string Chessboard::getRules() const {
+std::string Chessboard::getRules(const std::string& prompt) const {
     // leading space is very important!
     std::string result =
     "\n"
     "# leading space is very important!\n"
     "\n"
-    "move ::= \" \" ((piece | frompos) \" \" \"to \"?)? topos\n"
-    "\n";
+    "move ::= prompt \" \" ((piece | frompos) \" \" \"to \"?)? topos\n"
+    "\n"
+    "prompt ::= \" " + prompt + "\"\n";
 
     std::set<std::string> pieces;
     std::set<std::string> from_pos;
diff --git a/examples/wchess/libwchess/Chessboard.h b/examples/wchess/libwchess/Chessboard.h
index 7808a704..0d4e847a 100644
--- a/examples/wchess/libwchess/Chessboard.h
+++ b/examples/wchess/libwchess/Chessboard.h
@@ -8,7 +8,7 @@ public:
     Chessboard();
     std::string process(const std::string& t);
     std::string stringifyBoard();
-    std::string getRules() const;
+    std::string getRules(const std::string & prompt) const;
     using Move = std::pair<int, int>;
 private:
     bool move(const Move& move);
diff --git a/examples/wchess/libwchess/WChess.cpp b/examples/wchess/libwchess/WChess.cpp
index f85c21db..e41e32a7 100644
--- a/examples/wchess/libwchess/WChess.cpp
+++ b/examples/wchess/libwchess/WChess.cpp
@@ -45,8 +45,8 @@ std::string WChess::stringify_board() const {
 void WChess::run() {
     set_status("loading data ...");
 
-    bool have_prompt  = true;
-    bool ask_prompt   = false;
+    bool have_prompt  = false;
+    bool ask_prompt   = true;
 
     float logprob_min0 = 0.0f;
     float logprob_min  = 0.0f;
@@ -60,13 +60,26 @@ void WChess::run() {
     std::vector<float> pcmf32_cur;
     std::vector<float> pcmf32_prompt;
 
-    std::string prompt = "";
-    float prompt_prop = 0.0f;
+    const std::string k_prompt = "King bishop rook queen knight";
 
     while (check_running()) {
         // delay
         std::this_thread::sleep_for(std::chrono::milliseconds(100));
 
+        if (ask_prompt) {
+            fprintf(stdout, "\n");
+            fprintf(stdout, "%s: Say the following phrase: '%s%s%s'\n", __func__, "\033[1m", k_prompt.c_str(), "\033[0m");
+            fprintf(stdout, "\n");
+
+            {
+                char txt[1024];
+                snprintf(txt, sizeof(txt), "Say the following phrase: '%s'", k_prompt.c_str());
+                set_status(txt);
+            }
+
+            ask_prompt = false;
+        }
+
         int64_t t_ms = 0;
 
         {
@@ -76,12 +89,37 @@ void WChess::run() {
                 fprintf(stdout, "%s: Processing ...\n", __func__);
                 set_status("Processing ...");
 
-                {
+                if (!have_prompt) {
+                    const auto txt = ::trim(transcribe(pcmf32_cur, logprob_min, logprob_sum, n_tokens, t_ms));
+
+                    fprintf(stdout, "%s: Heard '%s%s%s', (t = %d ms)\n", __func__, "\033[1m", txt.c_str(), "\033[0m", (int) t_ms);
+
+                    const float sim = similarity(txt, k_prompt);
+
+                    if (txt.length() < 0.8*k_prompt.length() || txt.length() > 1.2*k_prompt.length() || sim < 0.8f) {
+                        fprintf(stdout, "%s: WARNING: prompt not recognized, try again\n", __func__);
+                        ask_prompt = true;
+                    } else {
+                        fprintf(stdout, "\n");
+                        fprintf(stdout, "%s: The prompt has been recognized!\n", __func__);
+                        fprintf(stdout, "%s: Waiting for voice commands ...\n", __func__);
+                        fprintf(stdout, "\n");
+
+                        {
+                            char txt[1024];
+                            snprintf(txt, sizeof(txt), "Success! Waiting for voice commands ...");
+                            set_status(txt);
+                        }
+
+                        // save the audio for the prompt
+                        pcmf32_prompt = pcmf32_cur;
+                        have_prompt = true;
+                    }
+                } else {
+                    pcmf32_cur.insert(pcmf32_cur.begin(), WHISPER_SAMPLE_RATE, 0.0f);
                     if (!pcmf32_prompt.empty()) pcmf32_cur.insert(pcmf32_cur.begin(), pcmf32_prompt.begin(), pcmf32_prompt.end());
 
-                    if (WHISPER_SAMPLE_RATE > pcmf32_cur.size()) pcmf32_cur.insert(pcmf32_cur.begin(), WHISPER_SAMPLE_RATE - pcmf32_cur.size(), 0.0f);
-
-                    std::string rules = m_board->getRules();
+                    std::string rules = m_board->getRules(k_prompt);
                     fprintf(stdout, "%s: grammar rules:\n'%s'\n", __func__, rules.c_str());
 
                     auto grammar_parsed = grammar_parser::parse(rules.c_str());
@@ -100,18 +138,16 @@ void WChess::run() {
                     // find the prompt in the text
                     float best_sim = 0.0f;
                     size_t best_len = 0;
-                    if (!prompt.empty()) {
-                        auto pos = txt.find_first_of('.');
+                    for (int n = 0.8*k_prompt.size(); n <= 1.2*k_prompt.size(); ++n) {
+                        const auto prompt = txt.substr(0, n);
 
-                        const auto header = txt.substr(0, pos);
-
-                        const float sim = similarity(prompt, header);
+                        const float sim = similarity(prompt, k_prompt);
 
                         //fprintf(stderr, "%s: prompt = '%s', sim = %f\n", __func__, prompt.c_str(), sim);
 
                         if (sim > best_sim) {
                             best_sim = sim;
-                            best_len = pos + 1;
+                            best_len = n;
                         }
                     }