1 files changed, 7 insertions, 3 deletions
diff --git a/src/uci/response.c b/src/uci/response.c
index ff89f8d..81459d6 100644
--- a/src/uci/response.c
+++ b/src/uci/response.c
@@ -35,7 +35,10 @@ void handle_initial(uci_state_t *state, uci_cmd_t cmd) {
     print_setting(state->option_settings[i]);
   }
   // ---
+  // flush around the handshake so piped GUIs see responses immediately
+  fflush(stdout);
   printf("uciok\n");
+  fflush(stdout);
   state->current_state = UCI_STATE_IDLE;
 }
 
@@ -164,10 +167,11 @@ void handle_idle(uci_state_t *state, uci_cmd_t cmd) {
 
 void handle_sync(uci_state_t *state, uci_cmd_t cmd) {
   // TIMEOUT NOTICE: THE FOLLOWING BLOCK SHOULDN'T TAKE MORE THAN 5 SECONDS
- 
-
+  if (cmd.empty || strcmp(cmd.root, "isready") != 0) {
+    // commands sent while a sync is pending must still be handled.
+    return handle_idle(state, cmd);
+  }
 
-  // ---
   printf("readyok\n");
   state->current_state = UCI_STATE_IDLE;
 }