Fix book probe on Machine Black

Not sure why this was needed anymore.

diff --git a/backend.c b/backend.c
index e4b939c..9460ad0 100644 (file)
--- a/backend.c
+++ b/backend.c
@@ -15304,6 +15304,7 @@ MachineBlackEvent ()
     SetMachineThinkingEnables();
     first.maybeThinking = TRUE;
     StartClocks();
+    firstMove = FALSE;
 
     if (appData.autoFlipView && flipView) {
       flipView = !flipView;