fix: do not stop until the move is found

This fixes the following test-case:
`echo 'position startpos\ngo\nstop' | cargo run --release`

1 files changed, 2 insertions, 2 deletions

diff --git a/src/grossmeister/search.rs b/src/grossmeister/search.rs
index 45d2330..4d990f6 100644
--- a/src/grossmeister/search.rs
+++ b/src/grossmeister/search.rs
@@ -146,7 +146,7 @@ impl Grossmeister {
             }
 
             // Could not finish in time, return what we have so far
-            if self.should_halt.load(std::sync::atomic::Ordering::SeqCst) {
+            if root_distance > 0 && self.should_halt.load(std::sync::atomic::Ordering::SeqCst) {
                 break;
             }
         }
@@ -287,7 +287,7 @@ impl Grossmeister {
         while depth <= max_depth {
             let score = self.negamax_search(-INFINITY, INFINITY, depth, 0);
 
-            if self.should_halt.load(std::sync::atomic::Ordering::SeqCst) {
+            if depth > 1 && self.should_halt.load(std::sync::atomic::Ordering::SeqCst) {
                 println!("info string halting search");
                 break;
             }