fix: propagate t-table results after search

1 files changed, 10 insertions, 4 deletions

diff --git a/src/grossmeister/UCI.rs b/src/grossmeister/UCI.rs
index 2c09a7b..3531a1e 100644
--- a/src/grossmeister/UCI.rs
+++ b/src/grossmeister/UCI.rs
@@ -10,7 +10,7 @@ const AUTHOR: &str = "Eugene Sokolov";
 impl Grossmeister {
     pub fn start(&mut self) {
         let mut board = Board::new();
-        let mut handle = None;
+        let mut search_handle = None;
 
         loop {
             let mut cmd = String::new();
@@ -47,11 +47,14 @@ impl Grossmeister {
                 "go" => {
                     match tokens[1] {
                         "infinite" => {
+                            // Clone current self and move it
+                            // into thread to analyze a position
                             let mut gm = self.clone();
                             let builder = Builder::new();
 
-                            handle = Some(builder.spawn(move || {
+                            search_handle = Some(builder.spawn(move || {
                                 gm.analyze(board);
+                                gm
                             }).unwrap());
                         },
                         _ => todo!()
@@ -59,8 +62,11 @@ impl Grossmeister {
                 },
                 "stop" => {
                     self.should_halt.store(true, std::sync::atomic::Ordering::Relaxed);
-                    if let Some(hand) = handle.take() {
-                        hand.join().unwrap();
+                    if let Some(hand) = search_handle.take() {
+                        // Search returns new SELF that is more powerful
+                        // because he evaluated many new positions and
+                        // his transposition table is more saturated
+                        *self = hand.join().unwrap();
                     }
                     self.should_halt.store(false, std::sync::atomic::Ordering::Relaxed);
                 }