Update best move in asp. window fail high (#52)

STC - https://chess.swehosting.se/test/2188/
ELO   | 11.44 +- 6.90 (95%)
SPRT  | 8.0+0.08s Threads=1 Hash=32MB
LLR   | 3.02 (-2.94, 2.94) [0.00, 5.00]
GAMES | N: 5288 W: 1525 L: 1351 D: 2412

Bench: 9833783

CHANGELOG.txt

@@ -358,3 +358,14 @@ Use more of the increment time
     GAMES | N: 22376 W: 5740 L: 5481 D: 11155
 
 ====================================================================================
+5.3 [July 2]
+
+Update best move in asp. window fail high
+
+    STC - https://chess.swehosting.se/test/2188/
+    ELO   | 11.44 +- 6.90 (95%)
+    SPRT  | 8.0+0.08s Threads=1 Hash=32MB
+    LLR   | 3.02 (-2.94, 2.94) [0.00, 5.00]
+    GAMES | N: 5288 W: 1525 L: 1351 D: 2412
+
+====================================================================================

engine/src/body/search.rs

@@ -534,7 +534,7 @@ impl Search {
 
         for d in 1..=depth {
             self.info.seldepth = 0;
-            score = self.aspiration_window(board, &mut pv, score, d as i32);
+            score = self.aspiration_window(board, &mut pv, score, d as i32, &mut best_move);
 
             // Max time is up
             if self.info.stop && d > 1 {
@@ -600,6 +600,7 @@ impl Search {
         pv: &mut PVTable,
         prev_eval: i32,
         mut depth: i32,
+        best_move: &mut Option<Move>,
     ) -> i32 {
         let mut score: i32;
         let init_depth = depth;
@@ -634,6 +635,8 @@ impl Search {
                 beta = (INFINITY).min(score + delta);
 
                 depth -= i32::from(score.abs() < MATE_IN);
+
+                *best_move = pv.best_move();
             }
             // Search succeeded
             else {
@@ -703,7 +706,7 @@ impl Search {
 
         for d in 1..=depth {
             self.info.seldepth = 0;
-            score = self.aspiration_window(board, &mut pv, score, d as i32);
+            score = self.aspiration_window(board, &mut pv, score, d as i32, &mut best_move);
 
             if self.info.stop && d > 1 {
                 break;

engine/src/uci/handler.rs

@@ -13,7 +13,7 @@ pub enum SearchType {
 }
 
 fn id() {
-    println!("id name Svart 5.2");
+    println!("id name Svart 5.3");
     println!("id author Crippa");
 }