feat: gradually widen aspiration windows

1 files changed, 4 insertions, 4 deletions

diff --git a/src/board/engine.rs b/src/board/engine.rs
index ceee108..58c9eb5 100644
--- a/src/board/engine.rs
+++ b/src/board/engine.rs
@@ -223,6 +223,7 @@ impl Board {
                 return (alpha, principal_variation)
             }
         }
+
         (alpha, principal_variation)
     }
 
@@ -287,7 +288,7 @@ impl Board {
         let mut depth = 1;
         let mut alpha = -INFINITY;
         let mut beta = INFINITY;
-        let window_size = 0.5;
+        let window_size = 0.25;
 
         loop {
             let search_result = self.negamax_search(alpha, beta, depth, deadline);
@@ -299,18 +300,17 @@ impl Board {
                     None => panic!("Could not find a move in time"),
                 }
             }
-
             if search_result.1.len() > 0 {
                 depth += 1;
                 alpha = search_result.0 - window_size;
                 beta = search_result.0 + window_size;
             } else if search_result.0 <= alpha { // Alpha-cutoff
                 println!("Alpha cutoff {} <= {:?}", search_result.0, (alpha, beta));
-                alpha = search_result.0 - window_size;
+                alpha = search_result.0 - window_size * 4.0;
                 continue;
             } else if search_result.0 >= beta { // Beta-cutoff
                 println!("Beta cutoff {:?} <= {}", (alpha, beta), search_result.0);
-                beta = search_result.0 + window_size;
+                beta = search_result.0 + window_size * 4.0;
                 continue;
             } else {
                 panic!("Can this ever be possible? (probably not)");