test: add weird bishop sacrifice test-case

1 files changed, 14 insertions, 1 deletions

diff --git a/src/board/engine.rs b/src/board/engine.rs
index 5f64c39..3977258 100644
--- a/src/board/engine.rs
+++ b/src/board/engine.rs
@@ -197,7 +197,7 @@ impl Board {
 
         let king_tropism_penalty = self.king_tropism(color) - self.king_tropism(opponent_color);
 
-        material_advantage + 0.1 * mobility_advantage - 0.5 * pawn_structure_penalty + king_tropism_penalty * opponent_material / 150.0
+        material_advantage + 0.1 * mobility_advantage - 0.4 * pawn_structure_penalty + king_tropism_penalty * opponent_material / 150.0
     }
 
     /// Evaluate move for move ordering, prioritizing efficient captures
@@ -508,6 +508,19 @@ mod tests {
         );
     }
 
+    #[test]
+    fn weird_bishop_sac() {
+        let fen = String::from("r1b1k1nr/p4pp1/1pp1p3/4n2p/1b1qP3/1B1P3N/PPPBQPPP/RN2K2R w KQkq - 7 10");
+        let mut board = Board::from_FEN(fen);
+
+        let (_, pv) = board.iterative_deepening(5, Duration::from_secs(60));
+        assert_eq!(
+            pv[0],
+            Move { source: Square::C2, target: Square::C3, kind: MoveKind::Quiet },
+            "You should fork this bastard!"
+        );
+    }
+
     mod evaluation {
         use crate::{moves::{Move, MoveKind}, square::Square};