diff --git a/bamboo/src/boardfield.rs b/bamboo/src/boardfield.rs
index 28550a4..011ab2d 100644
--- a/bamboo/src/boardfield.rs
+++ b/bamboo/src/boardfield.rs
@@ -92,7 +92,7 @@ impl BoardfieldOps for Boardfield {
         // bf2: 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
 
         assert!(boardloc <= 63, "boardloc out of range");
-        assert!(boardloc > 0, "boardloc out of range");
+        assert!(boardloc >= 0, "boardloc out of range");
 
         let field = self[(boardloc / 2) as usize];
         let shift = 4 * (boardloc % 2);
@@ -103,7 +103,7 @@ impl BoardfieldOps for Boardfield {
     #[allow(clippy::cast_sign_loss)]
     fn set_pos(&mut self, boardloc: isize, piece: u8) {
         assert!(boardloc <= 63, "boardloc out of range {boardloc}");
-        assert!(boardloc > 0, "boardloc out of range {boardloc}");
+        assert!(boardloc >= 0, "boardloc out of range {boardloc}");
 
         let field = self[(boardloc / 2) as usize];
         let shift = 4 * (boardloc % 2);