fix shift

src/repr/bitboard.rs

@@ -3,6 +3,7 @@ use super::{
     coords::{CoordPair, CoordPairInner},
     CoordAxis,
 };
+use num::PrimInt;
 use static_assertions::const_assert;
 
 #[cfg(not(feature = "bitvec"))]
@@ -45,7 +46,7 @@ impl BitBoard {
 
     // Directional shifts with edge masking (prevents wrapping)
     pub const fn east(&self) -> Self {
-        let mask = !Self::col_mask(Board::BOARD_SIZE).0; // Mask to block column 7 bits
+        let mask = !Self::col_mask(Board::BOARD_SIZE - 1).0; // Mask to block column 7 bits
         Self((self.0 & mask) << 1)
     }
 
@@ -100,7 +101,7 @@ impl BitBoard {
     }
 
     pub fn intersects(self, other: Self) -> bool {
-        (self & other).count() > 0
+        (self.0 & other.0) > 0
     }
 
     pub fn union(self, other: Self) -> Self {