diff --git a/src/board.rs b/src/board.rs
index 1995db7..1d333b8 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -1,8 +1,5 @@
 use super::*;
-use alloc::{
-    string::{String, ToString},
-    vec::Vec,
-};
+
 use core::cmp::Ordering;
 
 pub struct BoardBuilder {
@@ -505,14 +502,14 @@ impl Board {
     /// Otherwise, return false.
     #[inline]
     pub fn has_piece(&self, pos: Position) -> bool {
-        self.get_piece(pos) != None
+        self.get_piece(pos).is_some()
     }
 
     /// If a square at a given position has no piece, return true.
     /// Otherwise, return false.
     #[inline]
     pub fn has_no_piece(&self, pos: Position) -> bool {
-        self.get_piece(pos) == None
+        self.get_piece(pos).is_none()
     }
 
     /// If there is a king on the board, return the position that it sits on.
@@ -734,7 +731,7 @@ impl Board {
 
         pieces.sort();
 
-        if pieces.len() == 0 {
+        if pieces.is_empty() {
             false
         } else if pieces.len() == 1 && pieces[0].is_king() {
             false
@@ -748,14 +745,11 @@ impl Board {
             && pieces[2].is_knight()
         {
             false
-        } else if pieces.len() == 3
-            && pieces[0].is_king()
-            && pieces[1].is_bishop()
-            && pieces[2].is_bishop()
-        {
-            false
         } else {
-            true
+            !(pieces.len() == 3
+                && pieces[0].is_king()
+                && pieces[1].is_bishop()
+                && pieces[2].is_bishop())
         }
     }
 
diff --git a/src/position.rs b/src/position.rs
index fc2d5f7..7b636e9 100644
--- a/src/position.rs
+++ b/src/position.rs
@@ -124,7 +124,7 @@ impl Position {
 
     /// Create a `Position` from its respective row or column number.
     /// The row and column numbers can be any of 0, 1, 2, 3, 4, 5, 6, or 7.
-    /// 
+    ///
     /// Examples:
     /// - `A1 = Position::new(0, 0)`
     /// - `A8 = Position::new(7, 0)`
@@ -217,7 +217,7 @@ impl Position {
     fn diagonal_distance(&self, other: Self) -> i32 {
         (self.col - other.col).abs()
     }
-    
+
     /// Is this position orthogonal to another position?
     #[inline]
     pub fn is_orthogonal_to(&self, other: Self) -> bool {
@@ -231,7 +231,7 @@ impl Position {
     }
 
     /// Is this position adjacent to another position?
-    /// 
+    ///
     /// Adjacent positions have either:
     /// 1. A diagonal distance of one from each other
     /// 2. An orthogonal distance of one from each other
@@ -248,7 +248,7 @@ impl Position {
 
     /// Is this position beneath another position on the board?
     /// Pieces "beneath" other pieces on the board have lower ranks.
-    /// 
+    ///
     /// So, for example, A7 is below A8.
     #[inline]
     pub fn is_below(&self, other: Self) -> bool {
@@ -257,7 +257,7 @@ impl Position {
 
     /// Is this position above another position on the board?
     /// Pieces "above" other pieces on the board have higher ranks.
-    /// 
+    ///
     /// So, for example, A8 is above A8.
     #[inline]
     pub fn is_above(&self, other: Self) -> bool {
@@ -267,7 +267,7 @@ impl Position {
     /// Is this position left of another position on the board?
     /// Pieces "left of" other pieces on the board have a lower
     /// lexigraphical column character.
-    /// 
+    ///
     /// So, for example, A8 is left of B8.
     #[inline]
     pub fn is_left_of(&self, other: Self) -> bool {
@@ -277,7 +277,7 @@ impl Position {
     /// Is this position right of another position on the board?
     /// Pieces "right of" other pieces on the board have a higher
     /// lexigraphical column character.
-    /// 
+    ///
     /// So, for example, B8 is right of A8.
     #[inline]
     pub fn is_right_of(&self, other: Self) -> bool {
@@ -285,7 +285,7 @@ impl Position {
     }
 
     /// Get the position directly below this position.
-    /// 
+    ///
     /// IMPORTANT NOTE: This will NOT check for positions
     /// off of the board! You could easily get an invalid
     /// position if you do not check with the `is_on_board`
@@ -296,7 +296,7 @@ impl Position {
     }
 
     /// Get the position directly above this position.
-    /// 
+    ///
     /// IMPORTANT NOTE: This will NOT check for positions
     /// off of the board! You could easily get an invalid
     /// position if you do not check with the `is_on_board`
@@ -308,7 +308,7 @@ impl Position {
 
     /// Get the next square upwards from a respective player's
     /// pawn.
-    /// 
+    ///
     /// IMPORTANT NOTE: This will NOT check for positions
     /// off of the board! You could easily get an invalid
     /// position if you do not check with the `is_on_board`
@@ -323,7 +323,7 @@ impl Position {
 
     /// Get the next square backwards from a respective player's
     /// pawn.
-    /// 
+    ///
     /// IMPORTANT NOTE: This will NOT check for positions
     /// off of the board! You could easily get an invalid
     /// position if you do not check with the `is_on_board`
@@ -332,9 +332,9 @@ impl Position {
     pub fn pawn_back(&self, ally_color: Color) -> Self {
         self.pawn_up(!ally_color)
     }
-    
+
     /// Get the position directly left of this position.
-    /// 
+    ///
     /// IMPORTANT NOTE: This will NOT check for positions
     /// off of the board! You could easily get an invalid
     /// position if you do not check with the `is_on_board`
@@ -345,7 +345,7 @@ impl Position {
     }
 
     /// Get the position directly right of this position.
-    /// 
+    ///
     /// IMPORTANT NOTE: This will NOT check for positions
     /// off of the board! You could easily get an invalid
     /// position if you do not check with the `is_on_board`
@@ -369,7 +369,7 @@ impl Position {
     pub fn is_kingside_rook(&self) -> bool {
         (self.row == 0 || self.row == 7) && self.col == 7
     }
-    
+
     /// Is this the starting position of the queenside rook?
     #[inline]
     pub fn is_queenside_rook(&self) -> bool {
@@ -378,7 +378,7 @@ impl Position {
 
     /// Get the list of positions from this position to another
     /// position, moving diagonally.
-    /// 
+    ///
     /// This does _not_ include the `from` position, and includes the `to` position.
     pub fn diagonals_to(&self, to: Self) -> Vec<Self> {
         if !self.is_diagonal_to(to) {
@@ -411,7 +411,7 @@ impl Position {
 
     /// Get the list of positions from this position to another
     /// position, moving orthogonally.
-    /// 
+    ///
     /// This does _not_ include the `from` position, and includes the `to` position.
     pub fn orthogonals_to(&self, to: Self) -> Vec<Self> {
         if !self.is_orthogonal_to(to) {
diff --git a/src/square.rs b/src/square.rs
index b0d106f..32003cd 100644
--- a/src/square.rs
+++ b/src/square.rs
@@ -19,7 +19,7 @@ impl Square {
     /// Does this square contain a piece?
     #[inline]
     pub fn is_empty(&self) -> bool {
-        self.piece == None
+        self.piece.is_none()
     }
 
     /// Get the piece contained in this square.
diff --git a/src/util.rs b/src/util.rs
index baa06ee..e859362 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -154,7 +154,7 @@ pub fn parse_fen(fen: &str) -> Result<Board, String> {
                     false => Color::Black,
                 };
                 // using as because row/col always in u8 range
-                let position = Position::new(row as i32, col as i32);
+                let position = Position::new(row, col);
                 let piece = match x.to_ascii_lowercase() {
                     'b' => Piece::Bishop(color, position),
                     'n' => Piece::Knight(color, position),