use an OR in a spot where it will help some tiny amount, set up doc

src/board/mod.rs

@@ -144,6 +144,7 @@ impl Display for BitBoard {
     }
 }
 
+#[inline]
 fn shift_in_direction(magnitude: i8, value: Board) -> Board {
     if magnitude >= 0 {
         let (result, _) = value.overflowing_shl(magnitude.unsigned_abs() as u32);
@@ -374,10 +375,8 @@ impl BitBoard {
             }
         }
 
-        self.boards[current_team_idx] += flips;
+        self.boards[current_team_idx] |= flips | play;
         self.boards[current_team.next() as usize] ^= flips;
-
-        self.boards[current_team_idx] += play;
     }
 
     /// Compute the score (B, W) by counting the excited bits in each board.

src/game.rs

@@ -50,7 +50,7 @@ impl Game {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::board::{squares::*, view::View};
+    use crate::board::squares::*;
     #[test]
     fn play_switches_team() {
         let mut game = Game::default();