diff --git a/bg.lua b/bg.lua
index a72abb1..5064e98 100644
--- a/bg.lua
+++ b/bg.lua
@@ -1,5 +1,5 @@
 function draw_animated_bg(startx)
-  if (amplitude <= 0) return
+  if amplitude <= 0 then return end
   startx = startx or 0
   fillp(0b0101101001011010)
 
diff --git a/board.lua b/board.lua
index 5197889..5b4a92e 100644
--- a/board.lua
+++ b/board.lua
@@ -124,19 +124,22 @@ function Board.new()
         -- check count
         if filled and count(row, BLUE) ~= count(row, YELLOW) then
           add(issues, { "row", "count", row, y })
-          if (debug) printh("uneven count on row " .. y) if (not details) return issues
+          if debug then printh("uneven count on row " .. y) end
+          if not details then return issues end
         end
         -- check identical lines
         for k, other in ipairs(rows) do
           if filled and equal(other, row) and other ~= row then
             add(issues, { "row", "identical", row, y, k })
-            if (debug) printh("equal rows " .. k) if (not details) return issues
+            if debug then printh("equal rows " .. k) end
+            if not details then return issues end
           end
         end
         -- check triples
         if self:count_consecutives(row) > 2 then
           add(issues, { "row", "triples", row, y })
-          if (debug) printh("triples") if (not details) return issues
+          if debug then printh("triples") end
+          if not details then return issues end
         end
       end
 
@@ -147,19 +150,22 @@ function Board.new()
         -- check count
         if filled and count(col, BLUE) ~= count(col, YELLOW) then
           add(issues, { "col", "count", col, x })
-          if (debug) printh("uneven count") if (not details) return issues
+          if debug then printh("uneven count") end
+          if not details then return issues end
         end
         -- check identical lines
         for k, other in ipairs(cols) do
           if filled and equal(other, col) and other ~= col then
             add(issues, { "col", "identical", col, x, k })
-            if (debug) printh("equal cols") if (not details) return issues
+            if debug then printh("equal cols") end
+            if not details then return issues end
           end
         end
         -- check triples
         if self:count_consecutives(col) > 2 then
           add(issues, { "col", "triples", col, x })
-          if (debug) printh("triples") if (not details) return issues
+          if debug then printh("triples") end
+          if not details then return issues end
         end
       end
       return issues
@@ -230,7 +236,8 @@ function Board.new()
         -- Set a random color
         local z = self:get_random_zero()
         self:fill(z, rnd({ BLUE, YELLOW }))
-        if (debug) printh("!!!!!!!!!!!!!!!!! RANDOM FILL AT " .. z) return "invalid"
+        if debug then printh("!!!!!!!!!!!!!!!!! RANDOM FILL AT " .. z) end
+        return "invalid"
       end
       return (changed or self:is_complete()) and "valid" or "invalid"
     end,
@@ -263,7 +270,8 @@ function Board.new()
           -- do the surrounding
           for item in all(neighbors) do
             if item[1] then
-              if (debug) printh("Surrounding at " .. item[1]) self:fill(item[1], tiles[item[2]], true)
+              if debug then printh("Surrounding at " .. item[1]) end
+              self:fill(item[1], tiles[item[2]], true)
             end
           end
         end
@@ -279,7 +287,8 @@ function Board.new()
             local prev = tiles[idx - 1]
             local next = tiles[idx + 1]
             if prev ~= 0 and prev == next then
-              if (debug) printh("Splitting at " .. idx) self:fill(idx, prev, true)
+              if debug then printh("Splitting at " .. idx) end
+              self:fill(idx, prev, true)
             end
           end
 
@@ -288,7 +297,8 @@ function Board.new()
             local prev = tiles[idx - width]
             local next = tiles[idx + width]
             if prev ~= 0 and prev == next then
-              if (debug) printh("Splitting at " .. idx) self:fill(idx, prev, true)
+              if debug then printh("Splitting at " .. idx) end
+              self:fill(idx, prev, true)
             end
           end
         end
@@ -321,7 +331,7 @@ function Board.new()
     end,
 
     fill_row = function(self, y, color)
-      if (debug) printh("Filling line " .. y .. " in " .. (color == BLUE and "blue" or "yellow"))
+      if debug then printh("Filling line " .. y .. " in " .. (color == BLUE and "blue" or "yellow")) end
       local idx = self:xy_idx(1, y)
       for i = idx, idx + width - 1 do
         if self:get_tile(i) == 0 then
@@ -331,7 +341,7 @@ function Board.new()
     end,
 
     fill_col = function(self, x, color)
-      if (debug) printh("Filling column " .. x .. " in " .. (color == BLUE and "blue" or "yellow"))
+      if debug then printh("Filling column " .. x .. " in " .. (color == BLUE and "blue" or "yellow")) end
       local idx = self:xy_idx(x, 1)
       for i = idx, #tiles, width do
         if self:get_tile(i) == 0 then