diff --git a/Cargo.toml b/Cargo.toml
index b9dad30..3bd79ad 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ byte-strings = "0.2.2"
 #alloc_counter = "0.0.4"
 
 [profile.release]
-debug = 1
+debug = 0
 lto = "fat"
 codegen-units = 1
 panic = "abort"
diff --git a/src/azul.rs b/src/azul.rs
index 4647b03..b3d76dc 100644
--- a/src/azul.rs
+++ b/src/azul.rs
@@ -665,6 +665,79 @@ impl State {
         self.player = (self.player + 1) % self.boards.len() as u8;
         Ok(())
     }
+    pub fn is_legal(&self, game_move: GameMove) -> Result<(), &'static str> {
+        let board =  &self.boards[self.player as usize];
+        match game_move {
+            GameMove(_, Tile::Start, _) => return Err("You can't take the start tile specifically"),
+            GameMove(0, _, 0) => {
+                if !&self.market.contains(&game_move.1) {
+                    return Err("Market does not contain selected tile")
+                }
+                else {
+                    Ok(())
+                }
+            },
+            GameMove(0, _, 1..=5) => {
+                if self.market.len() == 0 {
+                    return Err("Market is empty");
+                }
+                else if self.market.contains(&game_move.1) {
+                    let target = &board.patterns[game_move.2 - 1];
+                    if target.first().is_some() && target[0] != game_move.1 {
+                        return Err("That pattern line already contains a different color")
+                    }
+                    let empty = game_move.2 - target.len();
+
+                    if empty == 0 {
+                        return Err("That pattern is full")
+                    }
+
+                    Ok(())
+                }
+                else {
+                    return Err("Market does not contain selected tile")
+                }
+            },
+            GameMove(1..=9, _, _) => {
+                let board =  &self.boards[self.player as usize];
+                if game_move.0 > self.factories.len() {
+                    return Err("That factory is out of bounds");
+                }
+
+                let factory = self.factories[game_move.0 - 1].deref();
+                if factory.contains(&game_move.1) {  
+                    let mut hand = factory.clone();
+                    hand.retain(|x| *x == game_move.1);
+
+                    match game_move.2 {
+                        0 => Ok(()),
+                        1..=9 => {
+                            let target = &board.patterns[game_move.2 - 1];
+                            if target.first().is_some() && target[0] != game_move.1 {
+                                return Err("That pattern line already contains a different color")
+                            }
+                            let empty = game_move.2 - target.len();
+                            if hand.len() <= empty {
+                                return Ok(())
+                            }
+                            else if empty != 0 {
+                                return Ok(())
+                            }
+                            else {
+                                return Err("That pattern line is full")
+                            }
+                        },
+                        _ => return Err("Not a valid destination")
+                    }
+                }
+                else {
+                    return Err("That tile is not in that factory")
+                }
+            },
+            GameMove(_,_,_) => return Err("Not a valid move")
+        }
+
+    }
     /*pub fn hash(&self) -> [u8; 256]{
         [
             [self.player],
diff --git a/src/azul2.rs b/src/azul2.rs
index 6e3e8c8..eda19cd 100644
--- a/src/azul2.rs
+++ b/src/azul2.rs
@@ -485,9 +485,10 @@ impl Game2 {
 use std::time::{Instant, Duration};
 
 pub fn size_of_bitfields() -> Result<(), &'static str> {
-    //println!("size of bitfield game: {}", std::mem::size_of::<Game2>());
+    println!("size of bitfield game: {}", std::mem::size_of::<Game2>());
+    println!("size of state: {}", std::mem::size_of::<super::azul::State>());
 
-    let game2 = Game2::create();
+/*    let game2 = Game2::create();
     //println!("debug: {:#?}", game2);
     //println!("{:?}", game2.into_bytes());
 
@@ -510,7 +511,7 @@ pub fn size_of_bitfields() -> Result<(), &'static str> {
     let game_1_time = now.elapsed().as_nanos();
 
     println!("{} | {}", game_1_time, game_2_time);
-
+*/
     Ok(())
 
 
diff --git a/src/main.rs b/src/main.rs
index 247fb16..323dc5e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -100,11 +100,12 @@ fn count_options(_game: Game, depth: u8, treshold: u8) -> u128 {
 
     let mut multiplier = 1;
 
+    // Upper bound calculation by skipping first depth and assuming most complicated possible game as multiplier
     let game = match depth {
         0 => {
             let mut new_game = _game.clone();
             for i in GameMoveIter::new(2).next() {
-                match new_game.do_move( i) {
+                match new_game.do_move(i) {
                     Ok(_) => break,
                     Err(_) => continue
                 }
@@ -121,6 +122,9 @@ fn count_options(_game: Game, depth: u8, treshold: u8) -> u128 {
 
     for game_move in i {
         //println!("{:?}", game_move);
+        if game.is_legal(game_move).is_err() {
+            continue;
+        };
         let mut new_game = game.clone();
         let r = new_game.do_move(game_move);
         match r {