diff --git a/sea_battle_backend/src/bot_client.rs b/sea_battle_backend/src/bot_client.rs
index c9e4411..bf62244 100644
--- a/sea_battle_backend/src/bot_client.rs
+++ b/sea_battle_backend/src/bot_client.rs
@@ -9,7 +9,7 @@ use crate::human_player_ws::{ClientMessage, ServerMessage};
 #[derive(Debug, Eq, PartialEq)]
 pub enum ClientEndResult {
     Finished,
-    InvalidLayout,
+    InvalidBoatsLayout,
 }
 
 pub async fn run_client(
@@ -117,7 +117,7 @@ pub async fn run_client(
             }
             ServerMessage::RejectedBoatsLayout { errors } => {
                 log::warn!("Rejected boat layout: {:?}", errors);
-                return Ok(ClientEndResult::InvalidLayout);
+                return Ok(ClientEndResult::InvalidBoatsLayout);
             }
         }
     }
diff --git a/sea_battle_backend/src/data/boats_layout.rs b/sea_battle_backend/src/data/boats_layout.rs
index d94030a..a2b20aa 100644
--- a/sea_battle_backend/src/data/boats_layout.rs
+++ b/sea_battle_backend/src/data/boats_layout.rs
@@ -216,7 +216,8 @@ impl BoatsLayout {
         true
     }
 
-    pub fn errors(&self, rules: &GameRules) -> Vec<&str> {
+    /// Check if this boats layout is valid or not
+    pub fn errors(&self, rules: &GameRules) -> Vec<&'static str> {
         let mut errors = vec![];
 
         // Check the number of boats
@@ -272,12 +273,6 @@ impl BoatsLayout {
     pub fn number_of_boats(&self) -> usize {
         self.0.len()
     }
-
-    /// Check for layout invalid configuration
-    pub fn layouts_errors(&self, _rules: &GameRules) -> Vec<&'static str> {
-        //TODO : implement
-        vec![]
-    }
 }
 
 #[cfg(test)]
diff --git a/sea_battle_backend/src/data/game_rules.rs b/sea_battle_backend/src/data/game_rules.rs
index 4edbac9..6f4a118 100644
--- a/sea_battle_backend/src/data/game_rules.rs
+++ b/sea_battle_backend/src/data/game_rules.rs
@@ -44,6 +44,21 @@ impl GameRules {
             .collect()
     }
 
+    /// Remove last boat
+    pub fn pop_boat(&mut self) -> usize {
+        let list = self.boats_list();
+        self.set_boats_list(&list[0..list.len() - 1]);
+        *list.last().unwrap()
+    }
+
+    /// Add a boat to the list of boats
+    pub fn add_boat(&mut self, len: usize) {
+        let mut list = self.boats_list();
+        list.push(len);
+        self.set_boats_list(&list[0..list.len() - 1]);
+    }
+
+    /// Check game rules errors
     pub fn get_errors(&self) -> Vec<&str> {
         let config = PlayConfiguration::default();
 
diff --git a/sea_battle_backend/src/game.rs b/sea_battle_backend/src/game.rs
index b4015ab..189dfaf 100644
--- a/sea_battle_backend/src/game.rs
+++ b/sea_battle_backend/src/game.rs
@@ -208,9 +208,9 @@ impl Handler<SetBoatsLayout> for Game {
 
         let player_index = self.player_id_by_uuid(msg.0);
 
-        let errors = msg.1.layouts_errors(&self.rules);
+        let errors = msg.1.errors(&self.rules);
         if !errors.is_empty() {
-            log::error!("Got invalid boats layou!");
+            log::error!("Got invalid boats layout!");
             self.players[player_index].rejected_boats_layout(errors);
             self.players[player_index].query_boats_layout(&self.rules);
             return;
diff --git a/sea_battle_backend/src/test/client.rs b/sea_battle_backend/src/test/client.rs
index 0489914..07273d0 100644
--- a/sea_battle_backend/src/test/client.rs
+++ b/sea_battle_backend/src/test/client.rs
@@ -95,3 +95,60 @@ async fn full_game_no_touching_boats() {
         })
         .await;
 }
+
+#[tokio::test]
+async fn invalid_boats_layout_number_of_boats() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            let mut rules = GameRules::random_players_rules();
+            rules.boats_can_touch = false;
+            task::spawn_local(start_server(Args::for_test(
+                TestPort::FullGameTouchingBoats,
+            )));
+            wait_for_port(TestPort::FullGameTouchingBoats.port()).await;
+
+            let mut rules_modified = rules.clone();
+            rules_modified.pop_boat();
+            let layout = BoatsLayout::gen_random_for_rules(&rules_modified).unwrap();
+
+            let res =
+                bot_client::run_client(&TestPort::FullGameTouchingBoats.as_url(), &rules, layout)
+                    .await
+                    .unwrap();
+
+            assert_eq!(res, ClientEndResult::InvalidBoatsLayout);
+        })
+        .await;
+}
+
+#[tokio::test]
+async fn invalid_boats_layout_len_of_a_boat() {
+    let _ = env_logger::builder().is_test(true).try_init();
+
+    let local_set = task::LocalSet::new();
+    local_set
+        .run_until(async move {
+            let mut rules = GameRules::random_players_rules();
+            rules.boats_can_touch = false;
+            task::spawn_local(start_server(Args::for_test(
+                TestPort::FullGameTouchingBoats,
+            )));
+            wait_for_port(TestPort::FullGameTouchingBoats.port()).await;
+
+            let mut rules_modified = rules.clone();
+            let previous = rules_modified.pop_boat();
+            rules_modified.add_boat(previous - 1);
+            let layout = BoatsLayout::gen_random_for_rules(&rules_modified).unwrap();
+
+            let res =
+                bot_client::run_client(&TestPort::FullGameTouchingBoats.as_url(), &rules, layout)
+                    .await
+                    .unwrap();
+
+            assert_eq!(res, ClientEndResult::InvalidBoatsLayout);
+        })
+        .await;
+}