diff --git a/Mage.Server.Plugins/Mage.Player.AI.MA/src/mage/player/ai/ComputerPlayer6.java b/Mage.Server.Plugins/Mage.Player.AI.MA/src/mage/player/ai/ComputerPlayer6.java
index 1009b78d03d..4a3936a1e6c 100644
--- a/Mage.Server.Plugins/Mage.Player.AI.MA/src/mage/player/ai/ComputerPlayer6.java
+++ b/Mage.Server.Plugins/Mage.Player.AI.MA/src/mage/player/ai/ComputerPlayer6.java
@@ -841,10 +841,14 @@ public class ComputerPlayer6 extends ComputerPlayer /*implements Player*/ {
                     int attackerValue = eval.evaluate(attacker, game);
                     for (Permanent blocker : possibleBlockers) {
                         int blockerValue = eval.evaluate(blocker, game);
+
+                        // blocker can kill attacker
                         if (attacker.getPower().getValue() <= blocker.getToughness().getValue()
                                 && attacker.getToughness().getValue() <= blocker.getPower().getValue()) {
                             safeToAttack = false;
                         }
+
+                        // kill each other
                         if (attacker.getToughness().getValue() == blocker.getPower().getValue()
                                 && attacker.getPower().getValue() == blocker.getToughness().getValue()) {
                             if (attackerValue > blockerValue
@@ -859,19 +863,26 @@ public class ComputerPlayer6 extends ComputerPlayer /*implements Player*/ {
                                 safeToAttack = false;
                             }
                         }
+
+                        // attacker can kill by deathtouch
                         if (attacker.getAbilities().containsKey(DeathtouchAbility.getInstance().getId())
                                 || attacker.getAbilities().containsKey(IndestructibleAbility.getInstance().getId())) {
                             safeToAttack = true;
                         }
+
+                        // attacker can ignore blocker
                         if (attacker.getAbilities().containsKey(FlyingAbility.getInstance().getId())
                                 && !blocker.getAbilities().containsKey(FlyingAbility.getInstance().getId())
                                 && !blocker.getAbilities().containsKey(ReachAbility.getInstance().getId())) {
                             safeToAttack = true;
                         }
                     }
+
+                    // 0 damage
                     if (attacker.getPower().getValue() == 0) {
                         safeToAttack = false;
                     }
+
                     if (safeToAttack) {
                         // undo has to be possible e.g. if not able to pay a attack fee (e.g. Ghostly Prison)
                         attackingPlayer.declareAttacker(attacker.getId(), defenderId, game, true);
diff --git a/Mage.Tests/src/test/java/org/mage/test/AI/basic/AttackAndBlockByAITest.java b/Mage.Tests/src/test/java/org/mage/test/AI/basic/AttackAndBlockByAITest.java
index 720846e5a62..e8495eb60b3 100644
--- a/Mage.Tests/src/test/java/org/mage/test/AI/basic/AttackAndBlockByAITest.java
+++ b/Mage.Tests/src/test/java/org/mage/test/AI/basic/AttackAndBlockByAITest.java
@@ -204,4 +204,19 @@ public class AttackAndBlockByAITest extends CardTestPlayerBaseAI {
         assertLife(playerA, 20);
         assertLife(playerB, 20);
     }
+
+    @Test
+    public void test_Attack_1_with_counters_vs_1() {
+        // chainbreaker real stats is 1/1, it's can be saftly attacked
+        addCard(Zone.BATTLEFIELD, playerA, "Balduvian Bears", 1); // 2/2
+        addCard(Zone.BATTLEFIELD, playerB, "Chainbreaker", 1); // 3/3, but with 2x -1/-1 counters
+
+        setStopAt(1, PhaseStep.END_TURN);
+        setStrictChooseMode(true);
+        execute();
+        assertAllCommandsUsed();
+
+        assertLife(playerA, 20);
+        assertLife(playerB, 20 - 2);
+    }
 }