diff --git a/chain.go b/chain.go
index 3a51d79..08779a7 100644
--- a/chain.go
+++ b/chain.go
@@ -56,49 +56,31 @@ const (
 	ObjectActor
 )
 
-// TODO @fyrchik: replace string with int-like type.
-type ConditionType string
+type ConditionType byte
 
 // TODO @fyrchik: reduce the number of conditions.
 // Everything from here should be expressable, but we do not need them all.
 // https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_elements_condition_operators.html
 const (
 	// String condition operators.
-	CondStringEquals              ConditionType = "StringEquals"
-	CondStringNotEquals           ConditionType = "StringNotEquals"
-	CondStringEqualsIgnoreCase    ConditionType = "StringEqualsIgnoreCase"
-	CondStringNotEqualsIgnoreCase ConditionType = "StringNotEqualsIgnoreCase"
-	CondStringLike                ConditionType = "StringLike"
-	CondStringNotLike             ConditionType = "StringNotLike"
+	CondStringEquals ConditionType = iota
+	CondStringNotEquals
+	CondStringEqualsIgnoreCase
+	CondStringNotEqualsIgnoreCase
+	CondStringLike
+	CondStringNotLike
+	CondStringLessThan
+	CondStringLessThanEquals
+	CondStringGreaterThan
+	CondStringGreaterThanEquals
 
 	// Numeric condition operators.
-	CondNumericEquals            ConditionType = "NumericEquals"
-	CondNumericNotEquals         ConditionType = "NumericNotEquals"
-	CondNumericLessThan          ConditionType = "NumericLessThan"
-	CondNumericLessThanEquals    ConditionType = "NumericLessThanEquals"
-	CondNumericGreaterThan       ConditionType = "NumericGreaterThan"
-	CondNumericGreaterThanEquals ConditionType = "NumericGreaterThanEquals"
-
-	// Date condition operators.
-	CondDateEquals            ConditionType = "DateEquals"
-	CondDateNotEquals         ConditionType = "DateNotEquals"
-	CondDateLessThan          ConditionType = "DateLessThan"
-	CondDateLessThanEquals    ConditionType = "DateLessThanEquals"
-	CondDateGreaterThan       ConditionType = "DateGreaterThan"
-	CondDateGreaterThanEquals ConditionType = "DateGreaterThanEquals"
-
-	// Bolean condition operators.
-	CondBool ConditionType = "Bool"
-
-	// IP address condition operators.
-	CondIPAddress    ConditionType = "IpAddress"
-	CondNotIPAddress ConditionType = "NotIpAddress"
-
-	// ARN condition operators.
-	CondArnEquals    ConditionType = "ArnEquals"
-	CondArnLike      ConditionType = "ArnLike"
-	CondArnNotEquals ConditionType = "ArnNotEquals"
-	CondArnNotLike   ConditionType = "ArnNotLike"
+	CondNumericEquals
+	CondNumericNotEquals
+	CondNumericLessThan
+	CondNumericLessThanEquals
+	CondNumericGreaterThan
+	CondNumericGreaterThanEquals
 )
 
 func (c *Condition) Match(req Request) bool {
@@ -127,6 +109,14 @@ func (c *Condition) Match(req Request) bool {
 		return globMatch(val, c.Value)
 	case CondStringNotLike:
 		return !globMatch(val, c.Value)
+	case CondStringLessThan:
+		return val < c.Value
+	case CondStringLessThanEquals:
+		return val <= c.Value
+	case CondStringGreaterThan:
+		return val > c.Value
+	case CondStringGreaterThanEquals:
+		return val >= c.Value
 	}
 }