diff --git a/piece.go b/piece.go
index 2c53a81..60848d9 100644
--- a/piece.go
+++ b/piece.go
@@ -1,13 +1,19 @@
 package main
 
-import "strconv"
-
 //Rank represents the rank of a piece
+//go:generate enumer -type=Rank
 type Rank int
 
-func (r Rank) String() string {
-	return strconv.Itoa(int(r))
-}
+//Rank rank pieces
+const (
+	Flag Rank = iota
+	Spy
+	Scout
+	Miner
+	Captain
+	General
+	Marshal
+)
 
 //Piece :game piece
 type Piece struct {
diff --git a/rank_enumer.go b/rank_enumer.go
new file mode 100644
index 0000000..4f46237
--- /dev/null
+++ b/rank_enumer.go
@@ -0,0 +1,55 @@
+// Code generated by "enumer -type=Rank"; DO NOT EDIT.
+
+//
+package main
+
+import (
+	"fmt"
+)
+
+const _RankName = "FlagSpyScoutMinerCaptainGeneralMarshal"
+
+var _RankIndex = [...]uint8{0, 4, 7, 12, 17, 24, 31, 38}
+
+func (i Rank) String() string {
+	if i < 0 || i >= Rank(len(_RankIndex)-1) {
+		return fmt.Sprintf("Rank(%d)", i)
+	}
+	return _RankName[_RankIndex[i]:_RankIndex[i+1]]
+}
+
+var _RankValues = []Rank{0, 1, 2, 3, 4, 5, 6}
+
+var _RankNameToValueMap = map[string]Rank{
+	_RankName[0:4]:   0,
+	_RankName[4:7]:   1,
+	_RankName[7:12]:  2,
+	_RankName[12:17]: 3,
+	_RankName[17:24]: 4,
+	_RankName[24:31]: 5,
+	_RankName[31:38]: 6,
+}
+
+// RankString retrieves an enum value from the enum constants string name.
+// Throws an error if the param is not part of the enum.
+func RankString(s string) (Rank, error) {
+	if val, ok := _RankNameToValueMap[s]; ok {
+		return val, nil
+	}
+	return 0, fmt.Errorf("%s does not belong to Rank values", s)
+}
+
+// RankValues returns all values of the enum
+func RankValues() []Rank {
+	return _RankValues
+}
+
+// IsARank returns "true" if the value is listed in the enum definition. "false" otherwise
+func (i Rank) IsARank() bool {
+	for _, v := range _RankValues {
+		if i == v {
+			return true
+		}
+	}
+	return false
+}