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diff --git a/Sources/SwiftChessNeo/Variant.swift b/Sources/SwiftChessNeo/Variant.swift
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+//
+//  Variant.swift
+//  Sage
+//
+//  Copyright 2016-2017 Nikolai Vazquez
+//  Modified by SuperGeroy
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+//
+
+/// A chess variant that defines how a `Board` is populated or how a `Game` is played.
+public enum Variant {
+
+    /// Standard chess.
+    case standard
+
+    /// Upside down chess where the piece colors swap starting squares.
+    case upsideDown
+
+    /// Standard regardless of Swift version.
+    internal static let _standard = Variant.standard
+
+    /// UpsideDown regardless of Swift version.
+    internal static let _upsideDown = Variant.upsideDown
+
+    /// `self` is standard variant.
+    public var isStandard: Bool {
+        return self == ._standard
+    }
+
+    /// `self` is upside down variant.
+    public var isUpsideDown: Bool {
+        return self == ._upsideDown
+    }
+
+}