diff --git a/package.json b/package.json
index 70c4542..3b45895 100644
--- a/package.json
+++ b/package.json
@@ -45,7 +45,7 @@
 		"babel-plugin-styled-components": "^1.10.7",
 		"clean-webpack-plugin": "^0.1.19",
 		"clipboard-polyfill": "^2.8.6",
-		"deckstrings": "^2.2.1",
+		"deckstrings": "^3.1.1",
 		"file-loader": "^2.0.0",
 		"hearthstonejson-client": "^1.4.0",
 		"html-webpack-include-sibling-chunks-plugin": "0.1.0",
diff --git a/src/globals.d.ts b/src/globals.d.ts
index 8cab7c7..da02a23 100644
--- a/src/globals.d.ts
+++ b/src/globals.d.ts
@@ -14,8 +14,3 @@ declare module "*.otf" {
 }
 
 declare const APPLICATION_VERSION: string;
-
-declare module "deckstrings" {
-	export function decode(deckString: string): object;
-	export function encode(deck: object): string;
-}
diff --git a/src/twitch-hdt.d.ts b/src/twitch-hdt.d.ts
index 625b964..af2b4b1 100644
--- a/src/twitch-hdt.d.ts
+++ b/src/twitch-hdt.d.ts
@@ -140,10 +140,43 @@ export interface BoardStateHand {
 	size: number;
 }
 
-export type BoardStateDeckCard = [number, number, number];
+export type BoardStateDeckCard = [
+	/**
+	 * dbf id
+	 */
+	number,
+	/**
+	 * current count
+	 */
+	number,
+	/**
+	 * initial count
+	 */
+	number,
+];
+
+export type SideboardDeckCard = [
+	/**
+	 * owner dbf id
+	 */
+	number,
+	/**
+	 * dbf id
+	 */
+	number,
+	/**
+	 * current count
+	 */
+	number,
+	/**
+	 * initial count
+	 */
+	number,
+];
 
 export interface BoardStateDeck {
-	cards?: BoardStateDeckCard[]; // [dbfId, current, initial]
+	cards?: BoardStateDeckCard[];
+	sideboard?: SideboardDeckCard[];
 	name?: string;
 	hero?: number;
 	format?: FormatType;
@@ -157,6 +190,7 @@ export const enum FormatType {
 	FT_WILD = 1,
 	FT_STANDARD = 2,
 	FT_CLASSIC = 3,
+	FT_TWIST = 4,
 }
 
 export const enum BnetGameType {
diff --git a/src/utils/hearthstone.ts b/src/utils/hearthstone.ts
index ef70c06..3ed9c39 100644
--- a/src/utils/hearthstone.ts
+++ b/src/utils/hearthstone.ts
@@ -1,8 +1,13 @@
-import { encode } from "deckstrings";
-import { BoardStateDeckCard, FormatType } from "../twitch-hdt";
+import { DeckDefinition, encode } from "deckstrings";
+import {
+	BoardStateDeckCard,
+	FormatType,
+	SideboardDeckCard,
+} from "../twitch-hdt";
 
 export const getDeckToCopy = (
 	cardList: BoardStateDeckCard[],
+	sideboard: SideboardDeckCard[],
 	format: FormatType,
 	heroes: number[],
 	name?: string,
@@ -11,10 +16,9 @@ export const getDeckToCopy = (
 		return null;
 	}
 
-	const initialCards: [number, number][] = cardList
+	const initialCards: DeckDefinition["cards"] = cardList
 		.filter((card: BoardStateDeckCard) => {
-			const [dbfId, current, initial] = card;
-			return !!initial;
+			return !!card[2];
 		})
 		.map<[number, number]>((card: BoardStateDeckCard) => {
 			const [dbfId, current, initial] = card;
@@ -34,15 +38,40 @@ export const getDeckToCopy = (
 			},
 			[],
 		);
-	const deckDescription = {
+
+	const sideboardCards: DeckDefinition["sideboardCards"] = sideboard
+		.filter((card: SideboardDeckCard) => {
+			return !!card[3];
+		})
+		.map<[number, number, number]>((card: SideboardDeckCard) => {
+			const [owner, dbfId, current, initial] = card;
+			return [dbfId, initial, owner];
+		})
+		.reduce<[number, number, number][]>(
+			(result: [number, number, number][], card: [number, number, number]) => {
+				result = result.slice(0);
+				for (let i = 0; i < result.length; i++) {
+					if (result[i][0] === card[0] && result[i][2] === card[2]) {
+						result[i][1] += card[1];
+						return result;
+					}
+				}
+				// new card, append
+				return result.concat([card]);
+			},
+			[],
+		);
+
+	const deckDefinition: DeckDefinition = {
 		cards: initialCards,
+		sideboardCards,
 		format,
 		heroes,
 	};
 
 	let deckstring = null;
 	try {
-		deckstring = encode(deckDescription);
+		deckstring = encode(deckDefinition);
 	} catch (e) {
 		console.error(e);
 		return null;
@@ -54,13 +83,20 @@ export const getDeckToCopy = (
 
 	const isStandard = format === FormatType.FT_STANDARD;
 	const isClassic = format === FormatType.FT_CLASSIC;
+	const isTwist = format === FormatType.FT_TWIST;
 
 	return [
 		...(name ? [`### ${name}`] : []),
 		...(format
 			? [
 					`# Format: ${
-						isStandard ? "Standard" : isClassic ? "Classic" : "Wild"
+						isStandard
+							? "Standard"
+							: isTwist
+							? "Twist"
+							: isClassic
+							? "Classic"
+							: "Wild"
 					}`,
 			  ]
 			: []),
diff --git a/src/viewer/CopyDeckButton.tsx b/src/viewer/CopyDeckButton.tsx
index 86b830d..ff1e691 100644
--- a/src/viewer/CopyDeckButton.tsx
+++ b/src/viewer/CopyDeckButton.tsx
@@ -92,11 +92,11 @@ const CopyDeckButton: React.FC<Props> = ({
 		if (!deck) {
 			return null;
 		}
-		const { name, cards, format, hero } = deck;
+		const { name, cards, sideboard, format, hero } = deck;
 		if (!format || !cards || !hero) {
 			return null;
 		}
-		return getDeckToCopy(cards, format, [hero], name);
+		return getDeckToCopy(cards, sideboard || [], format, [hero], name);
 	}, [deck]);
 
 	const copy = useCallback(async () => {
diff --git a/yarn.lock b/yarn.lock
index baea64c..7b263b6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2513,10 +2513,10 @@ decamelize@^1.2.0:
   resolved "https://registry.yarnpkg.com/decamelize/-/decamelize-1.2.0.tgz#f6534d15148269b20352e7bee26f501f9a191290"
   integrity sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=
 
-deckstrings@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/deckstrings/-/deckstrings-2.2.1.tgz#691fb8d8e19e77219cfd71ce56e38e1cd54d97a9"
-  integrity sha512-dwbSCKhmoPjT54Bs99PJB5Ur2F3vSwYKhkbiKXI2KoOmsc5orYSRfGAK10Qd9WAeUeFdPQ4PoUBrvtMuT7dveQ==
+deckstrings@^3.1.1:
+  version "3.1.1"
+  resolved "https://registry.yarnpkg.com/deckstrings/-/deckstrings-3.1.1.tgz#7cc60d97c9ddbd4bb22f3f1b608589cba119724b"
+  integrity sha512-FYrls5s83vE+y/fPVU5DjXUPh0aM77+fh52Rz/LWxZvS/fskWJ2z2JeyBTTV2y+CSq95MM/JexZeGCDYELtu6g==
 
 decode-uri-component@^0.2.0:
   version "0.2.0"