diff --git a/index.ts b/index.ts
index 2fbf2642..fade3a4a 100644
--- a/index.ts
+++ b/index.ts
@@ -19,5 +19,6 @@ export default [
     'src/ComplicatedAnimations',
     'src/ComplicatedDemo',
     'src/InputDemo',
-    'src/StickDemo'
+    'src/StickDemo',
+    'src/Gobang',
 ]
\ No newline at end of file
diff --git a/src/Gobang.ts b/src/Gobang.ts
new file mode 100644
index 00000000..9f93fb47
--- /dev/null
+++ b/src/Gobang.ts
@@ -0,0 +1,184 @@
+import { Stack, Group, Color, stack, layoutConfig, LayoutSpec, vlayout, IVLayout, Text, ViewHolder, ViewModel, VMPanel, scroller } from "doric";
+import { title } from "./utils";
+
+
+const lineColor = Color.BLACK
+function columLine() {
+    return (new Stack).apply({
+        layoutConfig: layoutConfig().most().configWidth(LayoutSpec.JUST),
+        width: 1,
+        backgroundColor: lineColor,
+    })
+}
+
+function rowLine() {
+    return (new Stack).apply({
+        layoutConfig: layoutConfig().most().configHeight(LayoutSpec.JUST),
+        height: 1,
+        backgroundColor: lineColor,
+    })
+}
+
+function pointer(size: number) {
+    return (new Stack).apply({
+        layoutConfig: layoutConfig().just(),
+        width: size,
+        height: size,
+    })
+}
+
+const count = 13
+enum State {
+    Unspecified,
+    BLACK,
+    WHITE,
+}
+
+interface GoBangState {
+    count: number
+    gap: number
+    role: "white" | "black"
+    matrix: Map<number, State>
+}
+
+class GoBangVH extends ViewHolder {
+    pieces!: Stack
+    root!: Group
+    gap = 0
+    onPieceDown?: (x: number, y: number) => void
+    build(root: Group): void {
+        this.root = root
+    }
+    actualBuild(state: GoBangState): void {
+        const boardSize = state.gap * (state.count - 1)
+        const gap = state.gap
+        const borderWidth = gap
+        let hintText: Text
+        this.gap = state.gap
+        scroller(
+            vlayout([
+                title("GoBang"),
+                stack([
+                    stack([
+                        ...(new Array(count - 2)).fill(0).map((_, idx) => {
+                            return columLine().also(v => {
+                                v.left = (idx + 1) * gap
+                            })
+                        }
+                        ),
+                        ...(new Array(count - 2)).fill(0).map((_, idx) => {
+                            return rowLine().also(v => {
+                                v.top = (idx + 1) * gap
+                            })
+                        }
+                        ),
+                    ])
+                        .apply({
+                            layoutConfig: layoutConfig().just()
+                                .configMargin({ top: borderWidth, left: borderWidth }),
+                            width: boardSize,
+                            height: boardSize,
+                            border: {
+                                width: 1,
+                                color: lineColor,
+                            },
+                        }),
+
+                    ...(new Array(count * count)).fill(0).map((_, idx) => {
+                        const row = Math.floor(idx / count)
+                        const colum = idx % count
+                        return pointer(gap).also(v => {
+                            v.top = (row - 0.5) * gap + borderWidth
+                            v.left = (colum - 0.5) * gap + borderWidth
+                            v.onClick = () => {
+                                hintText.text = `row:${row},colum:${colum}`
+                                if (this.onPieceDown) {
+                                    this.onPieceDown(colum, row)
+                                }
+                            }
+                        })
+                    }),
+                    this.pieces = (new Stack).apply({
+                        layoutConfig: layoutConfig().most(),
+                    }),
+                ]).apply({
+                    layoutConfig: layoutConfig().just(),
+                    width: boardSize + 2 * borderWidth,
+                    height: boardSize + 2 * borderWidth,
+                    backgroundColor: Color.parse("#E6B080"),
+                }),
+                hintText = title('Hint'),
+            ])
+                .apply({
+                    layoutConfig: layoutConfig().fit(),
+                    backgroundColor: Color.parse('#ecf0f1'),
+                } as IVLayout)
+        ).in(this.root)
+    }
+
+    addPiece(pos: number, role: "black" | "white") {
+        const x = Math.floor(pos / count)
+        const y = pos % count
+        const piece = (new Stack).also(v => {
+            v.width = v.height = 30
+            v.corners = 15
+            v.backgroundColor = role === 'black' ? Color.BLACK : Color.WHITE
+        })
+        piece.centerX = (x + 1) * this.gap
+        piece.centerY = (y + 1) * this.gap
+        this.pieces.addChild(piece)
+    }
+}
+
+class GoBangVM extends ViewModel<GoBangState, GoBangVH>{
+    onAttached(state: GoBangState, vh: GoBangVH) {
+        vh.actualBuild(state)
+        vh.onPieceDown = (x, y) => {
+            this.updateState(it => {
+                if (it.role === 'black') {
+                    it.matrix.set(x * count + y, State.BLACK)
+                    it.role = 'white'
+                } else {
+                    it.matrix.set(x * count + y, State.WHITE)
+                    it.role = 'black'
+                }
+            })
+        }
+    }
+
+    onBind(state: GoBangState, vh: GoBangVH) {
+        vh.pieces.children.length = 0
+        for (let e of state.matrix.keys()) {
+            const v = state.matrix.get(e)
+            if (v === State.BLACK) {
+                vh.addPiece(e, 'black')
+            }
+            switch (v) {
+                case State.BLACK:
+                    vh.addPiece(e, 'black')
+                    break
+                case State.WHITE:
+                    vh.addPiece(e, 'white')
+                    break
+            }
+        }
+    }
+}
+
+@Entry
+class Gobang extends VMPanel<GoBangState, GoBangVH> {
+    getViewModelClass() {
+        return GoBangVM
+    }
+    getState(): GoBangState {
+        return {
+            count,
+            gap: 40,
+            role: "black",
+            matrix: new Map
+        }
+    }
+    getViewHolderClass() {
+        return GoBangVH
+    }
+}
\ No newline at end of file
diff --git a/src/LayoutDemo.ts b/src/LayoutDemo.ts
index 6a08b068..79027d39 100644
--- a/src/LayoutDemo.ts
+++ b/src/LayoutDemo.ts
@@ -1,6 +1,5 @@
 
 import { Group, Panel, Text, text, gravity, Color, Stack, LayoutSpec, list, NativeCall, listItem, log, vlayout, Gravity, hlayout, slider, slideItem, scroller, IVLayout, IHLayout, layoutConfig } from "doric";
-import { O_TRUNC } from "constants";
 
 const colors = [
     "#f0932b",