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node_modules
dist
.DS_Store
*.md
!README.md
.env

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# DeepSacrifice
## Overview
DeepSacrifice is a **design prototype** for a lightweight **reinforcement learning (RL)** loop in a chess environment. The goal is to train an agent to play **aggressive**, **sacrificial**, and **attacking** chess using feedback from **direct human-vs-agent gameplay** and **post-game evaluations** by a language model (LLM).
The idea is that, over time, the agent will adapt its skill level to the user's skill level (and surpass it) while playing exclusively aggressive chess (e.g., sacrificing material for the initiative, attacking the king, luring the opponent to overextend).
---
## Purpose
- **Human-in-the-loop RL**: The user serves as the environment, directly interacting with the agent. Each complete game generates a full **trajectory** (sequence of states and actions), which is scored and used for learning.
- **LLM-based reward model**: The LLM acts as a **reward function**, scoring trajectories for **aggression**, **brilliance**, and **sacrifice justification**. This replaces sparse binary rewards with dense, informative feedback.
- **Policy improvement**: The agent's **policy** (its move-selection strategy) is updated based on **rewards** received at the end of each game, enabling **reinforcement learning** over time.
- **Exploration vs. Exploitation**: The agent balances exploring risky sacrifices versus exploiting known aggressive lines that have yielded high rewards in the past.
---
## Core Concepts
| RL Term | Implementation in DeepSacrifice |
|----------------------|---------------------------------------------------------|
| **State** | The chess board (FEN) at each ply |
| **Action** | A legal move by the agent (SAN) |
| **Trajectory** | Full game history of states and agent actions |
| **Reward** | Post-game score from LLM: aggression, brilliance, win |
| **Policy** | Move selection logic (with aggression weighting) |
| **Learning** | Heuristic updates to parameters based on reward |
| **Environment** | The human player and game loop |
| **Episode** | A single completed chess game |
---
## Walkthrough
### 1) Start a new game
![Start Game](./images/ds-1.png)
### 2) Play against an aggressive chess agent
![Play Game](./images/ds-2.png)
### 3) Score the game with an LLM
![Score Game](./images/ds-3.png)
---
## Learning Flow
1. **Game is played**
The agent and user alternate actions in the chess environment. The episode ends when the game is complete.
2. **Trajectory is recorded**
Log the full sequence of states (FENs) and agent actions (SANs), including sacrificial decisions and the final outcome (win/draw/loss).
3. **LLM evaluates the trajectory**
After the episode, the trajectory is passed to an LLM, which provides dense feedback using a structured prompt:
> "Given the following chess game FEN history and SAN moves, evaluate each agent move for aggression/brilliance and sacrifice justification. Return a JSON array of scores and justifications."
4. **Reward is computed**
The LLM scores are aggregated into a **scalar reward** using a weighted formula, incorporating:
- Aggression
- Brilliance
- Game outcome
5. **Policy is updated**
Based on the final reward, the agent performs **policy improvement** by adjusting its internal parameters:
- Aggression threshold
- Sacrifice prioritization
- Move ordering or evaluation heuristics
6. **Next episode begins**
The updated policy is used in the next game against the user, completing the **reinforcement loop**.
---
## Data Flow
```mermaid
flowchart TD
User[User] -->|Makes move| Frontend
Frontend -->|POST /api/move| API
API -->|Get move| Agent
Agent -->|Move| API
API -->|Update| Frontend
Frontend -->|Show board| User
Frontend -->|Click 'Score Game'| API2[API /api/game/llm_feedback]
API2 -->|Send FENs/SANs| LLM
LLM -->|Scores/Justifies| API2
API2 -->|Scored moves| Frontend
Frontend -->|Show LLM feedback| User
API2 -->|LLM feedback| Agent
Agent -->|Update policy| Agent
```
---
## Setup & Install
### Prerequisites
- [Bun](https://bun.sh/) (package management, runtime)
- [OpenAI API key](https://platform.openai.com/account/api-keys)
### Environment Setup
1. Copy the example environment file:
```sh
cp .env.template .env
```
2. Open `.env` and input your OpenAI API key for `OPENAI_API_KEY`.
### Install dependencies
```sh
bun install
```
Now, open two terminals and run the following commands:
### Run the frontend
```sh
bun dev
```
### Run the backend
```sh
bun dev:server
```

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</html>

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import { Chess } from "chess.js";
export function getAggressiveMove(
fen: string,
): { from: string; to: string } | null {
const chess = new Chess(fen);
const moves = chess.moves({ verbose: true });
if (moves.length === 0) return null;
// Prefer captures
const captures = moves.filter(
(m) => m.flags.includes("c") || m.flags.includes("e"),
);
if (captures.length > 0) {
const move = captures[Math.floor(Math.random() * captures.length)];
return { from: move.from, to: move.to };
}
// Prefer checks
const checks = moves.filter((m) => {
chess.move({ from: m.from, to: m.to });
const isCheck = chess.inCheck();
chess.undo();
return isCheck;
});
if (checks.length > 0) {
const move = checks[Math.floor(Math.random() * checks.length)];
return { from: move.from, to: move.to };
}
// Otherwise, pick random
const move = moves[Math.floor(Math.random() * moves.length)];
return { from: move.from, to: move.to };
}
// Minimal AttackerAgent class with placeholder learning
export class AttackerAgent {
getMove(fen: string): { from: string; to: string } | null {
return getAggressiveMove(fen);
}
learnFromGame(gameData: any, llmFeedback: any): void {
// TODO: Implement incremental learning from LLM feedback
// For now, this is a placeholder
}
}

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import { Elysia } from "elysia";
import { getAggressiveMove } from "../agents/attacker_agent";
import { ChessEnv } from "../env/chess_env";
import { scoreAndJustifyGame } from "../llm/llm_feedback";
import { computeReward } from "../reward/reward_fn";
const env = new ChessEnv();
const games: any[] = [];
let currentGame: any[] = [];
const app = new Elysia()
.get("/ping", () => "pong")
.get("/api/games/latest", () => games.slice(-5))
.post("/api/move", async ({ body }) => {
const { from, to, san, color } = body as {
from: string;
to: string;
san?: string;
color?: string;
};
const currentFen = env.getFEN();
const currentColor = currentFen.split(" ")[1] === "b" ? "black" : "white";
if (color && color !== currentColor) {
return { error: `It's not ${color}'s turn.` };
}
// User move
const { fen: userFen, done: userDone } = env.step({ from, to });
const userMoveData = {
fen: userFen,
move: { from, to, san },
reward: null, // Placeholder, to be filled after scoring
llmFeedback: { score: null, justification: null },
};
currentGame.push(userMoveData);
// If game is over after user move, return
if (userDone) {
games.push([...currentGame]);
const moves = [...currentGame];
currentGame = [];
return {
moves,
done: true,
};
}
// Agent move (as black)
const agentMove = getAggressiveMove(userFen);
let agentMoveData = null;
let agentDone = false;
if (agentMove) {
const agentPrevFen = env.getFEN();
const { fen: agentFen, done: agentIsDone } = env.step(agentMove);
agentMoveData = {
fen: agentFen,
move: agentMove,
reward: null, // Placeholder
llmFeedback: { score: null, justification: null },
};
currentGame.push(agentMoveData);
agentDone = agentIsDone;
if (agentIsDone) {
games.push([...currentGame]);
const moves = [...currentGame];
currentGame = [];
return {
moves,
done: true,
};
}
}
return {
moves: [userMoveData, agentMoveData].filter(Boolean),
done: agentDone,
};
})
// .get("/evaluate", async () => {
// const fen = env.getFEN();
// const evalResult = await evaluatePosition(fen);
// return evalResult;
// })
.post("/api/train/start", () => ({ started: true }))
.get("/api/agent/status", () => ({ gamesPlayed: games.length, avgReward: 0 }))
.post("/api/reset", () => {
env.reset();
currentGame.length = 0;
return { fen: env.getFEN() };
})
.post("/api/game/llm_feedback", async ({ body }) => {
// Expects: { moves: [{ fen, move: { from, to, san } }] }
const { moves } = body as {
moves: {
fen: string;
move: { from: string; to: string; san?: string };
}[];
};
if (!Array.isArray(moves)) {
return { error: "Missing or invalid moves array" };
}
const fenHistory = moves.map((m) => m.fen);
const moveSANs = moves.map(
(m) => m.move.san || `${m.move.from}-${m.move.to}`,
);
// Only score agent moves (even indices)
const agentMoveIndices = moves
.map((_, idx) => idx)
.filter((idx) => idx % 2 === 1);
const agentFens = agentMoveIndices.map((idx) => fenHistory[idx]);
const agentSANs = agentMoveIndices.map((idx) => moveSANs[idx]);
let feedbackArr = [];
try {
feedbackArr = await scoreAndJustifyGame(agentFens, agentSANs);
} catch (e) {
return { error: "LLM feedback failed", details: String(e) };
}
const scoredMoves = await Promise.all(
moves.map(async (moveData, idx) => {
if (idx % 2 === 1) {
// Agent move: fill in feedback
const { fen, move } = moveData;
const moveSAN = String(move.san ?? `${move.from}-${move.to}`);
const feedback = feedbackArr.shift() || {
score: null,
justification: null,
};
const reward = await computeReward(
fen,
moveSAN,
feedback.score ?? "",
feedback.justification ?? "",
);
return {
...moveData,
reward,
llmFeedback: feedback,
};
} else {
// User move: leave feedback/reward as null
return {
...moveData,
reward: null,
llmFeedback: { score: null, justification: null },
};
}
}),
);
return { moves: scoredMoves };
})
.listen(3001);
console.log("API running on http://localhost:3001");

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/**
* Placeholder for LLM-based move aggression/brilliance scoring.
* Will use OpenAI GPT-4o-mini via callOpenAI in the future.
*/
import { callOpenAI } from "./openai_client";
export async function scoreMoveAggression(
fenHistory: string[],
moveIdx: number,
moveSAN: string,
): Promise<string> {
const prompt = `Given the following chess game FEN history (one FEN per move):\n${fenHistory.map((f, i) => `${i + 1}: ${f}`).join("\n")}\nEvaluate the aggression or brilliance of move #${moveIdx + 1} (${moveSAN}). Respond ONLY with a single digit from 1 (not aggressive) to 10 (extremely aggressive/brilliant). Be fast and concise.`;
const response = await callOpenAI(
[
{
role: "system",
content:
"You are a chess grandmaster evaluating move aggression and brilliance. Respond as quickly and concisely as possible.",
},
{ role: "user", content: prompt },
],
16,
);
return response;
}
/**
* Placeholder for LLM-based sacrifice justification.
* Will use OpenAI GPT-4o-mini via callOpenAI in the future.
*/
export async function justifySacrifice(
fenHistory: string[],
moveIdx: number,
moveSAN: string,
): Promise<string> {
const prompt = `Given the following chess game FEN history (one FEN per move):\n${fenHistory.map((f, i) => `${i + 1}: ${f}`).join("\n")}\nWas the sacrifice in move #${moveIdx + 1} (${moveSAN}) justified? Reply in 1 short sentence: is the sacrifice justified or not, and why. Be fast and concise.`;
const response = await callOpenAI(
[
{
role: "system",
content:
"You are a chess grandmaster evaluating sacrifices. Respond as quickly and concisely as possible.",
},
{ role: "user", content: prompt },
],
16,
);
return response;
}
export async function scoreAndJustifyGame(
fenHistory: string[],
moveSANs: string[],
): Promise<{ score: string; justification: string }[]> {
const prompt = `Given the following chess game FEN history (one FEN per move) and the corresponding SAN moves, evaluate each move for aggression/brilliance and sacrifice justification.\n\nFEN history (one per move):\n${fenHistory.map((f, i) => `${i + 1}: ${f}`).join("\n")}\n\nSAN moves (one per move):\n${moveSANs.map((san, i) => `${i + 1}: ${san}`).join("\n")}\n\nFor each move, respond with a JSON array of objects, each with:\n- score: a single digit from 1 (not aggressive) to 10 (extremely aggressive/brilliant)\n- justification: 1 short sentence on whether the move is a justified sacrifice or not, and why.\n\nExample:\n[{"score": "7", "justification": "The sacrifice is risky but justified."}, ...]\n\nRespond ONLY with the JSON array, nothing else.`;
const response = await callOpenAI(
[
{
role: "system",
content:
"You are a chess grandmaster evaluating a full game for aggression and sacrifice justification. Respond as quickly and concisely as possible.",
},
{ role: "user", content: prompt },
],
512,
);
try {
const parsed = JSON.parse(response);
if (Array.isArray(parsed)) {
return parsed;
}
throw new Error("Response is not an array");
} catch (e) {
throw new Error("Failed to parse LLM response as JSON: " + response);
}
}

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/**
* OpenAI API client for GPT-4o-mini feedback.
* Expects to run in Bun/Node.js where process.env is available.
* If you see a type error for 'process', install @types/node as a dev dependency.
*/
import OpenAI from "openai";
import type { ChatCompletionMessageParam } from "openai/resources/chat/completions";
const OPENAI_API_KEY = process.env.OPENAI_API_KEY || "";
const MODEL = "gpt-4o-mini"; // Use gpt-4o-mini if available, else gpt-4o
if (!OPENAI_API_KEY) {
throw new Error("OPENAI_API_KEY is not set");
}
const openai = new OpenAI({ apiKey: OPENAI_API_KEY });
export async function callOpenAI(
messages: ChatCompletionMessageParam[],
max_tokens = 64,
): Promise<string> {
const response = await openai.chat.completions.create({
model: MODEL,
messages,
max_tokens,
});
const content = response.choices[0]?.message?.content;
if (!content) throw new Error("No content returned from OpenAI");
return content.trim();
}

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/**
* Placeholder reward function using LLM feedback.
* Will use OpenAI GPT-4o-mini feedback in the future.
*/
export async function computeReward(
fen: string,
moveSAN: string,
llmScore?: string,
llmJustification?: string,
): Promise<number> {
// TODO: Use real LLM feedback to compute reward
// For now, return a dummy reward
return 0.5;
}

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import { getAggressiveMove } from "../agents/attacker_agent";
import { ChessEnv } from "../env/chess_env";
export async function runTrainingLoop(episodes = 1) {
const env = new ChessEnv();
for (let ep = 0; ep < episodes; ep++) {
env.reset();
let done = false;
while (!done) {
const move = getAggressiveMove(env.getFEN());
if (!move) break;
const { done: isDone } = env.step(move);
done = isDone;
}
// Log or store game
console.log(`Episode ${ep + 1} finished. FEN: ${env.getFEN()}`);
}
}

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import { Chess } from "chess.js";
import { AttackerAgent } from "../agents/attacker_agent";
import { ChessEnv } from "../env/chess_env";
// Simulate user move by picking a random legal move
function getRandomUserMove(fen: string): { from: string; to: string } | null {
const chess = new Chess(fen);
const moves = chess.moves({ verbose: true });
if (moves.length === 0) return null;
const move = moves[Math.floor(Math.random() * moves.length)];
return { from: move.from, to: move.to };
}
export async function runUserVsAgentGame() {
const env = new ChessEnv();
const agent = new AttackerAgent();
let done = false;
let moveCount = 0;
let fen = env.reset();
let userTurn = true;
const gameData: any[] = [];
while (!done && moveCount < 100) {
let move;
let player;
if (userTurn) {
move = getRandomUserMove(fen); // Placeholder for real user input
player = "user";
console.log(`User move:`, move);
} else {
move = agent.getMove(fen);
player = "agent";
console.log(`Agent move:`, move);
}
if (!move) break;
// Placeholder for LLM feedback (to be replaced with real call)
const llmFeedback = { score: 7, justification: "Placeholder feedback" };
const { fen: newFen, reward, done: isDone } = env.step(move);
moveCount++;
gameData.push({
moveNumber: moveCount,
player,
move,
fen: newFen,
reward,
llmFeedback,
});
console.log("FEN:", newFen);
console.log("Reward:", reward);
fen = newFen;
done = isDone;
userTurn = !userTurn;
}
console.log(`User-vs-Agent game finished after ${moveCount} moves.`);
console.log("Game data:", gameData);
}
// If run directly, play a game
(async () => {
await runUserVsAgentGame();
})();

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// API client for DeepSacrifice frontend
export async function fetchLatestGames() {
// TODO: Replace with real fetch
return [{ fen: "startpos", moves: [] }];
}
export async function fetchAgentStatus() {
// TODO: Replace with real fetch
return { gamesPlayed: 0, avgReward: 0 };
}
export async function startTraining() {
// TODO: Replace with real POST
return { started: true };
}

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import { Chess } from "chess.js";
import { Chessground } from "chessground";
import type React from "react";
import { useEffect, useRef } from "react";
import "./chessground.css";
interface ChessBoardProps {
fen: string;
onMove?: (from: string, to: string) => void;
userTurn: boolean;
}
function getTurnColor(fen: string): "white" | "black" {
const parts = fen.split(" ");
return parts[1] === "b" ? "black" : "white";
}
function allSquares(): string[] {
const files = "abcdefgh";
const ranks = "12345678";
const squares: string[] = [];
for (let f = 0; f < 8; f++) {
for (let r = 0; r < 8; r++) {
squares.push(files[f] + ranks[r]);
}
}
return squares;
}
function getDests(fen: string) {
const chess = new Chess(fen);
const dests: Record<string, string[]> = {};
allSquares().forEach((sqr) => {
const moves = chess.moves({ square: sqr as any, verbose: true });
if (moves.length) dests[sqr] = moves.map((m: any) => m.to);
});
// Chessground expects a Map
return new Map(Object.entries(dests));
}
const ChessBoard: React.FC<ChessBoardProps> = ({ fen, onMove, userTurn }) => {
const boardRef = useRef<HTMLDivElement>(null);
const groundRef = useRef<any>(null);
const color = getTurnColor(fen);
const dests = getDests(fen);
useEffect(() => {
if (boardRef.current) {
if (!groundRef.current) {
groundRef.current = Chessground(boardRef.current, {
fen,
orientation: "white",
turnColor: color,
movable: {
color,
dests: dests as any,
free: false,
events: {
after: (orig: string, dest: string) => {
if (onMove && userTurn) onMove(orig, dest);
},
},
},
});
} else {
groundRef.current.set({
fen,
turnColor: color,
orientation: "white",
movable: {
color,
dests: dests as any,
free: false,
events: {
after: (orig: string, dest: string) => {
if (onMove && userTurn) onMove(orig, dest);
},
},
},
});
}
}
}, [
fen,
onMove,
color,
userTurn,
JSON.stringify(Array.from(dests.entries())),
]);
return (
<div
ref={boardRef}
style={{ width: 400, height: 400 }}
/>
);
};
export default ChessBoard;

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.cg-wrap {
box-sizing: content-box;
position: relative;
display: block;
}
cg-container {
position: absolute;
width: 100%;
height: 100%;
display: block;
top: 0;
}
cg-board {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
-webkit-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
line-height: 0;
background-size: cover;
}
.cg-wrap.manipulable cg-board {
cursor: pointer;
}
cg-board square {
position: absolute;
top: 0;
left: 0;
width: 12.5%;
height: 12.5%;
pointer-events: none;
}
cg-board square.move-dest {
pointer-events: auto;
}
cg-board square.last-move {
will-change: transform;
}
.cg-wrap piece {
position: absolute;
top: 0;
left: 0;
width: 12.5%;
height: 12.5%;
background-size: cover;
z-index: 2;
will-change: transform;
pointer-events: none;
}
cg-board piece.dragging {
cursor: move;
/* !important to override z-index from 3D piece inline style */
z-index: 11 !important;
}
piece.anim {
z-index: 8;
}
piece.fading {
z-index: 1;
opacity: 0.5;
}
.cg-wrap piece.ghost {
opacity: 0.3;
}
.cg-wrap piece svg {
overflow: hidden;
position: relative;
top: 0px;
left: 0px;
width: 100%;
height: 100%;
pointer-events: none;
z-index: 2;
opacity: 0.6;
}
.cg-wrap cg-auto-pieces,
.cg-wrap .cg-shapes,
.cg-wrap .cg-custom-svgs {
overflow: visible;
position: absolute;
top: 0px;
left: 0px;
width: 100%;
height: 100%;
pointer-events: none;
}
.cg-wrap cg-auto-pieces {
z-index: 2;
}
.cg-wrap cg-auto-pieces piece {
opacity: 0.3;
}
.cg-wrap .cg-shapes {
overflow: hidden;
opacity: 0.6;
z-index: 2;
}
.cg-wrap .cg-custom-svgs {
/* over piece.anim = 8, but under piece.dragging = 11 */
z-index: 9;
}
.cg-wrap .cg-custom-svgs svg {
overflow: visible;
}
.cg-wrap coords {
position: absolute;
display: flex;
pointer-events: none;
opacity: 0.8;
font-family: sans-serif;
font-size: 9px;
}
.cg-wrap coords.ranks {
left: 4px;
top: -20px;
flex-flow: column-reverse;
height: 100%;
width: 12px;
}
.cg-wrap coords.ranks.black {
flex-flow: column;
}
.cg-wrap coords.ranks.left {
left: -15px;
align-items: flex-end;
}
.cg-wrap coords.files {
bottom: -4px;
left: 24px;
flex-flow: row;
width: 100%;
height: 16px;
text-transform: uppercase;
text-align: center;
}
.cg-wrap coords.files.black {
flex-flow: row-reverse;
}
.cg-wrap coords coord {
flex: 1 1 auto;
}
.cg-wrap coords.ranks coord {
transform: translateY(39%);
}
/** Colored board squares as an embedded SVG */
cg-board {
background-color: #f0d9b5;
background-image: url("data:image/svg+xml;base64,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");
}
/** Interactive board square colors */
cg-board square.move-dest {
background: radial-gradient(
rgba(20, 85, 30, 0.5) 22%,
#208530 0,
rgba(0, 0, 0, 0.3) 0,
rgba(0, 0, 0, 0) 0
);
}
cg-board square.premove-dest {
background: radial-gradient(
rgba(20, 30, 85, 0.5) 22%,
#203085 0,
rgba(0, 0, 0, 0.3) 0,
rgba(0, 0, 0, 0) 0
);
}
cg-board square.oc.move-dest {
background: radial-gradient(
transparent 0%,
transparent 80%,
rgba(20, 85, 0, 0.3) 80%
);
}
cg-board square.oc.premove-dest {
background: radial-gradient(
transparent 0%,
transparent 80%,
rgba(20, 30, 85, 0.2) 80%
);
}
cg-board square.move-dest:hover {
background: rgba(20, 85, 30, 0.3);
}
cg-board square.premove-dest:hover {
background: rgba(20, 30, 85, 0.2);
}
cg-board square.last-move {
background-color: rgba(155, 199, 0, 0.41);
}
cg-board square.selected {
background-color: rgba(20, 85, 30, 0.5);
}
cg-board square.check {
background: radial-gradient(
ellipse at center,
rgba(255, 0, 0, 1) 0%,
rgba(231, 0, 0, 1) 25%,
rgba(169, 0, 0, 0) 89%,
rgba(158, 0, 0, 0) 100%
);
}
cg-board square.current-premove {
background-color: rgba(20, 30, 85, 0.5);
}
/** Alternating colors in rank/file labels */
.cg-wrap.orientation-white coords.ranks coord:nth-child(2n),
.cg-wrap.orientation-white coords.files coord:nth-child(2n),
.cg-wrap.orientation-black coords.ranks coord:nth-child(2n + 1),
.cg-wrap.orientation-black coords.files coord:nth-child(2n + 1) {
color: rgba(72, 72, 72, 0.8);
}
.cg-wrap.orientation-black coords.ranks coord:nth-child(2n),
.cg-wrap.orientation-black coords.files coord:nth-child(2n),
.cg-wrap.orientation-white coords.ranks coord:nth-child(2n + 1),
.cg-wrap.orientation-white coords.files coord:nth-child(2n + 1) {
color: rgba(255, 255, 255, 0.8);
}
/** Embedded SVGs for all chess pieces */
.cg-wrap piece.pawn.white {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.bishop.white {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.knight.white {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.rook.white {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.queen.white {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.king.white {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.pawn.black {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.bishop.black {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.knight.black {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.rook.black {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.queen.black {
background-image: url("data:image/svg+xml;base64,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");
}
.cg-wrap piece.king.black {
background-image: url("data:image/svg+xml;base64,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");
}

View file

@ -0,0 +1,18 @@
/* IBM Plex Sans for body, IBM Plex Mono for code/pre/monospace */
* {
box-sizing: border-box;
margin: 0;
padding: 0;
}
body {
font-family: "IBM Plex Sans", Arial, sans-serif;
}
code,
pre,
kbd,
samp {
font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono",
Menlo, monospace;
}

View file

@ -0,0 +1,16 @@
import "./index.css";
import React from "react";
import { createRoot } from "react-dom/client";
import GameView from "./pages/GameView";
const rootElement = document.getElementById("root");
if (!rootElement) {
throw new Error("Root element not found");
}
const root = createRoot(rootElement);
root.render(
<React.StrictMode>
<GameView />
</React.StrictMode>,
);

View file

@ -0,0 +1,486 @@
import type React from "react";
import { useEffect, useState } from "react";
import ChessBoard from "../components/ChessBoard";
interface MoveData {
move: { from: string; to: string; san?: string };
fen: string;
reward: number;
llmFeedback: { score: string; justification: string };
}
const initialFen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
const GameView: React.FC = () => {
const [fen, setFen] = useState<string>(initialFen);
const [moveHistory, setMoveHistory] = useState<MoveData[]>([]);
const [feedback, setFeedback] = useState<null | {
score: string;
justification: string;
reward: number;
}>(null);
const [userTurn, setUserTurn] = useState<boolean>(true);
const [gameOver, setGameOver] = useState<boolean>(false);
const [scoring, setScoring] = useState(false);
const [scored, setScored] = useState(false);
// Start a new game (reset backend state and local state)
const startNewGame = async () => {
const res = await fetch("/api/reset", { method: "POST" });
const data = await res.json();
setFen(data.fen || initialFen);
setMoveHistory([]);
setFeedback(null);
setUserTurn(true);
setGameOver(false);
setScored(false);
};
useEffect(() => {
startNewGame();
}, []);
// Helper to call backend for a move
const makeMove = async (from: string, to: string) => {
const res = await fetch("/api/move", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ from, to }),
});
const data = await res.json();
// If backend returns moves array (user + agent)
if (Array.isArray(data.moves)) {
setMoveHistory((prev) => [
...prev,
...data.moves.map((m: any) => ({
move: m.move,
fen: m.fen,
reward: m.reward,
llmFeedback: m.llmFeedback,
})),
]);
// Set FEN to the last move's FEN
const lastMove = data.moves[data.moves.length - 1];
setFen(lastMove.fen);
setFeedback({
score: lastMove.llmFeedback?.score,
justification: lastMove.llmFeedback?.justification,
reward: lastMove.reward,
});
if (data.done) setGameOver(true);
return data;
}
// fallback for old response shape
setFen(data.fen);
setFeedback({
score: data.llmFeedback?.score,
justification: data.llmFeedback?.justification,
reward: data.reward,
});
setMoveHistory((prev) => [
...prev,
{
move: { from, to },
fen: data.fen,
reward: data.reward,
llmFeedback: data.llmFeedback,
},
]);
if (data.done) setGameOver(true);
return data;
};
// User move handler
const handleMove = async (from: string, to: string) => {
if (!userTurn || gameOver) return;
setUserTurn(false);
const data = await makeMove(from, to);
// After both moves (user + agent), re-enable user input if game not over
if (!data.done) {
setTimeout(() => {
setUserTurn(true);
}, 500); // Small delay for UX
}
};
// Score the game after it ends
const scoreGame = async () => {
setScoring(true);
try {
const res = await fetch("/api/game/llm_feedback", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({ moves: moveHistory }),
});
const data = await res.json();
if (Array.isArray(data.moves)) {
setMoveHistory(data.moves);
setScored(true);
}
} finally {
setScoring(false);
}
};
return (
<div
style={{
background: "#fff",
minHeight: "100vh",
height: "100vh",
fontFamily: "monospace",
color: "#111",
padding: 0,
margin: 0,
border: "8px solid #111",
boxSizing: "border-box",
display: "flex",
flexDirection: "column",
}}
>
{/* Toolbar */}
<div
style={{
display: "flex",
flexDirection: "row",
alignItems: "center",
borderBottom: "4px solid #111",
background: "#fff",
padding: "0 12px",
minHeight: 40,
height: 40,
gap: 16,
}}
>
<span
style={{
fontWeight: 900,
fontSize: 18,
letterSpacing: 1,
marginRight: 16,
textTransform: "uppercase",
userSelect: "none",
}}
>
<span style={{ fontWeight: 400 }}>Deep</span>Sacrifice
</span>
<button
onClick={startNewGame}
style={{
fontWeight: 900,
fontSize: 12,
border: "2px solid #111",
background: "#fff",
color: "#111",
padding: "2px 10px",
cursor: "pointer",
textTransform: "uppercase",
boxShadow: "none",
borderRadius: 0,
height: 28,
lineHeight: "24px",
alignSelf: "center",
}}
>
New Game
</button>
</div>
<div
style={{
display: "flex",
flexDirection: "row",
flex: 1,
minHeight: 0,
minWidth: 0,
justifyContent: "space-between",
alignItems: "stretch",
padding: 16,
gap: 24,
}}
>
<div
style={{
flex: "0 0 auto",
display: "flex",
alignItems: "center",
justifyContent: "center",
}}
>
<ChessBoard
fen={fen}
onMove={handleMove}
userTurn={userTurn && !gameOver}
/>
</div>
<div
style={{
flex: 1,
display: "flex",
flexDirection: "column",
minWidth: 0,
}}
>
<div
style={{
marginBottom: 8,
display: "flex",
flexDirection: "row",
alignItems: "center",
gap: 12,
}}
>
{!scored ? (
<button
onClick={scoreGame}
disabled={scoring}
style={{
fontWeight: 700,
fontSize: 14,
border: "2px solid #111",
background: scoring ? "#eee" : "#fff",
color: scoring ? "#aaa" : "#111",
padding: "2px 10px",
cursor: scoring ? "not-allowed" : "pointer",
textTransform: "uppercase",
borderRadius: 0,
height: 28,
lineHeight: "24px",
alignSelf: "center",
opacity: scoring ? 0.7 : 1,
}}
>
{scoring ? "Scoring..." : "Score Game"}
</button>
) : (
<button
onClick={startNewGame}
style={{
fontWeight: 700,
fontSize: 14,
border: "2px solid #111",
background: "#fff",
color: "#111",
padding: "2px 10px",
cursor: "pointer",
textTransform: "uppercase",
borderRadius: 0,
height: 28,
lineHeight: "24px",
alignSelf: "center",
}}
>
New Game
</button>
)}
</div>
{gameOver && (
<div
style={{
color: "#fff",
background: "#111",
marginBottom: 8,
padding: 8,
fontWeight: 900,
border: "2px solid #111",
borderRadius: 0,
textAlign: "center",
letterSpacing: 1,
}}
>
Game Over
</div>
)}
{feedback && null}
<div
style={{
flex: 1,
minHeight: 0,
display: "flex",
flexDirection: "column",
fontSize: 13,
lineHeight: 1.3,
}}
>
<div
style={{
flex: 1,
minHeight: 0,
overflow: "hidden",
display: "flex",
flexDirection: "column",
}}
>
<div
style={{
flex: 1,
minHeight: 0,
overflowY: "auto",
width: "100%",
}}
>
<table
style={{
width: "100%",
borderCollapse: "collapse",
background: "#fff",
fontFamily: "monospace",
tableLayout: "fixed",
fontSize: 12,
}}
>
<thead>
<tr>
<th
style={{
border: "2px solid #111",
padding: 6,
fontWeight: 900,
background: "#eee",
textAlign: "left",
width: "8%",
minWidth: 40,
maxWidth: 60,
}}
>
#
</th>
<th
style={{
border: "2px solid #111",
padding: 6,
fontWeight: 900,
background: "#eee",
textAlign: "left",
width: "32%",
minWidth: 80,
maxWidth: 120,
}}
>
Move
</th>
<th
style={{
border: "2px solid #111",
padding: 6,
fontWeight: 900,
background: "#eee",
textAlign: "left",
width: "30%",
minWidth: 60,
maxWidth: 100,
}}
>
Reward
</th>
<th
style={{
border: "2px solid #111",
padding: 6,
fontWeight: 900,
background: "#eee",
textAlign: "left",
width: "30%",
minWidth: 60,
maxWidth: 100,
}}
>
LLM Score
</th>
<th
style={{
border: "2px solid #111",
padding: 6,
fontWeight: 900,
background: "#eee",
textAlign: "left",
width: "50%",
minWidth: 100,
maxWidth: 300,
}}
>
Justification
</th>
</tr>
</thead>
<tbody>
{moveHistory.map((m, i) => (
<tr key={i}>
<td
style={{
border: "2px solid #111",
padding: 6,
width: "8%",
minWidth: 40,
maxWidth: 60,
}}
>
{i + 1}
</td>
<td
style={{
border: "2px solid #111",
padding: 6,
width: "32%",
minWidth: 80,
maxWidth: 120,
}}
>
{m.move.from}-{m.move.to}
</td>
<td
style={{
border: "2px solid #111",
padding: 6,
width: "30%",
minWidth: 60,
maxWidth: 100,
}}
>
{m.reward === null || m.reward === undefined
? ""
: m.reward}
</td>
<td
style={{
border: "2px solid #111",
padding: 6,
width: "30%",
minWidth: 60,
maxWidth: 100,
}}
>
{m.llmFeedback?.score === null ||
m.llmFeedback?.score === undefined
? ""
: m.llmFeedback.score}
</td>
<td
style={{
border: "2px solid #111",
padding: 6,
width: "50%",
minWidth: 100,
maxWidth: 300,
}}
>
{m.llmFeedback?.justification === null ||
m.llmFeedback?.justification === undefined
? ""
: m.llmFeedback.justification}
</td>
</tr>
))}
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
);
};
export default GameView;

View file

@ -0,0 +1,16 @@
import react from "@vitejs/plugin-react";
import { defineConfig } from "vite";
export default defineConfig({
plugins: [react()],
server: {
open: true,
// Local server runs on 3001, so we need to proxy requests to 3000
proxy: {
"/api": {
target: "http://localhost:3001",
changeOrigin: true,
},
},
},
});