README.md

---
license: mit
task_categories:
- text-generation
- reinforcement-learning
language:
- en
tags:
- chess
- games
- pgn
- strategy
- board-games
pretty_name: Oden WorldChess Dataset
size_categories:
- 1M<n<10M
dataset_info:
  features:
  - name: event
    dtype: string
  - name: site
    dtype: string
  - name: date
    dtype: string
  - name: round
    dtype: string
  - name: white
    dtype: string
  - name: black
    dtype: string
  - name: result
    dtype: string
  - name: white_elo
    dtype: string
  - name: black_elo
    dtype: string
  - name: eco
    dtype: string
  - name: opening
    dtype: string
  - name: variation
    dtype: string
  - name: white_title
    dtype: string
  - name: black_title
    dtype: string
  - name: time_control
    dtype: string
  - name: termination
    dtype: string
  - name: moves
    sequence: string
  - name: moves_san
    dtype: string
  - name: positions_fen
    sequence: string
  - name: num_moves
    dtype: int32
  - name: tags
    sequence: string
  - name: source_file
    dtype: string
  - name: all_headers
    dtype: string
  splits:
  - name: train
    num_examples: 4047908
---

# Oden Chess Dataset

<div align="center">
  <img src="https://images.unsplash.com/photo-1528819622765-d6bcf132f793?w=800" alt="Chess pieces" width="600">
</div>

## Dataset Summary

The **Oden Chess Dataset** is a comprehensive collection of over 4 million chess games compiled from top players, major tournaments, and categorized by opening systems. This dataset provides rich annotations including move sequences, board positions, player information, and game metadata, making it ideal for chess AI research, opening analysis, and statistical studies.

## Dataset Details

- **Total Games**: 4,047,908
- **Source Files**: 299 PGN files
- **Total Size**: ~2.6 GB (original PGN format)
- **Total SizeHF**: 10.1 GB
- **Time Period**: Historical games to 2024
- **Languages**: English (PGN notation is universal)

## Dataset Structure

### Data Fields

Each game in the dataset contains the following fields:

| Field | Type | Description |
|-------|------|-------------|
| `event` | string | Tournament or match name |
| `site` | string | Location where the game was played |
| `date` | string | Date in YYYY.MM.DD format |
| `round` | string | Round number in tournament |
| `white` | string | Name of player with white pieces |
| `black` | string | Name of player with black pieces |
| `result` | string | Game result: "1-0" (white wins), "0-1" (black wins), "1/2-1/2" (draw), "*" (unfinished) |
| `white_elo` | string | White player's ELO rating |
| `black_elo` | string | Black player's ELO rating |
| `eco` | string | Encyclopedia of Chess Openings (ECO) code |
| `opening` | string | Opening name |
| `variation` | string | Opening variation |
| `white_title` | string | White player's title (GM, IM, FM, etc.) |
| `black_title` | string | Black player's title |
| `time_control` | string | Time control format |
| `termination` | string | How the game ended |
| `moves` | list[string] | List of moves in Standard Algebraic Notation (SAN) |
| `moves_san` | string | All moves as a single string |
| `positions_fen` | list[string] | Board position in FEN notation after each move |
| `num_moves` | int32 | Total number of moves in the game |
| `tags` | list[string] | Categorical tags based on source |
| `source_file` | string | Original PGN filename |
| `all_headers` | string | JSON string of all PGN headers |

### Data Organization

The dataset is organized into three main categories:

1. **Players**: Games from individual top players including world champions and grandmasters
2. **Openings**: Games categorized by opening systems:
   - Classical King Pawn (e.g., Italian Game, Spanish Opening)
   - Classical Queen Pawn (e.g., Queen's Gambit)
   - Modern King Pawn (e.g., Sicilian Defense, French Defense)
   - Modern Queen Pawn (e.g., King's Indian, Nimzo-Indian)
   - Flank and Unorthodox (e.g., English Opening, Bird's Opening)
3. **Tournaments**: Games from major championships including World Championships, Candidates tournaments, and other elite events

## Usage Examples

### Loading the Dataset

```python
from datasets import load_dataset

# Load the full dataset
dataset = load_dataset("BBSRguy/Oden-worldchess")

# Access the training split
chess_games = dataset['train']

# View a sample game
sample_game = chess_games[0]
print(f"White: {sample_game['white']} ({sample_game['white_elo']})")
print(f"Black: {sample_game['black']} ({sample_game['black_elo']})")
print(f"Result: {sample_game['result']}")
print(f"Opening: {sample_game['eco']} - {sample_game['opening']}")
print(f"Moves: {sample_game['moves_san'][:50]}...")
```

### Filtering Games

```python
# Filter games by player
carlsen_games = chess_games.filter(
    lambda x: 'Carlsen' in x['white'] or 'Carlsen' in x['black']
)

# Filter games by opening
sicilian_games = chess_games.filter(
    lambda x: x['eco'].startswith('B') if x['eco'] else False
)

# Filter games by result
decisive_games = chess_games.filter(
    lambda x: x['result'] in ['1-0', '0-1']
)

# Filter long games
long_games = chess_games.filter(
    lambda x: x['num_moves'] > 100
)
```

### Analyzing Positions

```python
import chess
import chess.svg

# Reconstruct a game position
game = chess_games[0]
board = chess.Board()

# Play through the moves
for move in game['moves']:
    board.push_san(move)

# Or directly load a position
position_after_10_moves = game['positions_fen'][10]
board = chess.Board(position_after_10_moves)
```

### Statistical Analysis

```python
import pandas as pd

# Convert to pandas for analysis
df = chess_games.to_pandas()

# Result distribution
print(df['result'].value_counts())

# Most common openings
print(df['eco'].value_counts().head(10))

# Average game length by result
print(df.groupby('result')['num_moves'].mean())

# Top players by number of games
all_players = pd.concat([df['white'], df['black']])
print(all_players.value_counts().head(20))
```

## Applications

This dataset is suitable for:

1. **Chess Engine Development**
   - Training neural networks for position evaluation
   - Move prediction and game analysis
   - Opening book generation

2. **Statistical Analysis**
   - Player performance metrics
   - Opening popularity and success rates
   - Game length patterns
   - ELO rating analysis

3. **Machine Learning Research**
   - Sequence modeling with chess moves
   - Pattern recognition in positions
   - Reinforcement learning for chess AI

4. **Educational Tools**
   - Opening repertoire builders
   - Tactical pattern recognition
   - Historical game analysis

## Dataset Creation

### Source Data

The dataset was compiled from publicly available PGN files including:
- Individual collections of top-rated players
- Major tournament archives
- Opening-specific game collections

### Processing

Games were processed to:
- Extract all metadata from PGN headers
- Convert moves to a standardized format
- Generate FEN positions for each move
- Categorize games by source type
- Handle various PGN format variations

## Considerations

### Data Quality

- Some games may have incomplete metadata (missing ELO ratings, dates, etc.)
- A small number of games contain annotation errors from source files
- Time controls and termination reasons may not be available for older games

### Ethical Considerations

- All games are from public sources and chess games are not copyrightable
- Player names are included as they appear in public tournament records
- No private or sensitive information is included

## Citation

If you use this dataset in your research, please cite:

```bibtex
@dataset{oden-worldchess,
  title = {Oden World Chess Dataset},
  author = {BBSRguy},
  year = {2025},
  month = {6},
  publisher = {HuggingFace},
  howpublished = {\url{https://huggingface.co/datasets/BBSRguy/Oden-worldchess}},
  note = {A comprehensive chess dataset with 4M+ games from top players and tournaments}
}
```

## License

This dataset is released under the MIT License. Chess games themselves are factual records of public events and are not subject to copyright.

## Acknowledgments

Thanks to all the chess organizations, players, and enthusiasts who have made these games publicly available for analysis and study. 😊 🙏