How to use from
SGLang
Install from pip and serve model
# Install SGLang from pip:
pip install sglang
# Start the SGLang server:
python3 -m sglang.launch_server \
    --model-path "DedeProGames/Checkmate-5M" \
    --host 0.0.0.0 \
    --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "DedeProGames/Checkmate-5M",
		"prompt": "Once upon a time,",
		"max_tokens": 512,
		"temperature": 0.5
	}'
Use Docker images
docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    -v ~/.cache/huggingface:/root/.cache/huggingface \
    --env "HF_TOKEN=<secret>" \
    --ipc=host \
    lmsysorg/sglang:latest \
    python3 -m sglang.launch_server \
        --model-path "DedeProGames/Checkmate-5M" \
        --host 0.0.0.0 \
        --port 30000
# Call the server using curl (OpenAI-compatible API):
curl -X POST "http://localhost:30000/v1/completions" \
	-H "Content-Type: application/json" \
	--data '{
		"model": "DedeProGames/Checkmate-5M",
		"prompt": "Once upon a time,",
		"max_tokens": 512,
		"temperature": 0.5
	}'
Quick Links

Checkmate-5M

A tiny chess move model built for the Chess LLM Arena.

  • Architecture: Pythia / GPT-NeoX (6 layers, hidden size 128, 4 heads), trained from scratch.
  • Parameters: 4.8M
  • Tokenizer: move-level chess tokenizer: one token per SAN move (without +/#), plus the move-number prompt 1. and single SAN characters. Every legal SAN move is a single token.
  • Training: the move-selection policy was optimized with reinforcement learning (policy gradient) on millions of simulated games against the models at the top of the arena leaderboard, then distilled into the network.
  • Best used as White.

Usage in the arena

Type DedeProGames/Checkmate-5M as the White model in the arena and press Fight!.

Usage with transformers + outlines

import chess, re
import outlines.models as models
from outlines import generate

model = models.transformers("DedeProGames/Checkmate-5M")
board = chess.Board()
legal = "|".join(re.escape(re.sub(r"[+#]", "", board.san(m))) for m in board.legal_moves)
print(generate.regex(model, legal)("1."))
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