Update README.md

README.md

@@ -5,11 +5,32 @@ viewer: false
 
 # Aix-compatible Lichess database
 
-**This database is not complete yet!**
-
-This dataset contains the [Lichess database](https://database.lichess.org/) of 7+ billion chess games, but in a format queryable using [Aix](https://github.com/thomas-daniels/aix), with the `aixchess` extension for DuckDB.
+This dataset contains the [Lichess database](https://database.lichess.org/) of 7+ billion chess games, but in a format queryable using [Aix](https://github.com/thomas-daniels/aix), with the [`aixchess` extension for DuckDB](https://duckdb.org/community_extensions/extensions/aixchess).
 Three compression levels (Low, Medium, and High) are offered for the chess game encoding, enabling a trade-off between decoding speed and size. The Parquet files themselves are all zstd-compressed at level 19.
 
 Generated using [pgn-to-aix](https://github.com/thomas-daniels/aix/tree/main/pgn-to-aix).
 
-See [my blog post](https://thomasd.be/2026/02/01/aix-storing-querying-chess-games.html) for more details.
+See [my blog post](https://thomasd.be/2026/02/01/aix-storing-querying-chess-games.html) for more details.
+
+Example DuckDB commands:
+```sql
+INSTALL aixchess FROM community;
+LOAD aixchess;
+
+-- Count en passant moves played in Lichess games from January 2013
+
+WITH lichess_2013_01 AS (
+    FROM 'hf://datasets/thomasd1/aix-lichess-database/low_compression/aix_lichess_2013-01_low.parquet'
+),
+en_passant_move_count AS (
+    SELECT
+        SUM(
+            move_details(movedata).filter(lambda m: m.is_en_passant).length()
+        ) AS nb_ep_moves 
+    FROM lichess_2013_01
+)
+
+FROM en_passant_move_count;
+
+-- Result: 3496
+```