A white rook in an active endgame position, often on an open file or rank, with the king nearby.
SAE concept sae_4463 fires when a white rook in an active endgame position, often on an open file or rank, with the king nearby.. It appears in 72 of 9,950 Climbchess puzzles (0.7%), spanning ELO 632–2683 (median 1329).
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This page documents A white rook in an active endgame position…, one of 4,505 interpretable chess concepts extracted from Leela Chess Zero via sparse autoencoders. The full feature description from our SAE labelling pipeline reads:
A white rook in an active endgame position, often on an open file or rank, with the king nearby.
This pattern fires in 72 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 632 to 2683, with a median rating of 1329. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_4463 |
|---|---|
| Puzzles where it fires | 72 |
| Min ELO | 632 |
| Median ELO | 1329 |
| Max ELO | 2683 |
| Coverage | 0.72% of puzzle set |
Related concepts
The five concepts most often co-firing alongside this one (Jaccard similarity over the puzzle co-occurrence graph) are:
Example puzzles
Below are 10 puzzles spanning the rating distribution. Each links to its own page with full move list and related concepts.
- Puzzle zujzx — ELO 632, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle zsZPX — ELO 815, themes: backRankMate, endgame, long, side to move: Black
- Puzzle zxoAT_F — ELO 864, themes: crushing, endgame, fork, side to move: White
- Puzzle zaqkO_M — ELO 988, themes: advantage, exposedKing, fork, side to move: Black
- Puzzle zv1cI — ELO 1202, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle zzE0P_F — ELO 1329, themes: advantage, endgame, hangingPiece, side to move: White
- Puzzle zvO12_M — ELO 1390, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle zvdfa — ELO 1959, themes: advancedPawn, crushing, fork, side to move: Black
- Puzzle zwf8S_M — ELO 2177, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle zzhC4_M — ELO 2488, themes: advantage, attraction, kingsideAttack, side to move: Black
How to use this page
If you want to train this pattern, open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer surfaces them at the right difficulty for your current rating, and tracks how often you spot the cue versus miss it. You can also browse the related concepts above to see neighbouring ideas in feature space.
Climbchess concepts are not heuristics written by a human author. Each one corresponds to a single direction in the residual stream of Leela Chess Zero that activates on a specific board feature, then was labelled by reading the top-activating positions. This makes the catalogue exhaustive (every Leela-detectable pattern is in here somewhere) and falsifiable (you can replay our extraction).
Frequently asked
What is SAE concept sae_4463?
A white rook in an active endgame position, often on an open file or rank, with the king nearby. It is one of 4,505 interpretable features extracted from Leela Chess Zero's residual stream via sparse autoencoders, then labelled by reading the top-activating positions.
Where does this pattern appear?
In 72 tagged puzzles (0.7% of the set), spanning Lichess ELO 632 to 2683 with a median of 1329.
How do I train it?
Open the Climbchess trainer and filter for puzzles tagged with this concept. The trainer adapts difficulty using your live recognition profile and tracks how often you spot the cue versus miss it.
Is it free?
Yes. Climbchess is free forever, with no account, email, or signup required. You can delete your data at any time.