A black rook under pressure from white pieces in an endgame or tactical position, often but not exclusively on high ranks.
SAE concept sae_1643 fires when a black rook under pressure from white pieces in an endgame or tactical position, often but not exclusively on high ranks.. It appears in 156 of 9,950 Climbchess puzzles (1.6%), spanning ELO 612–2601 (median 1134).
Free forever · no email · no signup · delete data anytime.
This page documents A black rook under pressure from white pieces in…, 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 black rook under pressure from white pieces in an endgame or tactical position, often but not exclusively on high ranks.
This pattern fires in 156 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 612 to 2601, with a median rating of 1134. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_1643 |
|---|---|
| Puzzles where it fires | 156 |
| Min ELO | 612 |
| Median ELO | 1134 |
| Max ELO | 2601 |
| Coverage | 1.57% 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 01fya — ELO 612, themes: endgame, mate, mateIn1, side to move: Black
- Puzzle yoGiT — ELO 731, themes: clearance, crushing, endgame, side to move: Black
- Puzzle uhWxQ_F — ELO 833, themes: backRankMate, endgame, mate, side to move: White
- Puzzle zywD9 — ELO 879, themes: endgame, hangingPiece, mate, side to move: White
- Puzzle zzbXW — ELO 1029, themes: kingsideAttack, mate, mateIn2, side to move: White
- Puzzle zytIA_M — ELO 1134, themes: advantage, endgame, fork, side to move: White
- Puzzle 00i6P_F — ELO 1345, themes: advantage, endgame, long, side to move: White
- Puzzle zuAki_F — ELO 1537, themes: backRankMate, endgame, mate, side to move: White
- Puzzle zzpwy_M — ELO 1668, themes: crushing, deflection, long, side to move: White
- Puzzle yzTAz_F — ELO 1969, themes: advantage, endgame, fork, side to move: White
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_1643?
A black rook under pressure from white pieces in an endgame or tactical position, often but not exclusively on high ranks. 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 156 tagged puzzles (1.6% of the set), spanning Lichess ELO 612 to 2601 with a median of 1134.
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.