Rook endgame with a king-centralisation or fork motif, often with mutual pawn weaknesses and active king play.
SAE concept sae_8615 fires when rook endgame with a king-centralisation or fork motif, often with mutual pawn weaknesses and active king play.. It appears in 73 of 9,950 Climbchess puzzles (0.7%), spanning ELO 723–2680 (median 1748).
Free forever · no email · no signup · delete data anytime.
This page documents Rook endgame with a king-centralisation or fork…, 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:
Rook endgame with a king-centralisation or fork motif, often with mutual pawn weaknesses and active king play.
This pattern fires in 73 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 723 to 2680, with a median rating of 1748. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_8615 |
|---|---|
| Puzzles where it fires | 73 |
| Min ELO | 723 |
| Median ELO | 1748 |
| Max ELO | 2680 |
| Coverage | 0.73% 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 zxvtr — ELO 723, themes: crushing, endgame, fork, side to move: Black
- Puzzle zzQRF_F — ELO 948, themes: crushing, endgame, fork, side to move: White
- Puzzle xNepc_M — ELO 1182, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zVSJl_F — ELO 1397, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zmOkq — ELO 1705, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle yuAEu_M — ELO 1748, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zzzOI — ELO 1903, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zyP9Z_M — ELO 1990, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zeSQD — ELO 2236, themes: crushing, endgame, long, side to move: White
- Puzzle zbSJ2_F — ELO 2501, themes: crushing, endgame, long, 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_8615?
Rook endgame with a king-centralisation or fork motif, often with mutual pawn weaknesses and active king play. 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 73 tagged puzzles (0.7% of the set), spanning Lichess ELO 723 to 2680 with a median of 1748.
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.