A white piece directly attacking a loose black major piece, often as a forcing tactic in an endgame or simplification sequence.
SAE concept sae_14857 fires when a white piece directly attacking a loose black major piece, often as a forcing tactic in an endgame or simplification sequence.. It appears in 44 of 9,950 Climbchess puzzles (0.4%), spanning ELO 632–2577 (median 1202).
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This page documents A white piece directly attacking a loose black…, 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 piece directly attacking a loose black major piece, often as a forcing tactic in an endgame or simplification sequence.
This pattern fires in 44 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 632 to 2577, with a median rating of 1202. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_14857 |
|---|---|
| Puzzles where it fires | 44 |
| Min ELO | 632 |
| Median ELO | 1202 |
| Max ELO | 2577 |
| Coverage | 0.44% 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 zzvVe_F — ELO 729, themes: endgame, master, mate, side to move: Black
- Puzzle zx4cw_M — ELO 858, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zxPym_M — ELO 1007, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle 00QCD — ELO 1041, themes: advantage, middlegame, short, side to move: Black
- Puzzle zv1cI_M — ELO 1202, themes: crushing, endgame, hangingPiece, side to move: Black
- Puzzle zxm0y — ELO 2022, themes: advantage, endgame, long, side to move: White
- Puzzle zitA3_F — ELO 2030, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle ze9kl — ELO 2462, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zzVsF_F — ELO 2465, themes: crushing, endgame, long, 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_14857?
A white piece directly attacking a loose black major piece, often as a forcing tactic in an endgame or simplification sequence. 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 44 tagged puzzles (0.4% of the set), spanning Lichess ELO 632 to 2577 with a median of 1202.
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.