Pawn endgame or minor-piece endgame where control of a central outpost on ranks 5–6 is the key positional factor determining the result.
SAE concept sae_6138 fires when pawn endgame or minor-piece endgame where control of a central outpost on ranks 5–6 is the key positional factor determining the result.. It appears in 21 of 9,950 Climbchess puzzles (0.2%), spanning ELO 835–2526 (median 1489).
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This page documents Pawn endgame or minor-piece endgame where…, 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:
Pawn endgame or minor-piece endgame where control of a central outpost on ranks 5–6 is the key positional factor determining the result.
This pattern fires in 21 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 835 to 2526, with a median rating of 1489. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_6138 |
|---|---|
| Puzzles where it fires | 21 |
| Min ELO | 835 |
| Median ELO | 1489 |
| Max ELO | 2526 |
| Coverage | 0.21% 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 uApkg — ELO 835, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle uApkg_M — ELO 835, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle zrkjY_F — ELO 969, themes: bishopEndgame, crushing, endgame, side to move: White
- Puzzle zvZgm_M — ELO 996, themes: crushing, endgame, short, side to move: Black
- Puzzle z7phj — ELO 1489, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle z7phj_M — ELO 1489, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zzExe — ELO 1875, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zzExe_M — ELO 1875, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zo3a0_F — ELO 2328, themes: advancedPawn, crushing, endgame, side to move: Black
- Puzzle zzfwZ — ELO 2526, themes: crushing, defensiveMove, endgame, 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_6138?
Pawn endgame or minor-piece endgame where control of a central outpost on ranks 5–6 is the key positional factor determining the result. 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 21 tagged puzzles (0.2% of the set), spanning Lichess ELO 835 to 2526 with a median of 1489.
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.