King and pawn endgame with a fork or zugzwang motif, typically involving passed pawns or a king forced into opposition.
SAE concept sae_6627 fires when king and pawn endgame with a fork or zugzwang motif, typically involving passed pawns or a king forced into opposition.. It appears in 62 of 9,950 Climbchess puzzles (0.6%), spanning ELO 723–2680 (median 1397).
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This page documents King and pawn endgame with a fork or zugzwang…, 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:
King and pawn endgame with a fork or zugzwang motif, typically involving passed pawns or a king forced into opposition.
This pattern fires in 62 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 723 to 2680, with a median rating of 1397. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_6627 |
|---|---|
| Puzzles where it fires | 62 |
| Min ELO | 723 |
| Median ELO | 1397 |
| Max ELO | 2680 |
| Coverage | 0.62% 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 zN1WI — ELO 1118, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zwyZj_M — ELO 1186, themes: attraction, crushing, endgame, side to move: White
- Puzzle z0mjO_M — ELO 1280, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zybrY_F — ELO 1374, themes: crushing, endgame, master, side to move: White
- Puzzle zVSJl_M — ELO 1397, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle 015JV_M — ELO 1719, themes: advantage, endgame, pawnEndgame, side to move: Black
- Puzzle zyc2q_F — ELO 1854, themes: crushing, endgame, long, side to move: Black
- Puzzle zeTro_M — ELO 2045, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle yklvs_M — ELO 2274, themes: bishopEndgame, crushing, 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_6627?
King and pawn endgame with a fork or zugzwang motif, typically involving passed pawns or a king forced into opposition. 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 62 tagged puzzles (0.6% of the set), spanning Lichess ELO 723 to 2680 with a median of 1397.
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.