Detects pawn endgame positions with multiple advanced passed or candidate passed pawns on both sides, often involving zugzwang.
SAE concept sae_7850 fires when detects pawn endgame positions with multiple advanced passed or candidate passed pawns on both sides, often involving zugzwang.. It appears in 98 of 9,950 Climbchess puzzles (1.0%), spanning ELO 625–2695 (median 1790).
Free forever · no email · no signup · delete data anytime.
This page documents Detects pawn endgame positions with multiple…, 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:
Detects pawn endgame positions with multiple advanced passed or candidate passed pawns on both sides, often involving zugzwang.
This pattern fires in 98 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 625 to 2695, with a median rating of 1790. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_7850 |
|---|---|
| Puzzles where it fires | 98 |
| Min ELO | 625 |
| Median ELO | 1790 |
| Max ELO | 2695 |
| Coverage | 0.98% 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 00aU5 — ELO 625, themes: crushing, endgame, master, side to move: Black
- Puzzle zfyRp — ELO 835, themes: crushing, endgame, long, side to move: Black
- Puzzle zXHxU_F — ELO 1156, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle 01Uvy_M — ELO 1245, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle z7phj_F — ELO 1489, themes: crushing, endgame, pawnEndgame, side to move: White
- Puzzle 01aJJ_F — ELO 1790, themes: crushing, endgame, long, side to move: Black
- Puzzle 012wW_M — ELO 1825, themes: crushing, endgame, pawnEndgame, side to move: Black
- Puzzle zX4Wb — ELO 1998, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle zsYW7_F — ELO 2405, themes: crushing, defensiveMove, endgame, side to move: White
- Puzzle z6KPV — ELO 2533, themes: crushing, endgame, pawnEndgame, 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_7850?
Detects pawn endgame positions with multiple advanced passed or candidate passed pawns on both sides, often involving zugzwang. 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 98 tagged puzzles (1.0% of the set), spanning Lichess ELO 625 to 2695 with a median of 1790.
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.