Advanced passed pawn threatening promotion in an endgame, where the race to queen and piece coordination around the queening square are decisive.
SAE concept sae_2119 fires when advanced passed pawn threatening promotion in an endgame, where the race to queen and piece coordination around the queening square are decisive.. It appears in 190 of 9,950 Climbchess puzzles (1.9%), spanning ELO 610–2572 (median 1653).
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This page documents Advanced passed pawn threatening promotion in an…, 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:
Advanced passed pawn threatening promotion in an endgame, where the race to queen and piece coordination around the queening square are decisive.
This pattern fires in 190 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 610 to 2572, with a median rating of 1653. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_2119 |
|---|---|
| Puzzles where it fires | 190 |
| Min ELO | 610 |
| Median ELO | 1653 |
| Max ELO | 2572 |
| Coverage | 1.91% 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 ydABK — ELO 610, themes: crushing, endgame, hangingPiece, side to move: White
- Puzzle zlNFE_M — ELO 712, themes: advancedPawn, backRankMate, endgame, side to move: Black
- Puzzle zJGoD_M — ELO 1111, themes: advancedPawn, crushing, endgame, side to move: White
- Puzzle zpqLt_F — ELO 1291, themes: crushing, defensiveMove, endgame, side to move: Black
- Puzzle zyFs4_F — ELO 1415, themes: advancedPawn, crushing, deflection, side to move: Black
- Puzzle zpr2o_F — ELO 1653, themes: advancedPawn, bishopEndgame, crushing, side to move: Black
- Puzzle zyBYh_F — ELO 1852, themes: advancedPawn, crushing, defensiveMove, side to move: White
- Puzzle zrgbB_F — ELO 2055, themes: advancedPawn, bishopEndgame, crushing, side to move: Black
- Puzzle zyQI6_M — ELO 2282, themes: advancedPawn, advantage, endgame, side to move: White
- Puzzle zqIlZ — ELO 2429, themes: advancedPawn, crushing, deflection, 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_2119?
Advanced passed pawn threatening promotion in an endgame, where the race to queen and piece coordination around the queening square are decisive. 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 190 tagged puzzles (1.9% of the set), spanning Lichess ELO 610 to 2572 with a median of 1653.
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.