Black has a decisive tactical threat — advanced pawn, fork, or promotion — with White unable to mount sufficient defence.
SAE concept sae_33325 fires when black has a decisive tactical threat — advanced pawn, fork, or promotion — with White unable to mount sufficient defence.. It appears in 20 of 9,950 Climbchess puzzles (0.2%), spanning ELO 792–2480 (median 1614).
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This page documents Black has a decisive tactical threat — advanced…, 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:
Black has a decisive tactical threat — advanced pawn, fork, or promotion — with White unable to mount sufficient defence.
This pattern fires in 20 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 792 to 2480, with a median rating of 1614. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_33325 |
|---|---|
| Puzzles where it fires | 20 |
| Min ELO | 792 |
| Median ELO | 1614 |
| Max ELO | 2480 |
| Coverage | 0.20% 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 ze6cC — ELO 792, themes: advancedPawn, endgame, mate, side to move: White
- Puzzle ze6cC_M — ELO 792, themes: advancedPawn, endgame, mate, side to move: White
- Puzzle zzo7m_F — ELO 808, themes: advantage, endgame, fork, side to move: White
- Puzzle xTK3V — ELO 1498, themes: anastasiaMate, fork, mate, side to move: Black
- Puzzle zniQF — ELO 1614, themes: advancedPawn, advantage, clearance, side to move: White
- Puzzle zniQF_M — ELO 1614, themes: advancedPawn, advantage, clearance, side to move: White
- Puzzle zxkgd_F — ELO 2085, themes: advancedPawn, crushing, defensiveMove, side to move: Black
- Puzzle zzAqy_F — ELO 2286, themes: endgame, exposedKing, long, side to move: White
- Puzzle m4axR_M — ELO 2364, themes: arabianMate, attraction, kingsideAttack, side to move: Black
- Puzzle NqvFO_F — ELO 2480, themes: arabianMate, endgame, exposedKing, side to move: Black
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_33325?
Black has a decisive tactical threat — advanced pawn, fork, or promotion — with White unable to mount sufficient defence. 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 20 tagged puzzles (0.2% of the set), spanning Lichess ELO 792 to 2480 with a median of 1614.
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.