A rook poised to deliver or support a back-rank mate, often on an open file aligned near the enemy king.
SAE concept sae_23764 fires when a rook poised to deliver or support a back-rank mate, often on an open file aligned near the enemy king.. It appears in 106 of 9,950 Climbchess puzzles (1.1%), spanning ELO 613–2315 (median 907).
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This page documents A rook poised to deliver or support a back-rank…, 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:
A rook poised to deliver or support a back-rank mate, often on an open file aligned near the enemy king.
This pattern fires in 106 of our 9,950 tagged puzzles. The puzzles where it appears span ELO 613 to 2315, with a median rating of 907. That distribution tells you whether this is a beginner cue or a master-level subtlety.
Pattern statistics
| Concept ID | sae_23764 |
|---|---|
| Puzzles where it fires | 106 |
| Min ELO | 613 |
| Median ELO | 907 |
| Max ELO | 2315 |
| Coverage | 1.07% 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 xbPL4 — ELO 613, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle zv890_M — ELO 687, themes: backRankMate, endgame, mate, side to move: White
- Puzzle 01xyJ_F — ELO 802, themes: endgame, mate, mateIn2, side to move: White
- Puzzle 01OgB_M — ELO 839, themes: endgame, mate, mateIn2, side to move: White
- Puzzle zimOe — ELO 875, themes: crushing, deflection, endgame, side to move: White
- Puzzle zBfkt — ELO 907, themes: anastasiaMate, endgame, mate, side to move: White
- Puzzle 00Yfr — ELO 985, themes: endgame, mate, mateIn2, side to move: Black
- Puzzle 015fL — ELO 1206, themes: endgame, mate, mateIn2, side to move: White
- Puzzle yo39T — ELO 1571, themes: endgame, hookMate, mate, side to move: Black
- Puzzle zzmYF_M — ELO 1997, themes: advantage, deflection, 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_23764?
A rook poised to deliver or support a back-rank mate, often on an open file aligned near the enemy king. 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 106 tagged puzzles (1.1% of the set), spanning Lichess ELO 613 to 2315 with a median of 907.
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.