Puzzle Tscu2_F — ELO 1936
This is a Black-to-move puzzle rated 1936 ELO. The first move is d5f6, tagged with 10 interpretable concepts and Lichess themes: kingsideAttack, long, mate.
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Position
Black to move. ELO 1936. Themes: kingsideAttack, long, mate, mateIn3, opening, sacrifice, smotheredMate.
FEN: rnbqr1k1/ppp2ppp/8/b2np1NQ/2B1P3/P7/1PPP1PPP/R1B1K2R b KQ - 1 9
Show solution (6 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: d5f6 h5f7 g8h8 f7g8 f6g8 g5f7
Concepts that fire on this position
Our SAE pipeline tagged this position with 10 active features. Each links to a page documenting that pattern in detail.
Why this puzzle is hard
The rarest pattern firing here is White King on e1 or g1, defended by multiple own pieces and not attacked by…, which appears in only 97 of our 9,950 puzzles (0.97%). Rare patterns tend to be the bottleneck — players who haven't internalised them will fail this puzzle even when their tactical calculation is otherwise solid.
The puzzle's Lichess ELO of 1936 reflects this: solvers below that rating typically miss the cue entirely.
Similar puzzles
Puzzles sharing the most concept tags with this one — a stronger signal than theme overlap because it reflects the actual patterns Leela recognises.
Train this pattern
Click through to the Climbchess trainer to attempt the position interactively against the same Leela network that tagged it. The trainer adapts difficulty using your live concept-recognition profile — it surfaces puzzles tagged with concepts you've been missing, not random brawls.
If you want the underlying methodology, the how-it-works page walks through the SAE training run, the labelling pipeline, and the puzzle-tagging procedure end-to-end.
Frequently asked
What is the rating of this puzzle?
1936 Lichess ELO. Solvers below that rating typically miss the key cue.
Which side moves first?
Black to move; the first move of the solution is d5f6.
What concepts does it train?
10 SAE-derived patterns including White Queen on the 1st or 2nd rank, unthreatened by black…; Detects an undeveloped or passively placed black bishop…; A black queen on a central or open file, not attacked by….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.