Puzzle qmPYE_F — ELO 1811
This is a White-to-move puzzle rated 1811 ELO. The first move is h1h2, tagged with 10 interpretable concepts and Lichess themes: endgame, hookMate, mate.
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Position
White to move. ELO 1811. Themes: endgame, hookMate, mate, mateIn5, veryLong.
FEN: k7/2r5/PRP5/8/3Bp1p1/4P1P1/5P1p/4n2K w - - 1 46
Show solution (10 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: h1h2 c7h7 h2g1 e1f3 g1g2 h7h2 g2f1 h2h1 f1e2 h1e1
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 A square is attacked by at least 3 white pieces and at most 1 black piece, and…, which appears in only 42 of our 9,950 puzzles (0.42%). 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 1811 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?
1811 Lichess ELO. Solvers below that rating typically miss the key cue.
Which side moves first?
White to move; the first move of the solution is h1h2.
What concepts does it train?
10 SAE-derived patterns including Detects white king safely castled on the back rank…; A black bishop that is active or under pressure in a…; Detects a piece (king, knight, or bishop) on a corner….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.