Puzzle zvr9n_M — ELO 2667
This is a White-to-move puzzle rated 2667 ELO. The first move is g1g5, tagged with 10 interpretable concepts and Lichess themes: crushing, endgame, exposedKing.
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Position
White to move. ELO 2667. Themes: crushing, endgame, exposedKing, fork, veryLong.
FEN: 8/6p1/Np6/p4n1p/2k4P/2Ppp3/PP6/4K1R1 w - - 0 40
Show solution (8 ply)
Try to find the move yourself first — look for the rarest concept firing on this position before peeking. Solution sequence: g1g5 f5h4 g5g3 c4d5 g3e3 h4g2 e1d2 g2e3
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 knight or bishop on the back rank (1st or 8th) that is not attacked by the…, which appears in only 16 of our 9,950 puzzles (0.16%). 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 2667 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?
2667 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 g1g5.
What concepts does it train?
10 SAE-derived patterns including Active king in a king-and-pawn endgame, often on the…; King actively centralised in a late endgame (pawn or minor…; Active knight participating in a mating attack, often with….
Can I attempt it without an account?
Yes — Climbchess requires no signup or email. Click the trainer link to play the position interactively.