the library · reviewed 2026-09-14

Bournel – Pranav

42nd Cappelle Open 2026 · 2026.02.25 · Elo 2433/2606 · interesting · ★★★

The daily position for Wednesday 9 September 2026. It is still open to solve — the grader reads your whole line, sidelines and evaluation included, before anything here is shown. Cover the solution and solve it first →

Black to move. the model predicts 43% at this level.

The solution

42…♖︎c6! (not 42…♘︎f6? 43.♗︎d5 ♖︎b8 44.♗︎f3 ♖︎b3 45.♘︎d1 ⩱) 43.♘︎e4 (if 43.♗︎e2 then 43…♖︎xc3 44.♗︎xh5 ♖︎xe3+ −+) 43…♖︎xc4 44.♘︎d6 (44.♔︎h4 is as good: 44…♔︎g6 45.♘︎d2 ♖︎c3 −+) 44…♖︎c6 45.♘︎f5+ ♔︎h7 (not 45…♔︎g6? 46.♘︎e7+ ♔︎g5 47.♘︎xc6 =) 46.♔︎g4 ♘︎f6+ −+

42…♖︎c6 — most players miss this
43…♖︎xc4 — the standard move
44…♖︎c6 — almost nobody finds this · worth +1
45…♔︎h7 — most players miss this · worth +1
46…♘︎f6+ — the natural move

“hard to find”, “the natural move” and the rest describe how often this move is played by Maia-2, weighted across the 1500/1900/2000 audience the difficulty model is fitted on — a model of human play, not a count of anyone who solved this position.

Members can take this away as a PGN — the diagram, the verified line and their own analysis in one file, for a database, Anki or Chessable.

What happened at the board

Pranav found it · 0-1

the game went on 43.♗︎e2 ♖︎xc3 44.♗︎xh5 ♖︎xe3+ 45.♔︎g4 ♖︎e4+ 46.♔︎g3 ♖︎xd4 47.♗︎g4 ♔︎g6 48.♗︎c8 ♔︎g5… on to move 64 · 0-1full game ↗

The field

100% of the 31 committed lines here found the key move — the model predicted 43% at this level.

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