TL;DR Is there a chess engine or other tools to study a "position" where the exact location of certain pieces is not known?

From the following chess position, a plan could be to win the a2 pawn in three moves with either a skewer or a fork in the seventh rank, and then win the QPPPK v QK endgame.

[Title ""]
[FEN "8/5pk1/4p2p/2Q5/8/6q1/P7/6K1 w - - 0 42"]
[StartFlipped "1"]

1. Kf1 (1. Kh1 Qe1+ {fork next}) Qf3+ 2. Ke1 (2. Kg1 Qd1+ {fork next}) Qh1+ {skewer next}

However, then white will be on the move, and we have to analyze whether there is or not a perpetual. The diagram below represents the 12 different positions we will have to analyze.

[Title ""]
[FEN "8/5pk1/4p2p/2Q5/8/2KKKKKK/q7/2KKKKKK w - - 0 44"]
[StartFlipped "1"]

Of course, since the 12 positions are similar, their analysis will overlap with each other. Therefore, it would be ideal to begin with a singular analysis, and only bifurcate it into multiple cases when the white king's position starts to matter.

I usually do such a study manually using the board editor of Lichess, while the variations are shallow enough for me to keep track with arrows. Then I switch to a Lichess Study at the expense of having to create multiple chapters, one for each remaining possibility.

Are better known ways to do this kind of in-depth analysis?

  • Off-topic: The positions presented here could appear in today's Carlsen game against Pantsulaia after 37... Qe2+.
    – FxMySz
    Commented Aug 2, 2023 at 16:36
  • 1
    With too many time on my hands I would hotwire a generic tablebase and insert special "breakoff" conditions. (Q exchange being one) In this special case, you can run the 12 subpositions through Syzygy. Black always wins. Commented Aug 3, 2023 at 7:12


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.