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What is the maximum DTC and the maximum DTZ in the endgame KRPKRP (rook+pawn against rook+pawn) ?

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  • Please also show some position.
    – Peter
    Mar 31 '15 at 0:16
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According to longest checkmates in chess, the longest DTM (depth-to-mate) for KRP vs KRP is 112 moves, starting from this position with white to move:

[FEN "8/7P/1K5R/8/1r1k4/8/4p3/8 w - - 0 1"]

The analysis ignores the 50 move rule.

Additionally, according to the Syzygy tablebases., the maximum KRP-KRP DTZ is 122 ply.

[Title "DTZ 122 Ply"]
[FEN "8/8/8/1P3p2/8/8/2R2r2/k1K5 b - - 0 1"]
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  • I already knew this collection of positions with the longest distance to mate. But I am looking for positions with longest distance to conversion or distance to zero. This example quickly turns into a queen+rook against queen+rook - battle, also interesting, but not what I am actually looking for.
    – Peter
    Aug 22 '17 at 15:35
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    @Peter: In hindsight I think it would have been beneficial if you had included your own research into the question, i.e. that you knew about the DTM analysis. Given that you asked the question 2+ years ago, it would be great if you could post an answer/updated question with the research you have conducted since then.
    – user1108
    Aug 23 '17 at 10:09

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