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I am in the dark about the following endgame, with white to move. May someone with FinalGen (or a powerful engine) give me a response? Is it a White win or a draw?

[FEN "8/1k6/5R2/P7/1KP4p/5P2/8/5r2 w - - 0 1"]
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  • Not sure this is such a useful question on a question/answer site like this. Why not just check yourself with Finalgen?
    – koedem
    Jan 19 at 3:03
  • Unfortunately I do not have this instrument
    – Stefano
    Jan 19 at 9:02
  • For what its worth, my Rybka checks, and then trades pawns, calling it 2.78 at about 33 depth.. which is pretty winnish, right? I dunno. I can't remember but I think I don't have the endgame tablebases installed, and I bet it would just know immediately if I did. Jan 19 at 10:06
  • I guess I should specify, Rybka checks with Bc6... here: 1. Rb6+ Ka7 2. Rh6 Rxf3 3. Rxh4 Rf1 4. c5 Kb7 5. Kb5 Rb1+ 6. Rb4 Rg1 7. a6+ Ka7 ... still calling it 2.78 pawns ahead, at 34 depth Jan 19 at 10:09
  • I think White has no better than trade f against h immediately (otherwise, Black gets the P for nothing, also a draw by Syzygy), and the resulting endgame a+c is usually draw. Thus it is easy to assign Justin's variant even with Nalimov: 3...Rf1? loses, only draw 3...Kb7. Jan 19 at 10:18
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No need for engine analysis, that's a win for White since that parciular a+c pawn endgame is won. White can simply trade the other two pawns with Rh6

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    That's not true, Rh6 Rxf3 Rxh4 is a well known theoretical draw. Black defends this kind of position by putting the king on the short side (i.e. a file in this case) and then checks with the rook whenever the white king steps out from the c pawns cover.
    – koedem
    Jan 19 at 10:46
  • @koedem Although the position after that line is a draw, Black must play exact. If Black took your advice literally and played Ka6, Ka7, or Ka8 the next move, White would have a forced win, according to the lichess tablebase.
    – D M
    Jan 19 at 11:44
  • @DM yes, this was not a suggestion for specific moves, it is the general idea of how to hold this endgame. It is in fact quite difficult to defend / easy to screw up as a human.
    – koedem
    Jan 19 at 12:56

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