RdC wrote on 06/02/19 at 22:32:06:


I'm not actually sure about that specific site. Usually they're regarded as valid "research material". If I remember correctly, in ICCF rules you can even claim a win if the 6-piece tablebases say it's won; and doubtless they'll update that to 7-piece tablebases at some point. Generally, I like to know why I'm winning though.

Position after 48 Rxh4


Müller & Lamprecht (2001): “If the pawn is on its original square or if it is a knight's pawn the position is drawn, as long as the attacking king is cut off and can't get behind the pawn.”

Grivas (2008): “(...) provided that the defending king and rook are close to the pawn and that the opponent's king cannot attack from behind. The basic rules are: 1. (...) 2. With a b- or g-pawn, it's always a draw. 3. (...)”

And yet the endgame is a win for Black. The reason is that the king can get behind the pawn, even though it doesn't look likely right now.

I've blogged about this here:
https://200opengames.blogspot.com/2019/06/049-queen-vs-rook-and-pawn.html