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  • $\begingroup$ In terms of that 524-step one, I'm assuming 1. Qxb7 is not the optimal move? $\endgroup$
    – user88
    Commented Jun 2, 2014 at 21:52
  • $\begingroup$ @JoeZ. It is not, but I couldn't tell you why offhand. (That thread also contains a position with a longer sequence, which I should update this answer to at some point.) $\endgroup$
    – Steven Stadnicki
    Commented Jun 3, 2014 at 6:53
  • 4
    $\begingroup$ @JoeZ The first diagram has a little black square in the top right corner. This indicates that it's Black's move. Even though chess problem genres have conventions as to who moves first, people reporting positions in chess tablebases may give a WTM or a BTM position. $\endgroup$
    – Rosie F
    Commented Aug 6, 2016 at 19:47
  • 3
    $\begingroup$ Petrovic's #270 above is in Fox & James's The Complete Chess Addict, which gives some of the moves. As Steve says, Black, when out of pawn-moves, must allow White Ka6. White threatens Ka6 only when wK is on a5. The point of 1 Bb1 is that wK is on a5 now, so Black must push a pawn now. $\endgroup$
    – Rosie F
    Commented Aug 6, 2016 at 20:17
  • $\begingroup$ if the fifty move rule is applied a player can claim a draw after at most ~300 moves. this applies to all seven piece endgames. $\endgroup$
    – miracle173
    Commented Mar 14, 2018 at 5:29