# Chess Problem: Reset The 50-Move Rule!

While chess problems and such are usually meant for Puzzling Stack Exchange, I thought that this one should be an exception since it’s more relevant IMHO.

Resetting the 50-move rule, i.e. restart the 100 ply cycle, requires either a pawn push or a capture. Checkmate does not restart it of course.

``````[Title "Geir Sune Tallaksen Østmoe, MatPlus.net Forum 8/14/2013, White To Move"]
[FEN "1K6/2p5/p5pr/q2k3n/P1pPp1rP/1pP1PpPR/1P3P1B/3N3N w - - 0 1"]
``````

Given that White is playing to reset the 50-move rule and Black is trying to avoid it, how many moves will it take to for White to reset the 50-move rule? Or, in layman’s terms, after how many moves can White make a capture or a pawn moves while Black avoids doing or allowing that to happen?

• Do I understand correctly that the question is: after how many moves can white force black to capture? Commented Apr 7, 2020 at 17:08
• Ok, so there are two factors that make this problem possible to solve I guess. First, after 1. Kc8, black can only move the h6 rook to avoid resetting the counter. Secondly, white can free the rook through the maneouvre Bg1-Rh2-Rg2-Bh2-Rg1-Re1-Re2-Rc2-Rc1-Ra1-Ra3, threatening Rxb3 resetting the counter. Left is to calculate for how long black can give checks with the rook, and thus delaying the rook maneouvre. I'm too lazy to do such things myself though. Commented Apr 8, 2020 at 2:22
• @Scounged: I am also too lazy, but the problem might be slightly more interesting (and harder to count), because also the Nh5 can check in some lines. For instance if the white king runs straight towards the right, you can have a setup with Rh7 and the knight checking from f6 and d7 while the white king shuffles between g8 and f8. Of course this perpetual can be broken by e.g. moving the king to d8. Just wanted to say that it is more work than just checking with the rook from the sides. Commented Apr 8, 2020 at 8:07
• @Scounged: furthermore, if you can move the knight with check, you also have the option of transferring the knight to another square, while the black rook blocks the pawn from h5. Commented Apr 8, 2020 at 8:09
• Who says that chess problems are usually meant for Puzzling Stack Exchange? I'm sure they are totally on topic here in good old chess.stackexchange.com Commented Apr 25, 2020 at 18:24

``````[Title "Geir Sune Tallaksen Østmoe, MatPlus.net Forum 8/14/2013, White To Move"]