The longest checkmate question

Hobacle · Post by **Hobacle** » Mon Jan 31, 2022 9:21 am

Which position known has the longest checkmate under the 50-move rule?

yeni_sekme · Post by **yeni_sekme** » Mon Jan 31, 2022 9:30 am

I have seen some +200 moves chess puzzles but I don't know the longest one

Vinvin · Post by **Vinvin** » Mon Jan 31, 2022 10:05 am

Hobacle wrote: ↑Mon Jan 31, 2022 9:21 am Which position known has the longest checkmate under the 50-move rule?

Thread about longest checkmate here : forum3/viewtopic.php?p=474372#p474372

xr_a_y · Post by **xr_a_y** » Mon Jan 31, 2022 10:14 am

Hobacle wrote: ↑Mon Jan 31, 2022 9:21 am Which position known has the longest checkmate under the 50-move rule?

The longest checkmate "under the 50move rule" is probably exactly in 50 moves no ?
You can probably explore things from here : https://syzygy-tables.info/endgames

RubiChess · Post by **RubiChess** » Mon Jan 31, 2022 12:17 pm

xr_a_y wrote: ↑Mon Jan 31, 2022 10:14 am
Hobacle wrote: ↑Mon Jan 31, 2022 9:21 am Which position known has the longest checkmate under the 50-move rule?
The longest checkmate "under the 50move rule" is probably exactly in 50 moves no ?

The path to checkmate can easily be longer than 50 moves, just needs to reset the 50 moves counter in time.

Ozymandias · Post by **Ozymandias** » Mon Jan 31, 2022 12:29 pm

Depends on the rules. For example, longest Nalimov was:

[fen]6k1/5n2/8/8/8/5n2/1RK5/1N6 w - - 0 1[/fen]

Win in 262 (as shown here).
But the same position, gives you a cursed win with DTZ 484 here. Take your pick.

Jouni · Post by **Jouni** » Mon Jan 31, 2022 2:01 pm

Surprisingly 8 piece tablebases have not improved record so far!

Sopel · Post by **Sopel** » Mon Jan 31, 2022 2:22 pm

Ozymandias wrote: ↑Mon Jan 31, 2022 12:29 pm Depends on the rules. For example, longest Nalimov was:

[fen]6k1/5n2/8/8/8/5n2/1RK5/1N6 w - - 0 1[/fen]

Win in 262 (as shown here).
But the same position, gives you a cursed win with DTZ 484 here. Take your pick.

both are correct, it's a cursed win, i.e. irrelevant to the topic

Ajedrecista · Post by **Ajedrecista** » Mon Jan 31, 2022 8:47 pm

Hello:

Jouni wrote: ↑Mon Jan 31, 2022 2:01 pm Surprisingly 8 piece tablebases have not improved record so far!

Someone of this forum posted two articles of 8-man EGTB but I do not remember who and where. Nevertheless, I found them on the Internet:

https://www.arves.org/arves/index.php/e ... plorations

https://www.arves.org/arves/index.php/e ... n-endgames

The second link contains a position with a win in 584 moves. Is it relevant to the topic or not (cursed wins, 50-move rule and so on)? Anyway, have fun!

Regards from Spain.

Ajedrecista.

Jouni · Post by **Jouni** » Mon Jan 31, 2022 10:15 pm

Thanks for link, we have now a new record!

The longest checkmate question

The longest checkmate question

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