A Former Loophole-The “Legal” Triple Check
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Re: A Former Loophole-The “Legal” Triple Check
I expect a PxP ep could set up multiple checks.
I was also pondering over the previous law, white has Ke1, Ra2 and h1, Pe2, Black has Kc1, Rg8, Nh3, Bc5, so you go 0-0 mate, as the three checks didn't count.
I was also pondering over the previous law, white has Ke1, Ra2 and h1, Pe2, Black has Kc1, Rg8, Nh3, Bc5, so you go 0-0 mate, as the three checks didn't count.
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Re: A Former Loophole-The “Legal” Triple Check
A quadruple check and beyond is easily feasible. The challenge is to do it in a pleasing manner similar to how the 1988 problem demonstrates.
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Re: A Former Loophole-The “Legal” Triple Check
Can you think of examples.
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Re: A Former Loophole-The “Legal” Triple Check
Yes, I can. It’s actually not all that hard to do it, at least for me anyway. Here is a problem that I believe that is at least semi-pleasing.
Checkmate In 4 Moves
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Re: A Former Loophole-The “Legal” Triple Check
The Robert Norman letter published in CHESS that was mentioned on page 1 of this thread can be seen here:-
https://twitter.com/berlin_endgame/stat ... 55778?s=21
Bonus item: that letters page also includes correspondence from a 9 year old James Vigus
https://twitter.com/berlin_endgame/stat ... 55778?s=21
Bonus item: that letters page also includes correspondence from a 9 year old James Vigus
The Abysmal Depths of Chess: https://theabysmaldepthsofchess.blogspot.com
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Re: A Former Loophole-The “Legal” Triple Check
Many thanks for a view of the original publication Jonathan!
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Re: A Former Loophole-The “Legal” Triple Check
Triple (+++) and quadruple check (++++) exist quite legitimately in xiangqi.
The pao (cannon) is a rook, except that it must leap linearly over a piece to capture. So if it is behind e.g. a chariot (moves like a rook, captures like a rook), it can be giving check, just as the chariot in front of it is. So a check by a ma (horse) moving from in front of a chariot (a discovered check) in front of a cannon is in fact a triple check.
You can also get triple check by chariot moving to give check in front of two horses which are now both giving discovered checks.
A quadruple check by two horses, a chariot and a cannon is also possible.
The pao (cannon) is a rook, except that it must leap linearly over a piece to capture. So if it is behind e.g. a chariot (moves like a rook, captures like a rook), it can be giving check, just as the chariot in front of it is. So a check by a ma (horse) moving from in front of a chariot (a discovered check) in front of a cannon is in fact a triple check.
You can also get triple check by chariot moving to give check in front of two horses which are now both giving discovered checks.
A quadruple check by two horses, a chariot and a cannon is also possible.
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Re: A Former Loophole-The “Legal” Triple Check
I've heard that triple check is legitimate in cylindrical chess, although I can't think of a position at the moment.
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Re: A Former Loophole-The “Legal” Triple Check
No problem.Rewan Demontay wrote: ↑Fri Jun 12, 2020 7:10 pmMany thanks for a view of the original publication Jonathan!
I know you can post images directly on the forum but I don’t know how you do it from a tweet. If anybody can show me the way forward I’ll save everybody a mouse click.
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Re: A Former Loophole-The “Legal” Triple Check
I forget to mention before that there is actually a chess variant called "Bosma Chess" that was created in 1993 by R. Bosma. The Dutch problemsit also noticed the wording of the FIDE laws, so he meshed into fairy chess. In Bosma chess, a king is not in check if it is attacked three or more times. I must thank "The Chess Variant Pages" for this valueable information: https://www.chessvariants.com/problems.dir/bosma.html
An example problem is given. Try to solve it! If you can't the solution is in the linked page.
Henk Le Grand, 1st Price 151th Thematoernooi Probleemblad 1993, Mate In 2 Moves
An example problem is given. Try to solve it! If you can't the solution is in the linked page.
Henk Le Grand, 1st Price 151th Thematoernooi Probleemblad 1993, Mate In 2 Moves
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Re: A Former Loophole-The “Legal” Triple Check
An en passant capture that leads to triple check is ineed not too hard to set up as you suggested.Kevin Thurlow wrote: ↑Sat Jun 06, 2020 5:19 pmI expect a PxP ep could set up multiple checks.
I was also pondering over the previous law, white has Ke1, Ra2 and h1, Pe2, Black has Kc1, Rg8, Nh3, Bc5, so you go 0-0 mate, as the three checks didn't count.
Checkmate In 2 Moves
Also, kings cannot be next to one another since that would be putting yourself in check. However, if triple check means that you're not attacked, means you are technically able to do it.
Mate In 1
Last edited by Rewan Demontay on Sun Sep 13, 2020 4:09 am, edited 4 times in total.
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Re: A Former Loophole-The “Legal” Triple Check
I prefer that to Robert Norman's study.Rewan Demontay wrote: ↑Sat Jun 13, 2020 6:00 pmAn en passant capture that leads to triple check is ineed not too hard to set up as you suggested.
Checkmate In 2 Moves
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Re: A Former Loophole-The “Legal” Triple Check
What's so preferable about it?
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Re: A Former Loophole-The “Legal” Triple Check
It demonstrates the idea more economically.
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Re: A Former Loophole-The “Legal” Triple Check
Norman's study is more PIECE economic, but I presume you mean economic timewise? The mate in two could also be considered more economic clarity wise, since one movers are too easy to do.
Last edited by Rewan Demontay on Sun Sep 13, 2020 4:28 am, edited 1 time in total.
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