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MatPlus.Net Forum Fairies Help needed with Locusts!
 
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(1) Posted by Administrator [Saturday, Feb 25, 2012 04:49]

Help needed with Locusts!


Can anybody teach me, and give the example(s), about the Knight-Locust and Pawn-Locust (and also the related marine pieces Squid and Prawn)??

Thank you!
 
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(2) Posted by Kevin Begley [Saturday, Feb 25, 2012 07:41]; edited by Kevin Begley [12-02-25]

>"Knight-Locust and Pawn-Locust (and also the related marine pieces Squid and Prawn)??"

The Fairy Kings article defines:
Squid: moves like a Knight and captures like a Knight-Locust.
Prawn: moves like a Pawn and captures diagonally like a Pawn-Locust.

Unfortunately, it does not define a Knight-Locust or Pawn-Locust.

My semi-educated guess is:

Knight-Locust is PROBABLY like a Knight-hopper, except it must arrive on an empty square, and it must capture the hurdle (hurdling friendly units is illegal).
Note: a Knight-hopper is like a Nightrider-hopper, except it is not a rider.

Thus, a Knight-Locust from a1 may hurdle (and capture the hurdle on) b3/c2, and arrive on empty square c5/e3.
But, unlike a Nightrider-Locust, it may not -- again, from a1 -- hurdle something on c5/e3 (even if d7/g4 are unoccupied).

A Pawn-Locust might similarly move like a Pawn-hopper, except, again, it must arrive on an empty square, and capture the hurdle.
A Pawn-hopper moves like a pawn, but both moves (only forwards) and captures (only diagonally) by hurdling.

Thus, a white Pawn-Locust from f3 PROBABLY can hurdle (without capturing the hurdle) some unit on f4, arriving onto an empty f5.
Or it might hurdle (capturing the hurdle) some unit on e4/g4, arriving onto an empty d5/h5.
Even if my guesses are correct, it is highly unclear to me whether a Pawn-Locust can legally forward hurdle (w/o capturing the hurdle) over a friendly unit.

That's my best guess... but, I find no problems using these fairy units (even by another name).
 
 
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(3) Posted by Kevin Begley [Saturday, Feb 25, 2012 08:04]; edited by Kevin Begley [12-02-25]

I was thinking these might also refer to Knight- and Pawn-units, from the marine-family, in some specific variant chess game.
And, I managed to find a possible explanation: https://chessvariants.org/~chessvar/index/msdisplay.php?itemid=MSmanandbeast12:

It covers squids and prawns (from which you can infer the meaning of the other units, based upon the definition provided in the fairy King's article).
However, be warned: this site does not exactly provide concise definitions.

According to the site:
"Snail+Shrimp=PRAWN" and "Snail+Lobster+Shrimp=SQUID"

So, what is a Snail, Lobster, and Shrimp?
I'm glad you asked that... the simplest answer I can gather (assuming the mathematical operators function normally) would be: "Snail = Trilobite - Lobster"

And, what in the deep, deep sea is a Trilobite?
Clearly, the answer is: "...an extinct marine invertebrate whose left, right, and central lobes (hence the name) fit with 3 (in 2d) forward leaps..."

Duh. Of course! Sea-Cucumber takes Abalone at Davey-Jones-3, checkmate.
 
   
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(4) Posted by Joost de Heer [Monday, Feb 27, 2012 00:42]; edited by Joost de Heer [12-02-27]

Some examples of the marine knight and the marine pawn:

Reto Aschwanden
Mark Ridley 40 jubilee
3rd HM
(= 13+6 )

#2 ( = squid (marine knight), = sirene (marine queen))
1. Sc2 [2. Rxd4#]
1...SI~ 2. f3#
1...SIf4! 2. SIf3#
1...SIf5! 2. CMxf5-g3#
1...SIf6! 2. gxf6#
1...SIf7! 2. f4#

Romeo Bedoni
diagrammes 1991
(= 3+4 )

h#3 = Poseidon (marine king), = prawn (marine pawn)
1. b3 axb3-c4 2. b1=TR c4xb5-a6 3. TRb7 a6xb7-c8=SI# (TR=Triton (marine rook))
 
   
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(5) Posted by Administrator [Monday, Feb 27, 2012 02:35]

Thanks for the help! Joost's examples helped me to search the WinChloe in different way and I found a few dozens more problems quering for 'Cavalier marin' and 'Pion marin' - should have got this idea myself, but the fact that other marine pieces are there with their 'real' names (Poséidon, Sirène, Triton, Néréïde) has misled me.

So the definitions are:
Squid: moves like a Knight and captures like a Knight-Locust
Prawn: moves like a Pawn and captures diagonally like a Pawn-Locust

Now, knowing what I should search for, I found the competent answer at Christian Poisson' site:
"Equilocusauteur(m,n) - (m,n)Equilocuhopper
Piece moving like a (m,n)Leaper until it reaches a square occupied by a unit which can be captured: the hurdle. Then, from the hurdle, without changing direction, it makes a (m,n)Leaper leap on a square which must be unoccupied. The unit on the hurdle is captured."

(http://christian.poisson.free.fr/problemesis/categories.html#Equilocusauteur)

Definitions for Knight-Locust and Pawn-Locust can be simply deduced from this.
 
 
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MatPlus.Net Forum Fairies Help needed with Locusts!