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MatPlus.Net Forum Promenade The Most Economical "Pure" Double Excelsior Combinations In The Helpmate
 
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(1) Posted by James Malcom [Saturday, Jan 14, 2023 13:29]

The Most Economical "Pure" Double Excelsior Combinations In The Helpmate


A list I personally compiled some time ago. They are "pure" in that Black starts, both excelsiors are simultaneous, start with double steps, and they are not interrupted. Economy comes in both time and piece count.

q+Q: https://www.yacpdb.org/#103418
q+R: https://pdb.dieschwalbe.de/P0559380
q+B: No White double step https://pdb.dieschwalbe.de/P0559453
q+N: https://www.yacpdb.org/#387434
r+Q: https://pdb.dieschwalbe.de/P0542418
r+R:https://www.yacpdb.org/#91038
r+B: https://pdb.dieschwalbe.de/P0559456
r+N: https://pdb.dieschwalbe.de/P1280366
b+Q: https://pdb.dieschwalbe.de/P0542448, h#5: https://pdb.dieschwalbe.de/P0521659
b+R: https://pdb.dieschwalbe.de/P0504932
b+B: https://pdb.dieschwalbe.de/P1074941, h#5.5 https://pdb.dieschwalbe.de/P1072511 & https://pdb.dieschwalbe.de/P1074941
b+N: https://pdb.dieschwalbe.de/P0504932, h#5.5 https://pdb.dieschwalbe.de/P1199280
n+Q: https://pdb.dieschwalbe.de/P0505032, h#5: https://pdb.dieschwalbe.de/P0577469
n+R: No Black double step https://pdb.dieschwalbe.de/P0559449
n+B: https://pdb.dieschwalbe.de/P0559507
n+N: https://pdb.dieschwalbe.de/P1280367, h#5: https://pdb.dieschwalbe.de/P1077165, h#7: https://pdb.dieschwalbe.de/P0559558 & https://pdb.dieschwalbe.de/P0559559
 
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(2) Posted by Frank Richter [Saturday, Jan 14, 2023 13:52]

Thank you for compilation.
For b+Q h#5 correct link: https://pdb.dieschwalbe.de/P0521659
 
 
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(3) Posted by James Malcom [Saturday, Jan 14, 2023 14:10]

Fixed, thanks.
 
   
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(4) Posted by Hauke Reddmann [Saturday, Jan 14, 2023 17:51]

"s+R: No Black double step https://pdb.dieschwalbe.de/P0559449";...
what cook do Ra2 AND Ba1 stop? Ra2 OR Ba1 might work.
(My PC is far too slow for testing)
 
   
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(5) Posted by Frank Richter [Saturday, Jan 14, 2023 21:29]

With Ra2 or Ba1 only:
1.Kb4xa4 Tc7xc3 2.Ka4-b4 Tc3xb3 3.Kb4-a4 Kb1-c2 4.b2-b1S Tb3-b5 5.Sb1-c3 Tb5-c5 6.Sc3-b5 Tc5-c4# f.ex.
 
   
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(6) Posted by Frank Richter [Sunday, Jan 15, 2023 10:16]

I'm sorry James, but your example for b+B (https://pdb.dieschwalbe.de/P0504938) shows only a single Excelsior and it is s+B.
For the first double Excelsior b+B in minimum number of moves please see https://pdb.dieschwalbe.de/P1075781 resp. https://pdb.dieschwalbe.de/P1072511
 
   
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(7) Posted by Torsten Linß [Sunday, Jan 15, 2023 15:15]

Frank, P107578 is not a valid problem-ID in PDB. What's the correct one?

Torsten
 
   
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(8) Posted by Olaf Jenkner [Sunday, Jan 15, 2023 15:21]

Blank
 
 
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(9) Posted by Frank Richter [Sunday, Jan 15, 2023 15:22]

Ups ... P1075781 is the correct ID.
 
   
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(10) Posted by James Malcom [Sunday, Jan 15, 2023 19:11]

Thanks Frank, have added this in and made the corrections as needed.
 
 
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MatPlus.Net Forum Promenade The Most Economical "Pure" Double Excelsior Combinations In The Helpmate