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MatPlus.Net Forum General Consecutive checks, but Black's hand is forced
 
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(1) Posted by Rewan Demontay (Real Name: James Malcom) [Wednesday, Feb 10, 2021 03:44]

Consecutive checks, but Black's hand is forced


The task of consecutive checks is old and done. Let's try something fresh!

My idea is that Black is forced to check while White extends the checking sequence for as long as possible. In my view, dual move orders by White should be heavily avoided. I'm open to suggestions on how to stipulate this.

Without promoted pieces, 21 checks is my longest attempt so far.

(= 12+14 )

1. fxe5+ fxe5+ 2. Rxe5+ c5+ 3. Rxc5+ e5+ 4. Rxe5+ c5+ 5. Rxc5+ e5+ 6. Rxe5+ Qc5+ 7. Qxc5+ bxc5+ 8. Rxc5+ Ke7+ 9. Nd5+ Rxd5+ 10. exd5+ Ne6+ 11. Rxe6+

Who can do longer? With promoted pieces and only discovered checks are also welcome.

Here is a previous attempt at 20 to fuel possiblites.

(= 11+11 )


And an 18.

(= 13+10 )

 
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(2) Posted by Rewan Demontay (Real Name: James Malcom) [Wednesday, Feb 10, 2021 17:19]

With a small dual order, 22 is done.

White moves and forces 22 consecutive checks
(= 13+12 )


1. e5+ fxe5+ 2. fxe5+ Bxe5+ 3. Rxe5+ c5+ 4. Rexc5+ e5+ 5. Rxe5+ c5+ 6. Rexc5+ e5+ 7. Rxe5+ Qc5+ 8. Qxc5+ bxc5+ 9. Rexc5+ Ke7+ 10. Ncd5+,Necd5+ Rxd5+ 11. Nxd5+ Rxd5+

For the record, this general scheme comes from https://pdb.dieschwalbe.de/P1386256 and https://pdb.dieschwalbe.de/P1386257.

EDIT: Here is a jab at with promoted pieces.

White moves and forces 26 consecutive checks
(= 14+12 )

1. fxe5+ Qxe5+ 2. Rxe5+ c5+ 3. Rexc5+ e5+ 4. Rxe5+ c5+ 5. Rexc5+ e5+ 6. Rxe5+ Qc5+ 7. Rexc5+ Ke7+ 8. Ncd5+ Rxd5+ 9. Nxd5+ Rxd5+ 10. Rxd5+ Rd6+ 11. Rg7+ Bxg7+ 12. f6+ Bxf6+ 13. Qe5+ Bxe5+
 
 
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(3) Posted by Rewan Demontay (Real Name: James Malcom) [Friday, Jul 30, 2021 04:11]

Over the past few dayss, I have been playing around some ideas and promoted pieces. 22 without promoted pieces is still set in stone. With promoted pieces, however, is a different story. One major flaws in the 26 is the fact that fxe5 is in fact completely unnecessary, as it can simply come from e4 instead. The piece count for this new record is the same, and yet it is far more using of its material than the 26. Overall, it is a major improvement. The only flaw is the still minor swap in knight moves.

White moves and forces 30 consecutive checks
(= 13+14 )

1. Rxe5+ c5+ 2. Rxc5+ e5+ 3. Rxe5+ c5+ 4. Rxc5+ e5+ 5. Rxe5+ Qc5+ 6. Qxc5+ bxc5+ 7. Rxc5+ Ke7+ 8. Ncd5+/Nexd5+ Rxd5+ 9. Nxd5+ Rxd5+ 10. Rxd5+ Rd6+ 11. Rg7+ Qxg7+ 12. f6+ Qxf6+ 13. gxf6+ Bxf6+ 14. Qe5+ Bxe5+ 15. Qxe5+ Qxe5+

I myself had severe doubt of its legality at fist. But thanks to a little help from Siegfried Hornecker, I proved it as such. Here is a non-quite optimal proof game to go with it.
1. g4 b6 2. c4 Bb7 3. c5 Be4 4. c6 h5 5. g5 Bh7 6. g6 dxc6 7. gxh7 g5 8. h4 g4 9. e4 Nf6 10. e5 Ne4 11. e6 fxe6 12. Rh3 Kd7 13. Rf3 Kd6 14. Rf6 Bh6 15. d4 a5 16. Ke2 a4 17. Nc3 a3 18. d5 axb2 19. a4 Kc5 20. d6 Nd7 21. a5 Ne5 22. d7 Qc8 23. d8=Q Qb7 24. Q8d2 Rhd8 25. h8=Q b1=Q 26. a6 Bf4 27. a7 Ng5 28. hxg5 Bg3 29. f4 Qh7 30. f5 h4 31. Nf3 h3 32. Ke3 h2 33. Ne1 h1=R 34. Qf3 Rh6 35. Nc2 Rd7 36. Qh2 Rad8 37. a8=Q Kd6 38. Kd4 Bh4 39. Ra5 Qc8 40. Rc5 Rg6 41. Qa4 Rg7 42. Qg8 Qh8 43. Bb5 Rf7 44. Rg6 Rf6 45. Ba3 g3 46. Ne3 g2 47. Qff4 g1=Q 48. Qc4 Qf1 49. Bb4 Qe2
 
 
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MatPlus.Net Forum General Consecutive checks, but Black's hand is forced