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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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MatPlus.Net Forum General Consecutive checks, but Black's hand is forced