Start Your Engines

[syzygy]

im now able to confirm Louis's statement that the original position is NOT a mate in 27 but a mate in 26 moves or less !!...thank you Louis for making such an incredible deep analysis !..in my eyes youre the only one who deserves points (if any, probably not ) for the task that was made...u inspired me to dig deeper and u were simply right..full credits to your amazing analysis !

regards, Peer

Thanks, but I really did very little. Credit should mostly go to Cfish and Intel.

Let's give the credit to Stockfish then

[zullil]

im now able to confirm Louis's statement that the original position is NOT a mate in 27 but a mate in 26 moves or less !!...thank you Louis for making such an incredible deep analysis !..in my eyes youre the only one who deserves points (if any, probably not ) for the task that was made...u inspired me to dig deeper and u were simply right..full credits to your amazing analysis !

regards, Peer

Thanks, but I really did very little. Credit should mostly go to Cfish and Intel.

Let's give the credit to Stockfish then

Of course, but I was fearful of having to recurse back to the Big Bang.

[Rebel]

So no one got it right, maybe the best outcome.

[Ovyron]

Okay, so after spending a good deal of time trying to pinpoint the exact shortest way to mate in Position 2 I realized that this isn't my thing

*smacks forehead*

I just assumed everyone was going to get it right, I find incredible that if I kept going I'd have found +M26 and would have been the only one with a correct answer. Guess that completely shreds my "no skill required" part, huh?

Though, I guess this isn't different from resigning winning positions...

[Rebel]

Week-6 is up, not that hard I estimate.

Slowly running out of suitable positions, top engines are so good....

[MikeB]

Week-6 is up, not that hard I estimate.

Slowly running out of suitable positions, top engines are so good....

Hi Ed,


Just FYI , since I see you posted the solutions, on the third position. all 11 legal moves come back with a mate score:
[d]1k3b1q/pP2p1p1/P1K1P1Pp/7P/2B5/8/8/8 w - - 0 1

Code: Select all

 62	  #27 	1.23G	0:33.41	Bb5 Qg8 Kd5 Kc7 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf4+ Kg6 Qcf7# 
 62	  #27 	1.23G	0:33.41	Kd5 Kc7 Bb5 Qg8 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf4+ Kg6 Qcf7# 
 62	  #29 	6.98G	3:10.84	Kb5 Kc7 Kc5 Qg8 Kd5 Qh8 Bb5 Qg8 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #29 	1.33G	0:36.15	Ba2 Qg8 Kd5 Kc7 Bc4 Qh8 Bb5 Qg8 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #29 	1.33G	0:36.14	Bb3 Qg8 Kd5 Kc7 Bc4 Qh8 Bb5 Qg8 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #29 	1.33G	0:36.12	Bd3 Qg8 Kd5 Qh8 Bb5 Kc7 Be8 Qg8 Bf7 Qh8 Kc5 Kb8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #29 	1.33G	0:36.11	Bf1 Qg8 Kd5 Kc7 Bc4 Qh8 Bb5 Qg8 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #29 	1.23G	0:33.49	Kd7 Qg8 Bb5 Qh8 Kc6 Qg8 Kd5 Kc7 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #29 	1.23G	0:33.48	Kc5 Kc7 Bd3 Kb8 Bb5 Qg8 Kd5 Kc7 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #29 	1.23G	0:33.47	Be2 Qg8 Kd5 Kc7 Bc4 Qh8 Bb5 Qg8 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q Ke4 Qc4+ Kf5 Qhf 
 62	  #31 	6.98G	3:10.88	Bd5 Qg8 Kd7 Qh8 Bc6 Qg8 Bb5 Qh8 Kc6 Qg8 Kd5 Kc7 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc7 Qg8 Kc8 Qxf7 gxf7 g5 hxg6 h5 Kd8 Kb8 Ke8 Bg7 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 e7 h3 e8=Q h2 Qe5+ Kc6 Qxh2 Kd5 g7 Kd4 g8=Q

and your submitted solution is flawed!

Code: Select all

1. Kd5 {1. Bb5 Qg8 2.Bb5} Qg8 2. Bb5 Kc7 3. Be8 Qh8 4. Bf7 Kb8 5. Kc6 Qg8 6. Kd7 Qh8 7. Ke8 Kc7 8. b8=Q+ Kxb8 9. Kd8 Ka8 10. Kc8 Qg8 11. Kc7 Qxf7 12. gxf7 g5 13. Kd8 g4 14. Ke8 Bg7 15. Kxe7 g3 16. f8=Q+ Bxf8+ 17. Kxf8 g2 18. e7 g1=Q 19. e8=Q# 1-0

after 18. e7, black should play Kb8? extending the mate 8 more moves, hence both Bb5 and Kd7 both lead to mate in 27 - I should get credit for the correct answer and I believe a bonus point for pointing our the error in the line presented!

Code: Select all

dep	score	nodes	time	(not shown:  tbhits	knps	seldep)
 61	  #27 	350.3M	0:08.93	Kd5 Kc7 Bb5 Qg8 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc8 Qg8 Kc7 Qxf7 gxf7 g5 hxg6 h5 Kd7 Kb8 Ke8 Bh6 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 g7 h3 g8=Q h2 Qg3+ Kb6 Qxh2 Kxa6 e7 Ka5 Qd2+ Ka6 e8=Q Kb7 Qb4+ Kc7 Qbb8# 
 61	  #27 	347.9M	0:08.86	Bb5 Qg8 Kd5 Kc7 Be8 Kb8 Bf7 Qh8 Kc6 Qg8 Kd7 Qh8 Ke8 Kc7 b8=Q+ Kxb8 Kd7 Ka8 Kc8 Qg8 Kc7 Qxf7 gxf7 g5 hxg6 h5 Kd7 Kb8 Ke8 Bh6 Kxe7 Kc7 f8=Q Bxf8+ Kxf8 h4 g7 h3 g8=Q h2 Qg3+ Kb6 Qxh2 Kxa6 e7 Ka5 Qd2+ Ka6 e8=Q Kb7 Qb4+ Kc7 Qbb8# 

[Rebel]

and your submitted solution is flawed!

If this were a mate in x inquiry then you are right, but it isn't. It's about the best move of a composition (study) and there are only 2 good moves (Kd5 and Bb5) that lead to the theme of the componist, to get the white bishop on f7 via e8.

As in the Kubbel composition (if it had not been a mate in x inquiry) no one (and the componist in particular) is interested in the silly 1...Kb7 after 1.Rc8+ and in this study the point of the composer is that black just is one tempo short to draw. Moves like 18...Kb8 19. e8Q+ Kc7 20.Qg6 with loss of the pawn are irrelevant to the theme of the study.

[Dann Corbit]

As you know, Ed. The dog ate my homework.
BTW, I have literally tens of thousands of positions that are nearly insoluble.
If you want to turn the planet's PCs int smoking piles of junk, just let me know.

[Rebel]

As you know, Ed. The dog ate my homework.
BTW, I have literally tens of thousands of positions that are nearly insoluble.
If you want to turn the planet's PCs int smoking piles of junk, just let me know.

I am delighted!

[arunsoorya1309]

Dann dont reply when you are drunk probably