[D]1N1n4/2BPbpPb/3r1p2/2p1kP2/2p1p1P1/2p1P2K/p1P3RP/3R1N1q w - - 0 1
This position is mate in 17 with 1.Rg3 but is very hard for engines.
Can your engine find it?
Ignacio.
Mate in 17
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Vinvin
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Re: Mate in 17
Please, give the best line.
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Ignacio
- Posts: 177
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Re: Mate in 17
1. Rg3 Bg8 2. Kh4 Bh7 3. Kh5 Bg8 4. Kh6 Qf3 5. Rxf3 exf3 6. Ng3 f2 7. h3 a1=Q 8. Rxa1 Kd5 9. Rd1+ Ke5 10. h4 Bh7 11. Kxh7 f1=Q 12. Rxf1 Ne6 13. Nc6+ Kd5 14. Nxe7+ Ke5 15. d8=N Nxd8 16. Rf4 Nc6 17. Re4#Vinvin wrote:Please, give the best line.
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Vinvin
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Re: Mate in 17
I agree computers should find because there are a lot transpositions and forced moves !Ignacio wrote:1. Rg3 Bg8 2. Kh4 Bh7 3. Kh5 Bg8 4. Kh6 Qf3 5. Rxf3 exf3 6. Ng3 f2 7. h3 a1=Q 8. Rxa1 Kd5 9. Rd1+ Ke5 10. h4 Bh7 11. Kxh7 f1=Q 12. Rxf1 Ne6 13. Nc6+ Kd5 14. Nxe7+ Ke5 15. d8=N Nxd8 16. Rf4 Nc6 17. Re4#Vinvin wrote:Please, give the best line.
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Modern Times
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Re: Mate in 17
I tried Komodo, and it chooses Kg3 for a long time before switching to Bxd8 at depth 34 with an eval of +31.17. But I need to give it more time.
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Zenmastur
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Re: Mate in 17
No engine can find it because it's not a mate in 17.... 
Regards,
Forrest
Regards,
Forrest
Only 2 defining forces have ever offered to die for you.....Jesus Christ and the American Soldier. One died for your soul, the other for your freedom.
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zullil
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Re: Mate in 17
Elaboration, please. How did you prove the non-existence of mate-in-17? Thanks.Zenmastur wrote:No engine can find it because it's not a mate in 17....
Regards,
Forrest
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Vinvin
- Posts: 5228
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- Full name: Vincent Lejeune
Re: Mate in 17
I checked it for about 15 minutes, and I found no error in the mate in 17.
White have to do all of this :
First : Play Rg3 and then :
- Take the B with Kh4-h5-h6xh7 (play a waiting move if it's needed)
- Take the queen (Rxf3) when Qf3 is played
- Take the f and a pawn on the first row (play a waiting move if it's needed)
- Then play the forced mate.
White have to do all of this :
First : Play Rg3 and then :
- Take the B with Kh4-h5-h6xh7 (play a waiting move if it's needed)
- Take the queen (Rxf3) when Qf3 is played
- Take the f and a pawn on the first row (play a waiting move if it's needed)
- Then play the forced mate.
Zenmastur wrote:No engine can find it because it's not a mate in 17....
Regards,
Forrest
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Stan Arts
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Re: Mate in 17
Black appears to be in zugzwang.
Most engines won't find it then.
Most engines won't find it then.
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zullil
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Re: Mate in 17
Even with null-move pruning disabled, Stockfish isn't finding anything ... yet:Stan Arts wrote:Black appears to be in zugzwang.
Most engines won't find it then.
Code: Select all
info depth 45 seldepth 63 multipv 1 score cp 1434 nodes 207372651868 nps 24769280 time 8372171 pv b8a6 h7g8 a6c5 g8h7 c5a4 a2a1q d1a1 e5d5 a4c3 d5c6 c7d6 e7d6 a1d1 c6d7 c3e4 d7e7 e4d6 d8e6 f5e6 f7e6 e3e4 c4c3 f1e3 h1d1 d6c8 e7f7 e3d1 f7g7 d1c3 g7f8 g2d2 h7g6 h3g3 f8e8 d2f2 e8f7