What's the shortest mate?

[mariaclara]

3 moves

Re: What's the shortest mate?

[swami]

3 moves

Re: What's the shortest mate?

2 moves if you meant from start position:

1. f4 e6
2. g4 Qh4#

[David Dahlem]

I believe it's a mate in 18. The problem with your mate is 16 Rh6+ is wrong. To delay mate white plays Rxf2.
Jim

Yes, it's indeed a #18. But the wrong move in the original solution is already 9.Rd8+.

Here's the ChestUCI solution:
8/2ppppp1/rpR3k1/8/8/6p1/5pP1/7K b - - bm #18; 00:05 @ C0/R1/K1/P1/X14;

1...d6 2.Rxd6+ f6 3.Rxf6+ Kh7 4.Rh6+ Kg8 5.Rh8+ Kf7 6.Rf8+ Ke6 7.Rf6+ Kd7 8.Rd6+ Kc8 9.Rd1 b5 10.Rd8+ Kb7 11.Rb8+ Kc6 12.Rb6+ Kd7 13.Rd6+ Ke8 14.Rd8+ Kf7 15.Rf8+ Kg6 16.Rf6+ Kh7 17.Rxf2 Ra1+ 18.Rf1 Rxf1#

Hi Franz

How do you set Chest to use the "C0/R1/K1/P1/X14" parameters? I'm using the latest 5.1 version.

Thanks
Dave

[F.Huber]

How do you set Chest to use the "C0/R1/K1/P1/X14" parameters? I'm using the latest 5.1 version.

Very easy, David:

SearchDepth=18
SearchMode = Special
ChecksOnly = 0
ThreatDepth = 1
KingSquares = 1
PieceLimit = 1
MaxMoves = 14

Or let ChestUCI do it for you -
set SearchMode=Special and put the following line in the clipboard before starting ChestUCI's search:
8/2ppppp1/rpR3k1/8/8/6p1/5pP1/7K b - - bm #18; 00:05 @ C0/R1/K1/P1/X14;

Or the 3rd method:
set SearchDepth=18 and SearchMode=AutoTurbo, and ChestUCI will find these parameters himself.

You see: "Many roads lead to Rome"!

Regards,
Franz

[David Dahlem]

Thanks Franz

It's very easy only if you know how. Now i know how.

[zullil]

[d] 8/2ppppp1/rpR3k1/8/8/6p1/5pP1/7K b - - 0 1

This is supposed to be a mate in 16. Lots of engines find a mate in 18

Including the Firebird beta:

Code: Select all

info depth 21
info currmove d7d6 currmovenumber 1
info multipv 1 time 7564 nodes 3231258 nps 427000 score mate 18 depth 21 pv d7d6 c6d6 f7f6 d6f6 g6h7 f6h6 h7g8 h6h8 g8f7 h8f8 f7e6 f8f6 e6d7 f6d6 d7c8 d6d1 b6b5 d1d8 c8b7 d8b8 b7c6 b8b6 c6d7 b6d6 d7e8 d6d8 e8f7 d8f8 f7g6 f8f6 g6h7 f6f2 a6a1 f2f1 a1f1