Author: Dann Corbit
Date: 17:17:23 05/05/05
Go up one level in this thread
On May 05, 2005 at 18:43:00, Jonathan Kreuzer wrote:
>This isn't for guaranteed shortest mates, but for general mate finding I use
>Slow Chess, because it's my program =) and Ruffian 1.01. Ruffian can't seem to
>find this specific one though, because it uses null-move more aggressively in
>endgames than Slow Chess. I find it's good to try a few different programs,
>since solve times can vary greatly by program between positions.
>
>Slow Chess takes about 1 second to find Mate in 7 on a AMD 2700+
>
>SlowChess Blitz WV (22 MB hash)
>FEN: 8/5K2/8/R7/8/5R2/6np/6kr w - -
>
>[9] M7 00:01.2 Ra8 Ne1 Rg8+ Ng2 Kg6 Nh4+ Kh5+ Ng2 Kg4 Ne1 Kh3+ Ng2 Rxg2+
>#mate
>[8] M7 00:01.1 Ra8 Ne1 Rg8+ Ng2 Kg6 Nh4+ Kh5+ Ng2 Kg4 Ne1 Kh3+ Ng2 Rxg2+
>#mate
>[8] 4.40 00:01.1 Ra8 {++}
>[8] 4.40 00:00.6 Ra1+
>[8] 4.28 00:00.6 Ra1+ {++}
>[8] 4.28 00:00.4 Kf6 Ne1 Rg5+ Ng2 Rfg3 Kf2 Rxg2+ Kf3 R5g3+ Ke4 Re2+ Kf4 Rg7
>[7] 4.08 00:00.3 Kf6 Ne1 Rg5+ Ng2 Rfg3 Kf2 Rxg2+ Kf3 R5g3+ Ke4 Rg7
>[7] 3.92 00:00.3 Kf6 {++}
>[7] 3.92 00:00.1 Ke6 Ne3 Rg5+ Ng2 Rc3 Kf1 Rf5+ Nf4+ Rxf4+ Kg2 Rg4+ Kf2 Kd5
>[6] 3.68 00:00.0 Ke6 Ne3 Rg5+ Ng2 <tt>
>[5] 3.68 00:00.0 Ke6 Ne1 Rg5+ Ng2 Rfg3 Kf2 Rxg2+ Kf3
>[4] 0.44 00:00.0 Ke6 Ne1 Rg5+ Ng2 Rg7
>[4] 0.00 00:00.0 Ke6 {++}
>[4] 0.00 00:00.0 Ra1+ Ne1 Rxe1+ Kg2 Ree3 Rf1 Rxf1 Kxf1
>[3] 2.60 00:00.0 Ra1+ Ne1 Rxe1+ Kg2 Ree3 Rf1
>[2] 3.00 00:00.0 Ra1+ Ne1 Rxe1+ Kg2 Ree3
That is a very impressive result. I will have to put it into my standard pile
of engines to throw at problems.
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