Author: Robert Hyatt
Date: 07:12:21 01/03/02
Go up one level in this thread
On January 03, 2002 at 01:05:14, Jouni Uski wrote:
>[D]k7/P7/P7/P7/P7/P7/P7/R3K3 w Q - 0 1
>
>Mate in 8
>
>I tried this at home with Tiger14 and Fritz7 and Shredder5.32. None of them has
>any idea about mate in 8. Then I tried with Mate2.1, but no solution under 30
>minutes. What's the problem? Only Yace gives CORRECT mate in few seconds. Is
>this null move problem?
>
>Jouni
This isn't particularly hard... here is my output from a P3/750 laptop:
13-> 16.78 Mat11 1. O-O-O Kxa7 2. Rd7+ Ka8 3. Kc2 Kb8
4. Kc3 Ka8 5. Rd8+ Ka7 6. Kc2 Kxa6
<HT>
14 24.59 Mat09 1. O-O-O Kxa7 2. Rd7+ Ka8 3. Kc2 Kb8
4. Kc3 Ka8 5. Rd8+ Ka7 6. Kc4 Kxa6
7. Rd7 Kxa5 8. Rd6 Kxa4 9. Ra6#
14-> 28.78 Mat09 1. O-O-O Kxa7 2. Rd7+ Ka8 3. Kc2 Kb8
4. Kc3 Ka8 5. Rd8+ Ka7 6. Kc4 Kxa6
7. Rd7 Kxa5 8. Rd6 Kxa4 9. Ra6#
15 1:06 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 5. Rd5 Kxa3 6. Rd4 Kxa2
7. Rd3 Ka1 8. Ra3#
15-> 1:16 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 5. Rd5 Kxa3 6. Rd4 Kxa2
7. Rd3 Ka1 8. Ra3#
Takes a bit to find the shortest mate, but it finds a mate very quickly,
starting at about 1.5 seconds...
With tablebases, it finds the correct mate quicker:
10 1.90 ++ 1. Ke2!!
(2) 10 2.22 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 <HT>
(3) 10-> 2.41 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 <HT>
(2) 11 2.83 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 <HT>
(3) 11-> 3.85 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 <HT>
(2) 12 4.35 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 <HT>
(2) 12-> 5.25 Mat08 1. O-O-O Kxa7 2. Rd8 Kxa6 3. Rd7 Kxa5
4. Rd6 Kxa4 <HT>
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