Author: Tim Foden
Date: 13:10:29 10/10/01
Go up one level in this thread
On October 10, 2001 at 15:54:52, Dann Corbit wrote: >On October 10, 2001 at 15:31:17, Dann Corbit wrote: > >>On October 10, 2001 at 09:23:21, Tim Foden wrote: >> >>>Green Light Chess (96MB Hash, 920MHz Duron, no tablebases) claims that Rg3 is a >>>mate in 11 after 2 mins 30 secs, and that it is a mate in 10 after 4 mins 59 >>>secs. Finally it finds a different line for mate in 10 after 7 mins 56 secs. >>> >>> 14 2:30 +Mate11 118131k Rg3 2. Kc5 h3 3. b8=Q Rxb8 4. Rd1 g1=Q+ 5. Rxg1 >>> Rxg1 6. Kd4 h2 7. Kc4 h1=Q 8. Kd4 Rd1+ 9. Ke3 >>> Re8+ 10. Kf2 Rd2+ 11. Kg3 Rg8# >>> 15 4:59 +Mate10 236044k Rg3 2. b8=Q Rxb8 3. Kc5 h3 4. Kd6 h2 5. Ra1 g1=Q 6. >>> Ra5+ Kf6 7. Ra6 Rb6+ 8. Kc7 Rxa6 9. Kd7 Rg7+ 10. >>> Kd8 Ra8# >>> 16 7:56 +Mate10 388591k Rg3 2. Kc5 h3 3. Kc6 h2 4. Rd1 g1=Q 5. Rd5+ Ke4 6. >>> Rb5 Rxb5 7. Kxb5 Qc1 8. Kb4 Qc2 9. b8=Q Rb3+ 10. >>> Ka4 Qa2# >>> >> >>That's a truly astonishing result! Finding the closest mate faster than a >>dedicated mate solver. It seems if GLC can work itself into an advantageous >>position, it can really exploit it. > >It seems that hash helps this problem a lot. Increasing the hash lead to >correct solution in about 4 minutes on a machine about the same speed as yours. >It seems that you cannot increase the hash above 192 Megs. No. It's another thing to go on my todo list! It is one of the easiest ones, though. Perhaps I should add 384MB, 768MB, and 1536MB to the options and release version 2.15d?? >I also notice that there is no way to add in tablebase files. The reason seems >clear -- you don't need 'em! >;-) Also on my todo list :) >>hash 300 > >Hash table size set to: 192.0MB >>epd 999 \m10.epd m10.out > Line 001: Test [Rg3]... >> > 14 47.02 ++ 39879k Rg3 (a=-321.00 b=21.31 e=21.31) > 14 2:07 +Mate11 114305k Rg3 2. Kc5 h3 3. b8=Q Rxb8 4. Rd1 g1=Q+ 5. Rxg1 > Rxg1 6. Kd4 h2 7. Kc4 h1=Q 8. Kd4 Rd1+ 9. Ke3 > Re8+ 10. Kf2 Rd2+ 11. Kg3 Rg8# > 14 2:07 +Mate11 114305k Rg3 2. Kc5 h3 3. b8=Q Rxb8 4. Rd1 g1=Q+ 5. Rxg1 > Rxg1 6. Kd4 h2 7. Kc4 h1=Q 8. Kd4 Rd1+ 9. Ke3 > Re8+ 10. Kf2 Rd2+ 11. Kg3 Rg8# > 15 2:09 -- 117087k Rg3 (a=320.98 b=321.00 e=320.98) > 15 2:34 ++ 139315k Rg3 (a=-321.00 b=320.98 e=320.98) > 15 4:09 +Mate10 224669k Rg3 2. b8=Q Rxb8 3. Kc5 h3 4. Kd6 h2 5. Ra1 g1=Q 6. > Ra5+ Kf6 7. Ra6 Rb6+ 8. Kc7 Rxa6 9. Kd7 Rg7+ 10. > Kd8 Ra8# > 15 4:09 +Mate10 224670k Rg3 2. b8=Q Rxb8 3. Kc5 h3 4. Kd6 h2 5. Ra1 g1=Q 6. > Ra5+ Kf6 7. Ra6 Rb6+ 8. Kc7 Rxa6 9. Kd7 Rg7+ 10. > Kd8 Ra8# > 16 4:21 -- 236288k Rg3 (a=320.98 b=321.00 e=320.98) > 16 5:43 ++ 307438k Rg3 (a=-321.00 b=320.98 e=320.98) > 16 6:31 +Mate10 363016k Rg3 2. Kc5 h3 3. Kc6 h2 4. Rd1 g1=Q 5. Rd5+ Ke4 6. > Rb5 Rxb5 7. Kxb5 Qc1 8. Kb4 Qc2 9. b8=Q Rb3+ 10. > Ka4 Qa2# > 16 6:31 +Mate10 363016k Rg3 2. Kc5 h3 3. Kc6 h2 4. Rd1 g1=Q 5. Rd5+ Ke4 6. > Rb5 Rxb5 7. Kxb5 Qc1 8. Kb4 Qc2 9. b8=Q Rb3+ 10. > Ka4 Qa2# Yep, large hash seems to help a lot for this problem. Cheers, Tim.
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