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EGTB Testsuite
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Mike Scheidl



Joined: 09 Mar 2006
Posts: 1224
PostPost subject: Re: EGTB Testsuite    Posted: Sun Feb 03, 2008 7:52 am Reply to topic Reply with quote
smirobth wrote:
Here is a position that fixes the problem of multiple moves winning:
[D]k7/P6R/2K5/8/7P/1r6/8/8 w - - 0 1
BK ::    ::    ::    ::
WP    ::    ::    :: WR
   :: WK ::    ::    ::
::    ::    ::    ::    
   ::    ::    ::    WP
:: BR ::    ::    ::    
   ::    ::    ::    ::
::    ::    ::    ::    

Now only Rh8 wins, but programs without access to the R+P vs R tablebase don't play it.


Analysis by Toga II 3.1.2SE (no bitbases, no Nalimovs):

1.h5 Rb6+ 2.Kd5 Rd6+ 3.Ke4 Rd4+ 4.Kf5 Rd7 5.Kg6 Rxh7 6.Kxh7 Kxa7
+- (3.87) Depth: 3/8 00:00:00
+- (1.95) Depth: 5/16 00:00:00
(...)
1.Rh8+ Kxa7 2.h5 Rc3+ 3.Kb5 Rb3+ 4.Kc5 Rh3 5.h6 Kb7 6.Rh7+ Ka6 7.Kd4 Rh4+ 8.Ke5 Kb5 9.Rh8 Rh5+ 10.Ke6 Kc4
+- (2.11) Depth: 8/22 00:00:00 151kN
+- (2.02) Depth: 11/26 00:00:00 435kN
1.h5 Rb6+ 2.Kd5 Rd6+ 3.Ke5 Re6+ 4.Kf4 Rf6+ 5.Ke4 Re6+ 6.Kd3 Rd6+ 7.Kc2 Rc6+ 8.Kd2 Rd6+ 9.Ke3 Re6+ 10.Kf3 Rf6+ 11.Ke2 Re6+ 12.Kd1 Re1+ 13.Kd2 Re7 14.Rh8+ Kxa7 15.h6 Kb6
+- (2.08) Depth: 11/30 00:00:00 498kN
+- (2.00) Depth: 15/34 00:00:02 2027kN
1.Rh8+ Kxa7 2.h5 Rc3+ 3.Kd6 Kb7 4.h6 Rc1 5.Ke5 Rc6 6.Kf4 Rc4+ 7.Kf5 Rc5+ 8.Ke6 Rc6+ 9.Kd5 Rg6 10.Kd4 Rg4+ 11.Ke5 Rg6 12.Rh7+ Kb6 13.Kf4 Ka6 14.Kf5 Rc6 15.Kg4 Rc4+ 16.Kg3 Rc6
+- (2.02) Depth: 15/34 00:00:03 3379kN
+- (2.03) Depth: 23/46 00:01:14 86604kN

Even here, the first move in itself is not a 100% reliable proof that endgame tables are accessed. Toga was quickly switching between various first moves during the first 3 seconds (only) though, but anyway, it means it is possible that another engine could immediatly choose Rh8+ without any tables, too... Maybe the "diagnosis" needs to take the evaluation into account.
_________________
Regards, Mike
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Subject Author Date/Time
EGTB Testsuite Kirill Kryukov Sat Feb 02, 2008 12:48 pm
      Re: EGTB Testsuite F. Bluemers Sat Feb 02, 2008 1:01 pm
            Re: EGTB Testsuite Kirill Kryukov Sat Feb 02, 2008 5:12 pm
                  Re: EGTB Testsuite F. Bluemers Sat Feb 02, 2008 5:41 pm
                        Re: EGTB Testsuite Kirill Kryukov Sun Feb 03, 2008 6:31 am
      Re: EGTB Testsuite Mike Scheidl Sat Feb 02, 2008 1:37 pm
            Re: EGTB Testsuite Kirill Kryukov Sat Feb 02, 2008 5:08 pm
                  Re: EGTB Testsuite Werner Schüle Sat Feb 02, 2008 5:29 pm
                        Re: EGTB Testsuite Kirill Kryukov Sun Feb 03, 2008 7:02 am
      Re: EGTB Testsuite Robin Smith Sat Feb 02, 2008 11:09 pm
            Re: EGTB Testsuite George Tsavdaris Sun Feb 03, 2008 12:01 am
                  Re: EGTB Testsuite Robin Smith Sun Feb 03, 2008 1:03 am
                  Re: EGTB Testsuite Robin Smith Sun Feb 03, 2008 7:08 am
                        Re: EGTB Testsuite Kirill Kryukov Sun Feb 03, 2008 7:30 am
                              Re: EGTB Testsuite Robin Smith Sun Feb 03, 2008 8:45 am
                                    Re: EGTB Testsuite Kirill Kryukov Sun Feb 03, 2008 10:19 am
                                          Re: EGTB Testsuite Robin Smith Sun Feb 03, 2008 10:33 am
                                                Re: EGTB Testsuite Kirill Kryukov Sun Feb 03, 2008 12:18 pm
                                                Re: EGTB Testsuite Greg Simpson Sun Feb 03, 2008 5:52 pm
                        Re: EGTB Testsuite Mike Scheidl Sun Feb 03, 2008 7:52 am
            Re: EGTB Testsuite Kirill Kryukov Sun Feb 03, 2008 7:04 am
      Re: EGTB Testsuite Kirill Kryukov Mon Feb 04, 2008 6:19 am
            Re: EGTB Testsuite Graham Banks Mon Feb 04, 2008 6:58 am
                  Re: EGTB Testsuite Spock Mon Feb 04, 2008 7:35 am
            Re: EGTB Testsuite Robin Smith Mon Feb 04, 2008 8:33 am
                  Re: EGTB Testsuite Kirill Kryukov Mon Feb 04, 2008 9:08 am
      Re: EGTB Testsuite MoKy Mon Feb 04, 2008 11:27 am
            Re: EGTB Testsuite Kirill Kryukov Mon Feb 04, 2008 11:56 am
            Re: EGTB Testsuite Uri Blass Mon Feb 04, 2008 1:01 pm
                  Re: EGTB Testsuite Jouni Uski Mon Feb 04, 2008 3:55 pm
                        Re: EGTB Testsuite MoKy Mon Feb 04, 2008 4:22 pm
                              Re: EGTB Testsuite Kirill Kryukov Mon Feb 04, 2008 5:33 pm
                        Re: EGTB Testsuite Kirill Kryukov Mon Feb 04, 2008 5:30 pm
            Re: EGTB Testsuite Kirill Kryukov Mon Feb 04, 2008 5:15 pm
      Re: EGTB Testsuite Dann Corbit Mon Feb 04, 2008 11:15 pm
            Re: EGTB Testsuite Kirill Kryukov Tue Feb 05, 2008 3:57 am
                  Re: EGTB Testsuite Edmund Moshammer Tue Feb 05, 2008 5:44 pm
                        Re: EGTB Testsuite Edmund Moshammer Tue Feb 05, 2008 6:07 pm
                              Re: EGTB Testsuite David Dahlem Tue Feb 05, 2008 6:22 pm
                                    Re: EGTB Testsuite Jouni Uski Tue Feb 05, 2008 9:32 pm
                                    Re: EGTB Testsuite Kirill Kryukov Wed Feb 06, 2008 5:26 pm
                                          Re: EGTB Testsuite David Dahlem Wed Feb 06, 2008 6:06 pm
                              Re: EGTB Testsuite Kirill Kryukov Wed Feb 06, 2008 5:11 pm
                              Re: EGTB Testsuite Kirill Kryukov Wed Feb 06, 2008 5:23 pm
                              Re: EGTB Testsuite Alex Brown Thu Feb 07, 2008 12:49 am
                        Re: EGTB Testsuite David Dahlem Tue Feb 05, 2008 6:20 pm
                        Re: EGTB Testsuite Kirill Kryukov Thu Feb 07, 2008 12:23 am
      Re: EGTB Testsuite Tano-Urayoan Russi Roman Thu Feb 07, 2008 4:36 am
            Re: EGTB Testsuite Kirill Kryukov Thu Feb 07, 2008 10:49 am
                  Re: EGTB Testsuite Tano-Urayoan Russi Roman Sun Feb 10, 2008 8:43 am
                        Re: EGTB Testsuite Tano-Urayoan Russi Roman Sun Feb 10, 2008 10:00 am
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