Is this old test position still difficult?

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Howard E
Posts: 261
Joined: Wed Mar 08, 2006 8:49 pm

Is this old test position still difficult?

Post by Howard E »

Remember this one from the Louget test suite?

[d] 8/5Bp1/4P3/6pP/1b1k1P2/5K2/8/8 w - - bm Kg4;
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ernest
Posts: 2053
Joined: Wed Mar 08, 2006 8:30 pm

Re: Is this old test position still difficult?

Post by ernest »

Rybka 3 finds it quickly (Core 2 Duo @3GHz, 512MB hash), but doesn't say how... (that bug should be corrected in an upcoming Rybka 3+ update)

1.fxg5 Ke5[] 2.h6 gxh6[] 3.gxh6 Kd6 4.h7 Bc3[] 5.Kg4 Ke7 6.Kf5 Bf6 7.Bh5 Bh8 8.Bf3 Bf6 9.Be4 Bd4 10.Bh1 Bg7 11.Bd5 Bd4 12.Bc6 Bh8
+- (1.43) Depth: 26 00:00:24 1857kN, tb=3967
1.Kg4
+- (1.63 !) Depth: 26 00:01:07 4530kN, tb=14579
1.Kg4
+- (1.83 !) Depth: 26 00:01:42 6901kN, tb=24367
1.Kg4
+- (2.23 !) Depth: 26 00:02:22 8744kN, tb=37931
1.Kg4
+- (3.03 !) Depth: 26 00:03:42 12603kN, tb=66550
1.Kg4
+- (4.63 !) Depth: 26 00:05:22 17898kN, tb=102765
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Is this old test position still difficult?

Post by bob »

looks fairly easy at todays speeds. Current Crafty, 8-core 2.33ghz xeon box:

Code: Select all

               26->  17.00   2.83   1. fxg5 Ke5 2. h6 gxh6 3. gxh6 Kd6
                                    4. h7 Bc3 5. Bg8 Ba1 6. Kg4 Bb2 7.
                                    Kh5 Bh8 8. Kh6 Ke7 9. Kg6 Ba1 10. Kh5
                                    Bh8 11. Kg5 Ba1 12. Kg6 Bh8 13. Bf7
                                    Kf8 (s=5)
               27    19.41   2.75   1. fxg5 Ke5 2. h6 gxh6 3. gxh6 Kd6
                                    4. h7 Bc3 5. Bg8 Ba1 6. Kg4 Bb2 7.
                                    Kh5 Bh8 8. Kh6 Ke7 9. Kg6 Ba1 10. Kh5
                                    Bh8 11. Kg5 Ba1 12. Kg6 Bh8 13. Bf7
                                    Kf8 14. Bg8 (s=4)
               27    44.97     +1   1. Kg4!                    
               27     1:09     +3   1. Kg4!                    
               27     1:18     +M   1. Kg4!                    
               27     1:43   5.77   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Bg6 Bf4 12. h7 Bg5 13. h8=Q Bf6+
                                    14. Kg8 Bxh8 15. Kxh8
               27->   1:43   5.77   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Bg6 Bf4 12. h7 Bg5 13. h8=Q Bf6+
                                    14. Kg8 Bxh8 15. Kxh8
               28     1:55   6.10   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Be6 Bh4 12. h7 Bf6+ 13. Kg8 Ke4
                                    14. h8=Q Bxh8 15. Kxh8 Ke5
               28->   2:04   6.10   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Be6 Bh4 12. h7 Bf6+ 13. Kg8 Ke4
                                    14. h8=Q Bxh8 15. Kxh8 Ke5
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Is this old test position still difficult?

Post by bob »

bob wrote:looks fairly easy at todays speeds. Current Crafty, 8-core 2.33ghz xeon box:

Code: Select all

               26->  17.00   2.83   1. fxg5 Ke5 2. h6 gxh6 3. gxh6 Kd6
                                    4. h7 Bc3 5. Bg8 Ba1 6. Kg4 Bb2 7.
                                    Kh5 Bh8 8. Kh6 Ke7 9. Kg6 Ba1 10. Kh5
                                    Bh8 11. Kg5 Ba1 12. Kg6 Bh8 13. Bf7
                                    Kf8 (s=5)
               27    19.41   2.75   1. fxg5 Ke5 2. h6 gxh6 3. gxh6 Kd6
                                    4. h7 Bc3 5. Bg8 Ba1 6. Kg4 Bb2 7.
                                    Kh5 Bh8 8. Kh6 Ke7 9. Kg6 Ba1 10. Kh5
                                    Bh8 11. Kg5 Ba1 12. Kg6 Bh8 13. Bf7
                                    Kf8 14. Bg8 (s=4)
               27    44.97     +1   1. Kg4!                    
               27     1:09     +3   1. Kg4!                    
               27     1:18     +M   1. Kg4!                    
               27     1:43   5.77   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Bg6 Bf4 12. h7 Bg5 13. h8=Q Bf6+
                                    14. Kg8 Bxh8 15. Kxh8
               27->   1:43   5.77   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Bg6 Bf4 12. h7 Bg5 13. h8=Q Bf6+
                                    14. Kg8 Bxh8 15. Kxh8
               28     1:55   6.10   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Be6 Bh4 12. h7 Bf6+ 13. Kg8 Ke4
                                    14. h8=Q Bxh8 15. Kxh8 Ke5
               28->   2:04   6.10   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Bg3 10. f5 Ke5
                                    11. Be6 Bh4 12. h7 Bf6+ 13. Kg8 Ke4
                                    14. h8=Q Bxh8 15. Kxh8 Ke5
I left it running without noticing. Here is the current results:

Code: Select all

               31->  14:32   7.87   1. Kg4 Be7 2. Kf5 g4 3. Kxg4 Ke4 4.
                                    Be8 Kd5 5. Kf5 Kd6 6. Kg6 Kxe6 7. Bf7+
                                    Kd6 8. Kxg7 Bh4 9. h6 Be1 10. h7 Bc3+
                                    11. Kg8 Ke7 12. Bg6 Kd6 13. h8=Q Bxh8
                                    14. Kxh8 Kc7 15. Kg7 Kd8 16. f5 Kc7
                                    17. f6
               32    15:08     +1   1. Kg4!                    
               32    16:24     +3   1. Kg4!
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Jouni
Posts: 3652
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Re: Is this old test position still difficult?

Post by Jouni »

Fritz is fast (P2400):

Analysis by Fritz 10:

1.fxg5 Ke5
± (0.92) Depth: 17/25 00:00:03 2728kN, tb=679
1.fxg5 Ke5 2.Kg4 Be7 3.g6 Kf6 4.Be8 Bf8 5.Bd7 Bd6 6.Bc8 Be5 7.Kf3 Bd6 8.Ke4 Ke7 9.Kf5
² (0.68) Depth: 17/27 00:00:04 4745kN, tb=994
1.Kg4
² (0.69) Depth: 17/27 00:00:07 7514kN, tb=1646
1.Kg4
± (0.84) Depth: 17/28 00:00:09 9326kN, tb=2126
1.Kg4
± (1.16) Depth: 17/31 00:00:12 11962kN, tb=2755
1.Kg4 gxf4 2.Kxf4 Bf8 3.Kg5 Ke5 4.Kg6 Kf4 5.Kh7 Kg5 6.Kg8 Bc5
± (1.23) Depth: 18/35 00:00:19 17908kN, tb=4316
1.Kg4
+- (1.51) Depth: 19/38 00:00:38 30437kN, tb=8256
1.Kg4 gxf4 2.Kxf4 Bf8 3.Kg5 Ke5 4.Kg6 Kf4 5.Be8 Kg4 6.Kf7 Bc5 7.Kxg7 Kf5 8.Bf7
+- (1.52) Depth: 20/42 00:01:01 50441kN, tb=15524

Jouni
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bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Is this old test position still difficult?

Post by bob »

Jouni wrote:Fritz is fast (P2400):

Analysis by Fritz 10:

1.fxg5 Ke5
± (0.92) Depth: 17/25 00:00:03 2728kN, tb=679
1.fxg5 Ke5 2.Kg4 Be7 3.g6 Kf6 4.Be8 Bf8 5.Bd7 Bd6 6.Bc8 Be5 7.Kf3 Bd6 8.Ke4 Ke7 9.Kf5
² (0.68) Depth: 17/27 00:00:04 4745kN, tb=994
1.Kg4
² (0.69) Depth: 17/27 00:00:07 7514kN, tb=1646
1.Kg4
± (0.84) Depth: 17/28 00:00:09 9326kN, tb=2126
1.Kg4
± (1.16) Depth: 17/31 00:00:12 11962kN, tb=2755
1.Kg4 gxf4 2.Kxf4 Bf8 3.Kg5 Ke5 4.Kg6 Kf4 5.Kh7 Kg5 6.Kg8 Bc5
± (1.23) Depth: 18/35 00:00:19 17908kN, tb=4316
1.Kg4
+- (1.51) Depth: 19/38 00:00:38 30437kN, tb=8256
1.Kg4 gxf4 2.Kxf4 Bf8 3.Kg5 Ke5 4.Kg6 Kf4 5.Be8 Kg4 6.Kf7 Bc5 7.Kxg7 Kf5 8.Bf7
+- (1.52) Depth: 20/42 00:01:01 50441kN, tb=15524

Jouni
Fritz is lucky. The eval is hardly changing. This is a crush once you see "the truth"...
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