Test position: surprising shot in the endgame

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Brunetti
Posts: 424
Joined: Tue Dec 08, 2009 1:37 pm
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Full name: Alex Brunetti

Test position: surprising shot in the endgame

Post by Brunetti »

[d]8/p7/Pp6/1P3K2/4P3/8/6Np/b6k w - - 0 1

From a study by Libiurkin and Bondarenko. I wonder how many engines can find the surprising shot in the solution. Anyway, White mates in less than 30.

Alex
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GARGAMEL
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Re: Test position: surprising shot in the endgame

Post by GARGAMEL »

Hallo ALEX!

No problem for DEEP FRITZ 10!!

Bondarenko,F & Liburkin,M - _, Sh4 1950
8/p7/Pp6/1P3K2/4P3/8/6Np/b6k w - - 0 1

Analysis by Deep Fritz 10:

1.Sh4!! Kg1 2.Sf3+
-/+ (-1.25) Tiefe: 5/9 00:00:00 2kN :D
+- (3.38) Tiefe: 29/71 00:07:44 3136mN, tb=39263

best regard Anton
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zullil
Posts: 6442
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Full name: Louis Zulli

Re: Test position: surprising shot in the endgame

Post by zullil »

Brunetti wrote:[d]8/p7/Pp6/1P3K2/4P3/8/6Np/b6k w - - 0 1

From a study by Libiurkin and Bondarenko. I wonder how many engines can find the surprising shot in the solution. Anyway, White mates in less than 30.

Alex
Stockfish-1.6.2 (8 threads) to depth 40:

Code: Select all

Searching: 8/p7/Pp6/1P3K2/4P3/8/6Np/b6k w - -
infinite: 1 ponder: 0 time: 0 increment: 0 moves to go: 0
 2     -5.09   00:00       40 Nf4 Kg1 
 3     -5.01   00:00      163 Nf4 Kg1 Nh3+ Kf1 
 4     -8.61   00:00      494 Nf4 Kg1 e5 h1=Q e6 Qh7+ Kg4 
 4     -4.04   00:00      815 Ne1 Bh8 e5 Kg1 Nf3+ Kg2 
 5     -2.55   00:00     1624 Ne1 Bd4 Nf3 Kg2 Nxh2 Kxh2 
 6     -2.55   00:00     2080 Ne1 Bd4 Nf3 Kg2 Nxh2 Kxh2 
 7     -2.22   00:00     3033 Ne1 Bd4 Nf3 Kg2 Nxh2 Kxh2 e5 Kg3 
 8  >  -1.58   00:00     4290 Ne1 Bg7 Nf3 Bf8 e5 Kg2 Nxh2 
 9     -0.69   00:00     7073 Ne1 Bg7 Nf3 Bf8 e5 Kg2 Nxh2 Kxh2 e6 Be7 Ke5 
10     -0.77   00:00    17606 Ne1 Bd4 e5 Bc5 e6 Kg1 Nf3+ Kg2 Nxh2 Kxh2 Kf6 Kg3 
                              e7 Bxe7+ Kxe7 Kf4 
11     -0.69   00:00    24557 Ne1 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Kg6 Kg2 
                              Kf7 Kf3 
12  >  -0.44   00:00    31946 Ne1 Bc3 Nf3 Bb4 e5 Be7 e6 Bd8 Kg4 Kg2 Nxh2 Kxh2 
                              Kf5 
13     -0.53   00:00    54601 Ne1 Bc3 Nf3 Bb4 e5 Kg2 Nxh2 Kxh2 Kf6 Kg3 e6 Kf4 
                              e7 Bxe7+ Kxe7 Ke5 Kd7 Kd5 Kc7 Kc5 Kb7 
13     -0.12   00:00    69102 Nh4 Bd4 e5 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e6 Bc5 Kf6 Kg3 
                              e7 Bxe7+ Kxe7 Kf4 Kd6 Ke4 Ke6 Kd4 Kf7 Kc5 
14     -0.28   00:00   115014 Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Kg6 Kg2 
                              Kf7 Kf3 e7 Bxe7 Kxe7 Ke4 Kd6 Kd4 Kc6 Kc4 Kb7 
15     -0.28   00:00   165819 Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Kg6 Kg2 
                              Kf7 Kf3 e7 Bxe7 Kxe7 Ke3 Kd6 Ke4 Kc6 Kd4 Kb7 
16  >  -0.08   00:00   204223 Nh4 Bb2 e5 Ba3 e6 Be7 Nf3 Kg2 Nxh2 Kxh2 Kg6 Bd8 
                              Kf7 Kg3 e7 Bxe7 Kxe7 Kf4 Kd7 Ke4 Kd6 Kd4 Kc6 Kc4 
                              Kb7 
17     -0.53   00:00   356180 Nh4 Bc3 e5 Be1 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Kg6 Kg3 
                              Kf7 Kf4 e7 Bxe7 Kxe7 Ke5 Kd7 Kd5 Kc7 Kc5 Kb7 
18     -0.36   00:00   567909 Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Kg6 Kg3 
                              Kf7 Kf4 e7 Bxe7 Kxe7 Ke5 Kd7 Kd5 Ke7 Kc5 
19  >  +0.61   00:00   731081 Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Ke5 Kg3 
                              Kd6 Kf4 Kc6 Be7 Kb7 
20     -0.16   00:00   949880 Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Ke5 Kg3 
                              Kd6 Kf4 Kc6 Ke5 Kb7 Kxe6 Kxa7 Bd8 Kb7 Ke5 a7 
21     +0.00   00:00    1605k Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Ke5 Kg3 
                              Kd6 Kf4 Kc6 Ke5 Kb7 Kd6 Kxa7 Kc7 Ka8 Bf6 a7 Be7 
22     +0.16   00:00    2278k Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Ke5 Kg3 
                              Kd6 Kf4 e7 Bxe7+ Kxe7 Ke5 Kd7 Kf6 Kc7 Ke7 Kc6 Kd8 
                              Kd6 Kc8 Kd5 Kd7 Kd4 Ke6 Ke4 Kd6 
23     +0.00   00:01    2870k Nh4 Bd4 e5 Bf2 Nf3 Kg2 Nxh2 Kxh2 e6 Bh4 Ke5 Kg3 
                              Kd6 Kf4 e7 Bxe7+ Kxe7 Ke5 Kd7 Kf6 Kc7 Ke7 Kc6 Ke6 
                              Kb7 Kd7 Kxa7 Kc7 Ka8 Kc8 a7 Kc7 
24  >  +0.48   00:01    5552k Nh4 Bc3 e5 Be1 Nf3 Kg2 Nxh2 Kxh2 Ke4 Kg3 e6 Bb4 
                              Kd5 Bc5 Kc6 Kf4 Kb7 Ke5 Kxa7 Kxe6 Kb7 
25  >  +2.59   00:01   10371k Nh4 Bc3 e5 Bb2 e6 Bc3 e7 Kg1 Nf3+ Kg2 Nxh2 
26     +7.35   00:06   52611k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Bd4 Kd7 
                              Kg3 Kc6 Kf4 Kb7 Ke4 Kxa7 Kd5 Kb7 Kc5 a7 Kxb5 a8=Q 
                              Kc5 Qd8 Kc4 Qg8+ Kc3 Qd5 Bc5 Kc6 Bd4 Qf5 Bc5 Kd5 
                              Kd2 
27     +7.76   00:09   71714k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Bd4 Kd7 
                              Kg3 Kc6 Kf4 Kb7 Ke4 Kxa7 Kd5 Kb7 Kc5 a7 Kxb5 a8=Q 
                              Kc5 Qd8 Kc4 Qg8+ Kc3 Qd5 Bc5 Kc6 Bd4 Qf3+ Kc4 Qe4 
                              Kc3 Kd5 Bc5 Qe6 Kd2 Qg4 
28     +7.96   00:14  101583k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Bd4 Kd7 
                              Kg3 Kc6 Kf4 Kb7 Ke4 Kxa7 Kd5 Kb7 Kc5 a7 Kxb5 a8=Q 
                              Kc4 Kc6 Kd3 Qa3+ Ke4 Qe7+ Kd3 Qh7+ Kd2 Kd5 Bc5 
                              Qe4 Kc3 Qc4+ Kd2 Ke4 Ke1 Qd3 Kf2 Qd2+ Kg3 Qf4+ 
                              Kg2 Qf3+ Kh2 
29     +8.36   00:20  143610k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg3 Kd7 
                              Kf4 Kc8 Ke4 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Bc3 a8=Q 
                              Ba5 Qc8 Kb4 Kc6 Kc4 Qd7 Kc3 Qd5 Kc2 Qc4+ Kd2 Kd5 
                              Ke3 Qe4+ Kf2 
30     +8.53   00:27  193409k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg3 Kd7 
                              Kf4 Kc8 Ke4 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Bd4 a8=Q 
                              Kc4 Kc6 Bc5 Qa4+ Kd3 Kd5 Ke3 Qg4 Kd3 Qf3+ Kc2 Ke4 
                              Kd2 Qd3+ Kc1 Qc3+ Kb1 Qd2 Ka1 Qc2 Be7 
31  >  +9.25   00:34  243270k Nh4 Bc3 e5 Bb2 Ke4 Kg1 Nf3+ Kf2 Nxh2 Kg3 Nf3 Kg4 
                              e6 Bf6 Ne5+ Kh5 Nc6 Kg6 Nxa7 Bh8 Nc6 Kf6 a7 
32     +9.21   00:49  374664k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg3 Kd7 
                              Kf4 Kc8 Ke4 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Bd4 a8=Q 
                              Kc4 Kc6 Bc5 Qa4+ Kd3 Kd5 Ke3 Qe4+ Kd2 Qf4+ Ke2 
                              Ke4 Bf2 Qf8 b5 Qb4 Kf1 Qxb5+ Kg2 Qe2 
33  > +12.20   00:58  452437k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg3 Kd7 
                              Kf4 Kc8 Ke4 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Bd4 a8=Q 
                              Kc4 Kc6 Bc5 Qa6+ Kc3 Kd5 Kd2 Ke4 Kc3 Qd3+ Kb2 Kd5 
                              Ba3 Qd4+ Kc2 Qxb6 Bc1 Qf2+ Kd3 Qe1 Kc2 Kc4 Kb1 
                              Qe4+ Kb2 Qd3 Bg5 Qd4+ Kc2 Qf2+ Kc1 Qf1+ Kb2 Qg2+ 
34  > +24.93   01:41  827276k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kf2 e5 Ke2 e6 Kd3 e7 Bc3 
                              e8=Q Be1 
35  > +75.84   02:10    1081M Nh4 Bb2 e5 Ba3 Ke4 Kg1 Nf3+ Kg2 Nxh2 Kh3 e6 Kg3 
                              Nf3 Kg4 Kd5 Bc5 Ne5+ Kf5 Nc6 Kg6 Nxa7 Bg1 Nc6 Kg7 
                              a7 
36    +88.94   04:38    2407M Nh4 Bg7 Ke6 Kg1 Nf3+ Kf2 Nxh2 Ke3 Kd5 Kd3 Nf3 Kc3 
                              e5 Kb4 Kc6 Ka5 Kb7 Kxb5 Kxa7 Kc4 Kb8 Kc3 a7 Kb2 
                              a8=Q Bf8 Kb7 Bc5 e6 Kb3 e7 Bxe7 Qg8+ Kb4 Qa2 Bc5 
                              Qc2 b5 Qb2+ Kc4 Nd2+ Kd3 Qxb5+ Kxd2 Qxc5 Ke2 
37    +89.05   05:37    2947M Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg2 Kd5 
                              Kf2 Kc6 Ke3 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Kb4 a8=Q 
                              Kc5 Qa3+ Kd4 Kxb6 Ke4 Qa8+ Kf5 Qf3+ Kg5 Qd5 Kf4 
                              Kc6 Bf6 Qh5 Bg5 Kd5 Bf6 Ke6 Bg5 Qh3 Ke4 Qf5+ Ke3 
                              Qxg5+ Kd3 
38    +89.05   06:12    3256M Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg2 Kd5 
                              Kf2 Kc6 Ke3 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Kb4 a8=Q 
                              Kc5 Qa3+ Kd4 Kxb6 Ke4 Qa8+ Kf5 Qf3+ Kg5 Qd5 Kf4 
                              Kc6 Bf6 Qf7 Kg5 Kd5 Kf5 Qh7+ Kf4 Qe4+ Kg5 Ke6 Ba1 
                              Qg2+ Kf4 Qf1+ Ke3 Qxa1 
39    +89.05   09:13    5071M Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg2 Kd5 
                              Kf2 Kc6 Ke3 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Kb4 a8=Q 
                              Kc5 Qa3+ Kd4 Kxb6 Ke4 Qa8+ Kf5 Qf3+ Kg5 Qd5 Kf4 
                              Kc6 Bf6 Qf7 Kg5 Kd5 Kf5 Qh7+ Kf4 Qe4+ Kg5 Ke6 Ba1 
                              Qg2+ Kf4 Qf1+ Ke3 Qxa1 
40    +89.05   12:46    7151M Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Kg2 Kd5 
                              Kf2 Kc6 Ke3 Kb7 Kd4 Kxa7 Kc5 Kb7 Kxb5 a7 Kb4 a8=Q 
                              Kc5 Qa3+ Kd4 Kxb6 Ke4 Qa8+ Kf5 Qf3+ Kg5 Qd5 Kf4 
                              Kc6 Bf6 Qf7 Kg5 Kd5 Kf5 Qh7+ Kf4 Qe4+ Kg5 Ke6 Ba1 
                              Qg2+ Kf4 Qf1+ Ke3 Qxa1 
Nodes: 8097009093
Nodes/second: 9332243
Best move: Nh4
Ponder move: Kg1
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Brunetti
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Full name: Alex Brunetti

Re: Test position: surprising shot in the endgame

Post by Brunetti »

zullil wrote:26 +7.35 00:06 52611k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Bd4 Kd7
Kg3 Kc6 Kf4 Kb7 Ke4 Kxa7 Kd5 Kb7 Kc5 a7 Kxb5 a8=Q
Kc5 Qd8 Kc4 Qg8+ Kc3 Qd5 Bc5 Kc6 Bd4 Qf5 Bc5 Kd5
Kd2
Good job for Stockfish. The surprising shot is 5.Ke6!! and the Bishop is left there to obstruct Black King's path to c7. 5.Kxe5 only draws.

Alex
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Brunetti
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Re: Test position: surprising shot in the endgame

Post by Brunetti »

GARGAMEL wrote:-/+ (-1.25) Tiefe: 5/9 00:00:00 2kN :D
Well, 1.Nh4 is not the point, as Fritz's -1.25 shows. How long does it take to find the line with 5.Ke6? :D

Alex
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zullil
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Full name: Louis Zulli

Re: Test position: surprising shot in the endgame

Post by zullil »

Brunetti wrote:
zullil wrote:26 +7.35 00:06 52611k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Bd4 Kd7
Kg3 Kc6 Kf4 Kb7 Ke4 Kxa7 Kd5 Kb7 Kc5 a7 Kxb5 a8=Q
Kc5 Qd8 Kc4 Qg8+ Kc3 Qd5 Bc5 Kc6 Bd4 Qf5 Bc5 Kd5
Kd2
Good job for Stockfish. The surprising shot is 5.Ke6!! and the Bishop is left there to obstruct Black King's path to c7. 5.Kxe5 only draws.

Alex

[d]8/p7/Pp6/1P2bK2/8/8/7k/8 w - - 0 4
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Uri Blass
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Re: Test position: surprising shot in the endgame

Post by Uri Blass »

Brunetti wrote:
GARGAMEL wrote:-/+ (-1.25) Tiefe: 5/9 00:00:00 2kN :D
Well, 1.Nh4 is not the point, as Fritz's -1.25 shows. How long does it take to find the line with 5.Ke6? :D

Alex
This evaluation is based on depth 5
If you look at the post you can see later clearly positive evaluation by Fritz so I guess that Fritz also see the point.
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zullil
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Re: Test position: surprising shot in the endgame

Post by zullil »

Brunetti wrote:[d]8/p7/Pp6/1P3K2/4P3/8/6Np/b6k w - - 0 1

Alex

Code: Select all

Crafty v23.1 (8 cpus)

White(1): egtb=off
White(1): setboard 8/p7/Pp6/1P3K2/4P3/8/6Np/b6k w - - 0 1
White(1): st 900
search time set to 900.00.
White(1): display stats
display statistics at end of each search.
White(1): go
              time limit 15:00 (+0.00) (15:00)
              depth   time  score   variation (1)
starting thread 1
starting thread 2
starting thread 3
starting thread 4
starting thread 5
starting thread 6
starting thread 7
               15     0.05  -0.48   1. Nh4 Bg7 2. Nf3 Bf8 3. e5 Be7 4.
                                    e6 Kg2 5. Nxh2 Kxh2 6. Kg6 Kg3 7. Kf7
                                    Bc5 8. Kf6 Bd4+ 9. Kf5
               15->   0.05  -0.48   1. Nh4 Bg7 2. Nf3 Bf8 3. e5 Be7 4.
                                    e6 Kg2 5. Nxh2 Kxh2 6. Kg6 Kg3 7. Kf7
                                    Bc5 8. Kf6 Bd4+ 9. Kf5 (s=2)
               16     0.07     +1   1. Nh4!                          
               16     0.08   0.01   1. Nh4 Bg7 2. Nf3 Bf8 3. e5 Be7 4.
                                    e6 Kg2 5. Nxh2 Kxh2 6. Kg6 Ba3 7. Kf6
                                    Bb2+ 8. Kf5 Ba3 9. Kf6
               16->   0.09   0.01   1. Nh4 Bg7 2. Nf3 Bf8 3. e5 Be7 4.
                                    e6 Kg2 5. Nxh2 Kxh2 6. Kg6 Ba3 7. Kf6
                                    Bb2+ 8. Kf5 Ba3 9. Kf6
               17     0.16   0.01   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Bc5 4.
                                    e6 Be7 5. Nxh2 Kxh2 6. Kg6 Ba3 7. Kf6
                                    Bb2+ 8. Kf5 Ba3 9. Kf6 <HT>
               17->   0.16   0.01   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Bc5 4.
                                    e6 Be7 5. Nxh2 Kxh2 6. Kg6 Ba3 7. Kf6
                                    Bb2+ 8. Kf5 Ba3 9. Kf6 <HT>
               18     0.19     +1   1. Nh4!                           
               18     0.20   0.23   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2
               18->   0.22   0.23   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2 (s=3)
               19     0.34   0.47   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2 10. Kd6
                                    (s=2)
               19->   0.36   0.47   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2 10. Kd6
               20     0.41   0.23   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2 10. Kd6
                                    Kd3
               20->   0.46   0.23   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2 10. Kd6
                                    Kd3 (s=3)
               21     0.70   0.07   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2 10. Kd6
                                    Kd3 11. Kc6 (s=2)
               21->   0.77   0.07   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg2 7. Kf7
                                    Kf3 8. e7 Bxe7 9. Kxe7 Ke2 10. Kd6
                                    Kd3 11. Kc6
               22     1.16   0.03   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4
               22->   1.47   0.03   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 (s=2)
               23     2.18   0.07   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kc6
               23->   2.32   0.07   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kc6
               24     4.65     +1   1. Nh4!                           
               24     5.86   1.39   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kb8 Kxb5 13. Kxa7
               24->   5.99   1.39   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kb8 Kxb5 13. Kxa7
               25     6.82   1.39   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kb8 Kxb5 13. Kxa7
               25->   7.16   1.39   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kb8 Kxb5 13. Kxa7
                                    (s=2)
               26    10.14   1.55   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kb8 Kxb5 13. Kxa7
                                    Ka5
               26->  10.68   1.55   1. Nh4 Bd4 2. e5 Bf2 3. Nf3 Kg2 4.
                                    Nxh2 Kxh2 5. e6 Bh4 6. Kg6 Kg3 7. Kf7
                                    Kf4 8. e7 Bxe7 9. Kxe7 Ke5 10. Kd7
                                    Kd5 11. Kc7 Kc4 12. Kb8 Kxb5 13. Kxa7
                                    Ka5
               27    22.85     +1   1. Nh4!                           
               27    27.23     +3   1. Nh4!                           
               27    35.31   3.17   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bb2 5. e6 Ba3 6. Kf6 Kg3 7. e7
                                    Bxe7+ 8. Kxe7 Kf4 9. Kd6 Kf5 10. Kc6
                                    Ke6 11. Kc7 Ke7 12. Kc8 Ke8 13. Kb8
                                    Kd8 14. Ka8 Kc7 15. Kxa7
               27->  36.70   3.17   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bb2 5. e6 Ba3 6. Kf6 Kg3 7. e7
                                    Bxe7+ 8. Kxe7 Kf4 9. Kd6 Kf5 10. Kc6
                                    Ke6 11. Kc7 Ke7 12. Kc8 Ke8 13. Kb8
                                    Kd8 14. Ka8 Kc7 15. Kxa7
               28    37.70     +1   1. Nh4!                           
               28    37.83   3.53   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bb2 5. e6 Ba3 6. Kf6 Kg3 7. e7
                                    Bxe7+ 8. Kxe7 Kf4 9. Kd6 Kf5 10. Kc6
                                    Ke6 11. Kc7 Ke5 12. Kb7 Kd6 13. Kxa7
                                    Kc7 14. Ka8 Kc8 15. Ka7 Kc7 <HT>
               28->  38.22   3.53   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bb2 5. e6 Ba3 6. Kf6 Kg3 7. e7
                                    Bxe7+ 8. Kxe7 Kf4 9. Kd6 Kf5 10. Kc6
                                    Ke6 11. Kc7 Ke5 12. Kb7 Kd6 13. Kxa7
                                    Kc7 14. Ka8 Kc8 15. Ka7 Kc7 <HT> (s=3)
               29    38.65     -1   1. Nh4?                           
               29    40.88     +1   1. Nh4!                           
               29    43.19     +3   1. Nh4!                           
               29    46.03     +M   1. Nh4!                           
               29    48.11   7.02   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bb2 5. e6 Ba3 6. Ke4 Kh3 7. Kd5
                                    Kg4 8. Kc6 Kf5 9. Kb7 Kxe6 10. Kxa7
                                    Kd5 11. Kb7 Kc5 12. a7 Kxb5 13. a8=Q
                                    Bc5 14. Qe8+ Kc4 15. Qe4+ Kb3 16. Kc6
                                    Kc3 17. Qe6 Bd4 18. Qg8 <HT> (s=2)
               29->  49.47   7.02   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bb2 5. e6 Ba3 6. Ke4 Kh3 7. Kd5
                                    Kg4 8. Kc6 Kf5 9. Kb7 Kxe6 10. Kxa7
                                    Kd5 11. Kb7 Kc5 12. a7 Kxb5 13. a8=Q
                                    Bc5 14. Qe8+ Kc4 15. Qe4+ Kb3 16. Kc6
                                    Kc3 17. Qe6 Bd4 18. Qg8 <HT> (s=3)
               30    50.80   7.02   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bxe5 5. Ke6 Kg2 6. Kd7 Bd4 7.
                                    Kc8 Kf3 8. Kb7 Ke4 9. Kxa7 Kd5 10.
                                    Kb7 Kc5 11. a7 Kxb5 12. a8=Q Kb4 13.
                                    Qf8+ Bc5 14. Qf4+ Kc3 15. Qf3+ Kb4
                                    16. Kc6 Bd4 17. Qd3 <HT> (s=2)
               30->  52.81   7.02   1. Nh4 Kg1 2. Nf3+ Kg2 3. Nxh2 Kxh2
                                    4. e5 Bxe5 5. Ke6 Kg2 6. Kd7 Bd4 7.
                                    Kc8 Kf3 8. Kb7 Ke4 9. Kxa7 Kd5 10.
                                    Kb7 Kc5 11. a7 Kxb5 12. a8=Q Kb4 13.
                                    Qf8+ Bc5 14. Qf4+ Kc3 15. Qf3+ Kb4
                                    16. Kc6 Bd4 17. Qd3 <HT> (s=3)
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User avatar
Brunetti
Posts: 424
Joined: Tue Dec 08, 2009 1:37 pm
Location: Milan, Italy
Full name: Alex Brunetti

Re: Test position: surprising shot in the endgame

Post by Brunetti »

Uri Blass wrote:I guess that Fritz also see the point.
Sure Fritz sees it, but not at 00:00:00 as remarked by our friend. I posted the problem from this position because starting from ply 9, as suggested by Louis' post, is too easy for a good engine, I suppose.

Alex
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Uri Blass
Posts: 10820
Joined: Thu Mar 09, 2006 12:37 am
Location: Tel-Aviv Israel

Re: Test position: surprising shot in the endgame

Post by Uri Blass »

Brunetti wrote:
zullil wrote:26 +7.35 00:06 52611k Nh4 Kg1 Nf3+ Kg2 Nxh2 Kxh2 e5 Bxe5 Ke6 Bd4 Kd7
Kg3 Kc6 Kf4 Kb7 Ke4 Kxa7 Kd5 Kb7 Kc5 a7 Kxb5 a8=Q
Kc5 Qd8 Kc4 Qg8+ Kc3 Qd5 Bc5 Kc6 Bd4 Qf5 Bc5 Kd5
Kd2
Good job for Stockfish. The surprising shot is 5.Ke6!! and the Bishop is left there to obstruct Black King's path to c7. 5.Kxe5 only draws.

Alex
The surprise is that there are still strong programs that cannot see Ke6 even some plies later.

New game - Rybka 3 1-cpu 32-bit, 120'/40+60'/20+30'
[d]8/p7/Pp6/1P2bK2/8/8/7k/8 w - - 0 1

Analysis by Fruit 2.1:

5.Kf5xe5
± (0.72) Depth: 1/1 00:00:00
5.Kf5xe5 Kh2-g3
² (0.36) Depth: 2/2 00:00:00
5.Kf5xe5 Kh2-g3 6.Ke5-d4
² (0.36) Depth: 3/3 00:00:00
5.Kf5xe5 Kh2-g3 6.Ke5-e4 Kg3-g4
= (0.24) Depth: 4/4 00:00:00
5.Kf5xe5 Kh2-g3 6.Ke5-e4 Kg3-g4 7.Ke4-d4
= (0.24) Depth: 5/5 00:00:00
5.Kf5xe5 Kh2-g3 6.Ke5-e4 Kg3-g4 7.Ke4-d4 Kg4-f4
= (0.12) Depth: 6/6 00:00:00 1kN
5.Kf5xe5 Kh2-g3 6.Ke5-e4 Kg3-g4 7.Ke4-d4 Kg4-f4 8.Kd4-d5
= (0.12) Depth: 7/7 00:00:00 1kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e3 8.Kc6-b7 Ke3-d4 9.Kb7xa7
+- (1.56) Depth: 8/9 00:00:00 2kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e3 8.Kc6-b7 Ke3-d4 9.Kb7xa7
+- (1.56) Depth: 9/9 00:00:00 3kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e3 8.Kc6-b7 Ke3-d4 9.Kb7xa7 Kd4-c5
+- (1.56) Depth: 10/11 00:00:00 5kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7xa7 Kd6-c7 10.Ka7-a8
+- (1.89) Depth: 11/12 00:00:00 7kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7xa7 Kd6-c7 10.Ka7-a8 Kc7-d6
+- (1.77) Depth: 12/13 00:00:00 9kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7xa7 Kd6-c7 10.Ka7-a8 Kc7-c8 11.a6-a7 Kc8-c7
+- (2.20) Depth: 13/14 00:00:00 12kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-c5 12.Kb7xa7 Kc5xb5
² (0.48) Depth: 14/16 00:00:00 23kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7
+- (1.80) Depth: 15/17 00:00:00 27kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7
+- (1.80) Depth: 16/18 00:00:00 32kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8
+- (1.89) Depth: 17/19 00:00:00 37kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-d6
+- (1.77) Depth: 18/19 00:00:00 144kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
+- (2.20) Depth: 19/22 00:00:00 150kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 20/22 00:00:00 274kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 21/24 00:00:00 281kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 22/24 00:00:00 288kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 23/26 00:00:00 297kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 24/27 00:00:00 305kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 25/28 00:00:00 316kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 26/28 00:00:00 327kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 27/30 00:00:01 338kN
5.Kf5xe5 Kh2-g3 6.Ke5-d5 Kg3-f4 7.Kd5-c6 Kf4-e5 8.Kc6-b7 Ke5-d6 9.Kb7-a8 Kd6-d7 10.Ka8-b8 Kd7-d6 11.Kb8-b7 Kd6-d7 12.Kb7xa7 Kd7-c7 13.Ka7-a8 Kc7-c8 14.a6-a7 Kc8-c7
= (0.00) Depth: 28/30 00:00:01 350kN

(so k, 30.01.2010)

fruit considers Ke6 at depth 28 but does not change the pv to that move

Toga also get stuck in the same depth when it considers Ke6

You can say that maybe fruit and toga are weak programs so I tested Komodo with 256 mbytes hash and it got stuck at depth 33.
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