Weird game

[Jouni]

In endgame match Critter - Rybka happened:

[Event "NET"]
[Site "?"]
[Date "2010.12.10"]
[Round "8"]
[White "Deep Rybka 4 x64"]
[Black "Critter 0.90 64-bit"]
[Result "0-1"]
[Annotator "-0.57;-1.57"]
[SetUp "1"]
[FEN "8/p1p1k3/1p1p1qp1/3P3p/2P1P3/1P3QPK/P7/8 b - - 0 1"]
[PlyCount "17"]
[TimeControl "40/600:40/600:40/600"]

{Pentium(R) Dual-Core CPU E5300 @ 2.60GHz 0 MHz W=16.6 ply; 193kN/s;
55 TBAs B=39.6 ply; 4 171kN/s; 3 339 TBAs} 1... Qe5 {Both last book move} 2.
Kh4 {-0.57/18 39} Qf6+ {(a6) -1.57/20 15} 3. Kh3 {(Qxf6+) 0.00/24 16} Qxf3 {
-87.57/15 2} 4. Kh2 {-#6/12 19} Kf6 {-#6/20 13} 5. a4 {(c5) -#5/14 15} Kg5 {
-#5/41 10} 6. c5 {(Kg1) -#4/14 14} Kg4 {-#4/56 2} 7. cxd6 {-#3/15 13} Qf2+ {
-#3/56 0} 8. Kh1 {-#2/13 0} Kxg3 {-#2/56 0} 9. dxc7 {-#1/17 8} Qg2# {-#1/56 0}
0-1

Move Kh3?? with score 0.00 is caused by repetition detection I quess. Is there anything to do or does this happen to all engines?

Jouni

[OliverUwira]

In endgame match Critter - Rybka happened:

[Event "NET"]
[Site "?"]
[Date "2010.12.10"]
[Round "8"]
[White "Deep Rybka 4 x64"]
[Black "Critter 0.90 64-bit"]
[Result "0-1"]
[Annotator "-0.57;-1.57"]
[SetUp "1"]
[FEN "8/p1p1k3/1p1p1qp1/3P3p/2P1P3/1P3QPK/P7/8 b - - 0 1"]
[PlyCount "17"]
[TimeControl "40/600:40/600:40/600"]

{Pentium(R) Dual-Core CPU E5300 @ 2.60GHz 0 MHz W=16.6 ply; 193kN/s;
55 TBAs B=39.6 ply; 4 171kN/s; 3 339 TBAs} 1... Qe5 {Both last book move} 2.
Kh4 {-0.57/18 39} Qf6+ {(a6) -1.57/20 15} 3. Kh3 {(Qxf6+) 0.00/24 16} Qxf3 {
-87.57/15 2} 4. Kh2 {-#6/12 19} Kf6 {-#6/20 13} 5. a4 {(c5) -#5/14 15} Kg5 {
-#5/41 10} 6. c5 {(Kg1) -#4/14 14} Kg4 {-#4/56 2} 7. cxd6 {-#3/15 13} Qf2+ {
-#3/56 0} 8. Kh1 {-#2/13 0} Kxg3 {-#2/56 0} 9. dxc7 {-#1/17 8} Qg2# {-#1/56 0}
0-1

Move Kh3?? with score 0.00 is caused by repetition detection I quess. Is there anything to do or does this happen to all engines?

Jouni

Damn, Kurt blunders the queen the same way... and it must be a really huge bug. Look at the PV at depth 6 and 7 and from depth 18 on

I'm stunned.

Code: Select all

FEN: 8/p1p1k3/1p1p2p1/3Pq2p/2P1P3/1P3QPK/P7/8 w - - 1 2 

Kurt 0.9.3 x64:
   1	00:00	          43	1	-0,06	b3b4
   2	00:00	         370	1	+0,07	Df3f4 De5a1
   3	00:00	         660	1	+0,08	Df3f4 De5a1 Df4g5+
   4	00:00	         978	1	+0,08	Df3f4 De5a1 Df4g5+ Ke7f7
   5	00:00	       2.401	160.067	+0,10	Df3f4 De5a1 Df4g5+ Da1f6 Dg5e3
   6	00:00	      34.704	738.383	 0,00	Kh3h4 De5f6+ Kh4h3 Ke7xf6 b3b4+ Kf6e5
   7	00:00	      62.818	805.359	 0,00	Kh3h4 De5f6+ Kh4h3
   8	00:00	      97.923	898.376	+0,06	Kh3h4 Ke7e8 Df3e3 De5e7+ Kh4h3 De7d7+ Kh3g2 c7c5
   9	00:00	     113.445	810.321	+0,08	Kh3h4 Ke7e8 Df3e3 De5e7+ Kh4h3 De7e5 De3f4 De5a1 Df4d2
  10	00:00	     155.765	832.968	+0,02	Kh3h4 De5f6+ Df3xf6+ Ke7xf6 a2a3 a7a6 b3b4 b6b5 c4xb5 a6xb5
  11	00:00	     256.173	865.449	+0,01	Kh3h4 De5f6+ Df3xf6+ Ke7xf6 a2a3 a7a6 b3b4 b6b5 c4xb5 a6xb5 Kh4h3
  12	00:00	     526.920	888.567	 0,00	Kh3h4 a7a5 Df3e3 De5a1 a2a4 Da1b2 Kh4h3 Ke7d7 De3f3 Kd7e7 Df3e3 Db2f2
  13	00:00	     622.409	886.623	 0,00	Kh3h4 a7a5 Df3e3 De5a1 a2a4 Da1b2 Kh4h3 Ke7d7 De3f3 Kd7e7 Df3e3
  14	00:01	     812.878	914.373	 0,00	Kh3h4 a7a5 Df3e3 De5a1 a2a4 Da1b2 Kh4h3 Ke7d7 De3f3 Kd7e7 Df3e3
  15	00:01	   1.172.390	928.258	 0,00	Kh3h4 a7a5 Df3e3 De5a1 a2a4 Da1b2 Kh4h3 Ke7d7 De3f3 Kd7e7 Df3e3
  16	00:01	   1.646.074	933.678	 0,00	Kh3h4 a7a5 Df3e3 De5a1 a2a4 Da1b2 Kh4h3 Ke7d7 De3f3 Kd7e7 Df3e3
  17	00:02	   2.350.128	935.933	 0,00	Kh3h4 a7a5 Df3e3 De5a1 a2a4 Da1b2 Kh4h3 Ke7d7 De3f3 Kd7e7 Df3e3
  18	00:05	   5.267.352	943.125	 0,00	Kh3h4 De5f6+ Kh4h3 Ke7xf6 a2a3+ a7a6 a3a4+ a6a5 g3g4+ h5xg4+ Kf6g7+ g4g5 Kg7h7 g5f6 Kh7h6 e4e5 g6g5
  19	00:06	   6.046.388	940.779	 0,00	Kh3h4 De5f6+ Kh4h3 Ke7xf6 a2a3+ a7a6 a3a4+ a6a5 g3g4+ h5xg4+ Kf6g7+ g4g5 Kg7h7 g5f6 Kh7h6 e4e5 g6g5
  20	00:07	   7.266.997	937.314	 0,00	Kh3h4 De5f6+ Kh4h3 Ke7xf6 a2a3+ a7a6 a3a4+ a6a5 g3g4+ h5xg4+ Kf6g7+ g4g5 Kg7h7 g5f6 Kh7h6 e4e5 g6g5

But are you sure you gave the correct FEN? Black could have taken the queen right at move 1? What kind of book has a line that doesn't win the queen when it can?

[Jouni]

This position is from Nunn Endgame Test. Because I test in Chessbase GUI You need one move before start position. May be ...Qe5 is not the wisest move, but it reveals nicely repetition feature! Some engines NOT playing Kh3 are Critter and Spark.

Jouni