"avoid move" positions

[jdart]

A couple of these, from recent Arasan games:

[d] 8/7p/1p4p1/3P1n2/BK5k/2p2P1P/6p1/4R3 b - -

am Kxh3

[d] 4N3/5k2/P5p1/4p2p/3pPqp1/8/5PnP/R4R1K w - -

am Kxg2

[Eelco de Groot]

Here is another position, in which Toga was outsearched today by Rybka and Toga Checkov 2k7 made the fatal mistake 24.Qxa7??


3n1rk1/pp3q1p/4bp2/2P1n3/QP2BB2/P5Pp/4PP1P/3R2K1 w - - bm 24.b5; id "Toga - Rybka, difficult for Toga";
[d]3n1rk1/pp3q1p/4bp2/2P1n3/QP2BB2/P5Pp/4PP1P/3R2K1 w - - am 24.Qxa7; id "Toga - Rybka, fatal for Toga but probably not very difficult";



[Event "6 minuten per partij + 6 seconden per zet"]
[Site "Engine Match"]
[Date "2007.06.12"]
[Round "1"]
[White "Toga 1.3 \"Checkov\" 2k7"]
[Black "Rybka 1.0 Beta 32-bit"]
[Result "0-1"]

1. c4 {Boek 0s} e5 {Boek 0s} 2. Nc3 {Boek 0s} Nf6 {Boek 0s}
3. Nf3 {Boek 0s} Nc6 {Boek 0s} 4. g3 {Boek 0s} Bb4 {Boek
0s} 5. Nd5 {Boek 0s} e4 {Boek 0s} 6. Nh4 {Boek 0s} Bc5
{Boek 0s} 7. Bg2 {Boek 0s} d6 {Boek 0s} 8. O-O {Boek 0s} g5
{Boek 0s} 9. d4 {Boek 0s} Nxd5 {Boek 0s} 10. dxc5 {+0.10/14
20s} Ndb4 {+0.34/13 38s} 11. a3 {+0.54/13 26s} Na6
{-0.04/13 17s} 12. cxd6 {+0.41/12 13s} gxh4 {+0.36/10 8s}
13. b4 {+0.48/12 15s} h3 {+0.04/11 17s} 14. Bh1 {+1.01/14
18s} Nab8 {-0.14/12 18s} 15. dxc7 {+1.19/13 17s} Qxc7
{+0.05/11 3s} 16. Bf4 {+1.21/14 19s} Ne5 {+0.27/12 20s}
17. Bxe4 {+1.07/13 12s} Nbc6 {+0.14/11 21s} 18. Qc2
{+1.17/12 23s} Be6 {+0.27/11 10s} 19. Rad1 {+0.68/12 22s}
f6 {+0.25/11 12s} 20. c5 {+0.81/12 11s} Rd8 {+0.20/11 19s}
21. Rxd8+ {+0.85/12 17s} Nxd8 {+0.26/12 12s} 22. Rd1
{+0.81/13 17s} O-O {+0.43/11 15s} 23. Qa4 {+0.66/13 14s}
Qf7 {+0.59/12 13s} 24. Qxa7 {+0.17/13 9s} Bb3 {+2.01/13
14s} 25. Rd6 {-0.39/14 17s} Ndc6 {+1.94/13 16s} 26. Qb6
{-0.63/14 10s} Nc4 {+2.22/13 18s} 27. Qb5 {-0.83/14 8s}
Nxd6 {+2.05/13 9s} 28. cxd6 {-0.98/14 13s} Ra8 {+2.66/13
24s} 29. Bc1 {-0.99/14 13s} Qc4 {+3.45/13 14s} 30. Qxc4+
{-1.83/14 12s} Bxc4 {+3.60/14 5s} 31. Kf1 {-1.86/15 10s}
Rd8 {+3.65/15 21s} 32. Bf4 {-1.90/17 10s} Nd4 {+3.71/15 8s}
33. Bxb7 {-1.92/17 9s} Kg7 {+3.71/15 17s} 34. Ke1 {-2.12/17
9s} Nxe2 {+3.99/15 9s} 35. Bd5 {-2.23/17 7s} Bd3 {+4.26/15
9s} 36. Be3 {-2.53/17 11s} Rxd6 {+4.26/14 2s} 37. Bf3
{-2.87/17 11s} Nd4 {+4.33/12 3s} 38. Bxd4 {-2.52/17 10s}
Rxd4 {+4.33/14 6s} 39. Bd1 {-2.62/17 8s} h6 {+4.33/13 23s}
40. Ba4 {-2.63/16 15s} f5 {+4.34/13 12s} 41. Bd1 {-2.94/17
11s} f4 {+4.36/12 17s} 42. g4 {-3.24/16 9s} Kf6 {+4.34/11
6s} 43. f3 {-4.16/17 13s} h5 {+4.55/12 10s} 44. gxh5
{-4.16/18 16s} Rd5 {+4.42/13 6s} 45. h6 {-3.93/16 1:18m}
Rg5 {+5.76/16 8s} 46. Kd2 {-7.03/17 7s} Rg2+ {+10.92/16
1:03m} 47. Kxd3 {-8.66/16 1:00m} Rxh2 {+11.77/16 49s} 0-1

[Eelco de Groot]

Here is another position, in which Toga was outsearched today by Rybka and Toga Checkov 2k7 made the fatal mistake 24.Qxa7??


3n1rk1/pp3q1p/4bp2/2P1n3/QP2BB2/P5Pp/4PP1P/3R2K1 w - - bm 24.b5; id "Toga - Rybka, difficult for Toga";

Sorry, this BM position is not correct, I believe that should have been the position where Toga plays 23.Qa4 but that one is not very interesting as I think not many other programs will play it. I hope. Toga Checkov 2k does not show 23. Qa4 in analysis mode. 23. b5 is better But taking the pawn on a7 one move later is fatal and Rybka's eval immediately goes up to two pawns. These 2k7 settings could not avoid it but Toga Chekov 2k is a bit faster

Eelco