Author: Robert Hyatt
Date: 10:19:32 05/02/02
Go up one level in this thread
On May 02, 2002 at 12:06:32, Ron Murawski wrote:
>On May 02, 2002 at 11:40:57, Robert Hyatt wrote:
>
>>On May 02, 2002 at 11:22:14, Ron Murawski wrote:
>>
>>>Hi all,
>>>
>>>This one is not too tough, but some engines don't see it.
>>>
>>>[D] 2b1r3/6kn/1q1p1pp1/1pnPb2p/r1pBP2P/2P3N1/P2QNRP1/1B3R1K w - - 0 43
>>>
>>>bm: Nxh5+
>>>
>>>This was from a game, it was Horizon's 43rd move.
>>>
>>>[Event "Computer chess game"]
>>>[Site "JUBBY"]
>>>[Date "2002.05.02"]
>>>[Round "1"]
>>>[White "Horizon"]
>>>[Black "Quark v1.50"]
>>>[Result "1-0"]
>>>[TimeControl "40/900"]
>>>
>>>1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8.
>>>c3 O-O 9. h3 h6 10. d4 Re8 11. Nbd2 Bf8 12. Nf1 Bb7 13. Ng3 Na5 14. Bc2 Nc4
>>>15. Bd3 c5 16. d5 Nb6 17. Be3 c4 18. Bc2 Qc7 19. Nh4 g6 20. Qd2 Kh7 21. Kf1
>>>Bg7 22. f4 exf4 23. Bxf4 Nfd7 24. Nf3 a5 25. Nd4 Ba6 26. Nc6 Na4 27. Rab1
>>>Nac5 28. Kg1 Bb7 29. Nd4 Qb6 30. Be3 Be5 31. Bf2 Nf6 32. Nde2 a4 33. Rf1
>>>Kg7 34. Rbe1 a3 35. bxa3 Rxa3 36. Bb1 Ra4 37. Bd4 Rh8 38. Rf3 Nh7 39. Ref1
>>>f6 40. R3f2 Re8 41. Kh1 h5 42. h4 Bc8 43. Nxh5+ gxh5 44. Rxf6 Nxf6 45. Qg5+
>>>Kh7 46. Rxf6 Bxf6 47. Bxf6 Re7 48. Qxh5+ Kg8 49. Qh8+ Kf7 50. Qg7+ Ke8 51.
>>>Qxe7#
>>>{White Mates} 1-0
>>>
>>>Ron
>>
>>
>>This isn't a "king safety" position. It is a pure tactical position:
>>
>> 9 1.18 0.19 43. Bxe5 Rxe5 44. Nd4 Bd7 45. Qf4 Qc7
>> 46. Kg1 Re7 47. Rf3 Kg8
>> 9 6.12 ++ 43. Nxh5+!!
>> 9 9.40 3.10 43. Nxh5+ gxh5 44. Rxf6 Bxf6 45. Rxf6
>> Nxf6 46. Qg5+ Kh7 47. e5+ Nd3 48. Bxb6
>> Nxd5 49. Qxh5+
>> 9-> 9.40 3.10 43. Nxh5+ gxh5 44. Rxf6 Bxf6 45. Rxf6
>> Nxf6 46. Qg5+ Kh7 47. e5+ Nd3 48. Bxb6
>> Nxd5 49. Qxh5+
>> 10 14.68 ++ 43. Nxh5+!!
>> 10 27.20 4.34 43. Nxh5+ gxh5 44. Rxf6 Bxf6 45. Bxf6+
>> Kg6 46. e5+ Nd3 47. Bxd3+ cxd3 48.
>> Qxd3+ Kh6 49. Bg5+ Nxg5 50. Rf6+ Kg7
>> 51. Qg6+ Kh8 52. Qxe8+ Kg7 53. Qg6+
>> Kh8 54. Qxg5
>> 10-> 27.35 4.34 43. Nxh5+ gxh5 44. Rxf6 Bxf6 45. Bxf6+
>> Kg6 46. e5+ Nd3 47. Bxd3+ cxd3 48.
>> Qxd3+ Kh6 49. Bg5+ Nxg5 50. Rf6+ Kg7
>> 51. Qg6+ Kh8 52. Qxe8+ Kg7 53. Qg6+
>> Kh8 54. Qxg5
>
>
>Bob,
>
>Maybe I don't understand the meaning of "king safety"? I thought it meant king
>mating threats. No???
Not in the context I normally see this term used in. "tactics" is what happens
when you shuffle pieces and win material. That is what this one is about. King
safety usually means there is no win or loss of material, but you have a move
that does something to affect king safety. IE if a program allows black to play
Bxf3 and white has to play gxf3, then white's king is somewhat exposed on the
g-file. No material has been won, no mate has been seen, but the king position
is "weaker" than before. Or things like black playing Bxh2 followed by white
playing g3 and black goes for Bxg3 fxg3 Qxg3 with a piece for three pawns
(bad) but a horribly open white kingside (good). King safety is about making
such "knowldege" judgements rather than just a forced sequence of moves that
any search will see...
>
>How does a "pure tactical" mate-threat position differ from a "king safety"
>position?
You could remove the static evaluation software totally and just have a
material-only evaluation and yet the program would still find the tactical
answer because it is _only_ about winning material. King safety is generally
a positional (non-material) consideration...
>
>BTW, is it possible that this position is a test of move extensions while in
>check?
That too... that is a part of "tactics"...
>
>Ron
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