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Subject: Re: Easy for humans

Author: Uri Blass

Date: 02:43:22 02/17/02

Go up one level in this thread

On February 17, 2002 at 05:21:47, Ed Schröder wrote:

>On February 17, 2002 at 04:55:13, Steffen Jakob wrote:
>
>>Here is another position which is easy to solve for humans. In a blitz game
>>between Hossa and Arasan the following position was on the board:
>>
>>[D]8/8/4B2p/2K5/r5P1/p5k1/Rb6/8 b - - 7 116
>>
>>For humans it's rather easy to see that 117... Rxg4 wins without any problems
>>because the white rook is totally paralyzed. Unfortunately Hossa wasn't able to
>>see this in the blitz game. So the game continued until the 50 moves rule forced
>>Hossa to take the bishop and finally to win the game.
>>Which engines find 117... Rxg4 in which time?
>
>Easy for comps too :)
>
>2 secs for RC4
>
>Ed
>
>==============================================================
>
>00:00:02.1	1,88	9	449751	Re4 Kd6 Re3 Bf5 Kf4 Be6 Re5 Bd7
>00:00:02.1	1,88	9	817955	Rxg4
>00:00:02.1	2,09	9	835992	Rxg4 Bxg4 Kxg4 Kd5 h5 Kd6 h4 Kd5
>00:00:03.3	2,17	10	1122788	Rxg4 Bxg4 Kxg4 Kd5 h5 Ke4 h4 Ke3
>00:00:04.5	2,01	11	2027319	Rxg4 Bxg4 Kxg4 Kc4 h5 Kd3 Kf3 Kc4
>00:00:34.6	3,62	12	31107270	Rxg4 Bd7 h5 Bc6 Rf4 Kb5 h4 Ka5
>00:00:44.1	3,82	13	41624594	Rxg4 Bd7 h5 Bc6 Rf4 Bb5


Trivial for Deep Fritz

It knows that opposite color bishops with one pawn advantage gives good chances
for a draw so it's only choice is to sacrifice the rook by evaluation.

It changes it's mind during the search to Rxe4 but you can see from the main
line that it plans the sacrifice.


New position
8/8/4B2p/2K5/r5P1/p5k1/Rb6/8 b - - 0 1

Analysis by Deep Fritz:

1...Rxg4!
  -+  (-2.19)   Depth: 1/4   00:00:00
1...Rxg4!
  -+  (-2.75)   Depth: 1/4   00:00:00
1...Rxg4 2.Bxg4 Kxg4
  -+  (-2.78)   Depth: 2/5   00:00:00
1...Rxg4 2.Bxg4 Kxg4
  -+  (-2.78)   Depth: 3/8   00:00:00
1...Rxg4 2.Bxg4 Kxg4 3.Kd5
  -+  (-2.75)   Depth: 4/8   00:00:00
1...Rxg4 2.Bxg4 Kxg4 3.Kd5 h5
  -+  (-2.88)   Depth: 5/13   00:00:00  4kN
1...Rxg4 2.Bxg4 Kxg4 3.Kd5 h5 4.Ke4
  -+  (-2.91)   Depth: 6/10   00:00:00  7kN
1...Rxg4 2.Bxg4 Kxg4 3.Kd5 h5 4.Ke4 h4
  -+  (-3.16)   Depth: 7/15   00:00:00  20kN
1...Rxg4--
  -+  (-2.84)   Depth: 8/13   00:00:00  38kN
1...Rxg4--
  -+  (-2.84)   Depth: 8/13   00:00:00  40kN
1...Re4!
  -+  (-2.88)   Depth: 8/19   00:00:00  81kN
1...Re4! 2.Bf7 Rxg4 3.Kd6 Rg5 4.Bd5 h5 5.Ke6 Re5+ 6.Kd6
  -+  (-3.09)   Depth: 8/19   00:00:00  113kN
1...Re4 2.Kd5 Rxe6 3.Kxe6 Kxg4 4.Kd5 h5 5.Ke4 Kg3
  -+  (-2.84)   Depth: 9/18   00:00:00  188kN
1...Rxg4!
  -+  (-2.88)   Depth: 9/18   00:00:00  190kN
1...Rxg4! 2.Bxg4 Kxg4 3.Kd5 Kf4 4.Kc4 h5 5.Kd3 h4
  -+  (-3.28)   Depth: 9/21   00:00:00  233kN
1...Rxg4 2.Bxg4 Kxg4 3.Kc4 h5 4.Kd3 h4 5.Ke4 Kg3 6.Kd3
  -+  (-3.22)   Depth: 10/16   00:00:00  341kN
1...Rxg4!
  -+  (-3.53)   Depth: 11/18   00:00:01  678kN, tb=1
1...Rxg4 2.Bxg4 Kxg4 3.Kd5 Kf4 4.Kc5 h5 5.Kd5 h4 6.Kd6 h3 7.Kd5
  -+  (-3.69)   Depth: 12/20   00:00:02  1453kN, tb=1
1...Rxg4!
  -+  (-4.00)   Depth: 13/22   00:00:05  3420kN, tb=1
1...Rxg4--
  -+  (-3.69)   Depth: 14/20   00:00:12  7607kN, tb=3
1...Rxg4-- 2.Bxg4 Kxg4 3.Kc4 h5 4.Kd3 Kf3 5.Kd2 h4
  -+  (-3.66)   Depth: 14/22   00:00:12  7776kN, tb=3
1...Rxg4!
  -+  (-3.97)   Depth: 15/27   00:00:37  24490kN, tb=32

(Blass, Tel-aviv 17.02.2002)

Uri

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