Author: Dann Corbit
Date: 14:57:47 03/07/01
Go up one level in this thread
On March 07, 2001 at 13:59:17, Sune Larsson wrote:
>
> [D]8/5pP1/1R6/7P/8/k7/p6r/K7 w - - 0 5
>
> After Mozes,L 1975
>
> This is a rook ending with 2 vs 2 pawns. White is in huge trouble.
> True he has two alert passers but he is facing an acute mate threat
> on the first rank. The draw is there with 1.Ra6+ Kb3 2.Rb6+ etc. but
> is there way to play for win without committing suicide?
> After 10 minutes Fritz shows 0.00. War or peace?
>
>
> Test: 1) White to move and play for a win. Find the + evals!
>
> 2) According to Mr Mozes it's white to move and win.
> Is this true? Some positions with KQ - KRP might
> easily happen. This is for people who have all the 5 men TB:s.
> The original solution further down.
>
>
> Sune
>
>
>
>
>
>
>
>Mozes,L
>1975
>
>1.Rb1 axb1Q+ 2.Kxb1 Kb3 3.Kc1 Kc3 4.Kd1 Kd3 5.Ke1 Ke3 6.Kf1 Kf3 7.g8Q Rh1+ 8.Qg1
>Rxg1+ 9.Kxg1 Kg4 10.h6 1-0
>
>What about all the 5 men endings if black takes the h-pawn somewhere?
>Are they all won for white?
After further review, I would say that this one needs further review.
;-)
I would not even begin to trust computer output on this one until it has ran all
night.
White(1): go
end-game phase
clearing hash tables
time surplus 0.00 time limit 16:39 (16:39)
nss depth time score variation (1)
11 1.49 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
11-> 2.85 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
12 3.86 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
12-> 4.62 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
13 5.94 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
13-> 6.70 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
14 9.90 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
14-> 11.75 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
15 17.37 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
15-> 19.23 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
16 32.15 0.00 1. Ra6+ Kb3 2. Rb6+ Ka3
16 1:18 0.36 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Kc3
4. Kd1 Rg2 5. h6 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Ra1+ 10. Kh2
Ra2+ 11. Kh3
16-> 1:18 0.36 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Kc3
4. Kd1 Rg2 5. h6 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Ra1+ 10. Kh2
Ra2+ 11. Kh3
17 1:42 ++ 1. Rb1!!
17 6:34 4.67 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Rg2
4. h6 Kc3 5. Kd1 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Rg2+ 10. Kh1
Rxg7 11. h8=Q
17-> 6:50 4.67 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Rg2
4. h6 Kc3 5. Kd1 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Rg2+ 10. Kh1
Rxg7 11. h8=Q
18 6:50 -- 1. Rb1
18 7:38 4.17 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Rg2
4. h6 Kc3 5. Kd1 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Rg2+ 10. Kh1
Rxg7 11. h8=Q Rg2
18-> 8:22 4.17 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Rg2
4. h6 Kc3 5. Kd1 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Rg2+ 10. Kh1
Rxg7 11. h8=Q Rg2
19 8:22 -- 1. Rb1
19 9:17 0.59 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Rg2
4. h6 Kc3 5. Kd1 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Ra1+ 10. Kh2
Ra2+ 11. Kh3 Ra1 12. Kh4 Rh1+ 13. Kg5
Rg1+ 14. Kf5
19-> 14:13 0.59 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 Rg2
4. h6 Kc3 5. Kd1 Kd3 6. Ke1 Ke3 7.
Kf1 Kf3 8. h7 Ra2 9. Kg1 Ra1+ 10. Kh2
Ra2+ 11. Kh3 Ra1 12. Kh4 Rh1+ 13. Kg5
Rg1+ 14. Kf5
time=16:39 cpu=99% mat=0 n=502407477 fh=89% nps=502895
ext-> chk=46092315 cap=0 pp=1601116 1rep=1432891 mate=162858
predicted=0 nodes=502407477 evals=107217237
endgame tablebase-> probes done=1219482 successful=520542
White(1): Rb1
time used: 16:39
Black(1): axb1=Q+ [pondering]
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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