Author: Sune Larsson
Date: 12:46:39 03/07/01
Go up one level in this thread
On March 07, 2001 at 15:35:37, John Merlino wrote: >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? > >No problem for CM8000, as it sees the answer in 2:52 on a P3-600: > >Time Depth Score Positions Moves >0:00 4/5 0.00 5029 1. Ra6+ Kb3 2. Rb6+ Ka3 >0:00 6/7 0.00 38870 1. Ra6+ Kb3 2. Rb6+ Ka3 >0:01 7/8 0.00 96594 1. Ra6+ Kb3 2. Rb6+ Ka3 >0:02 8/9 0.00 253904 1. Ra6+ Kb3 2. Rb6+ Ka3 >0:07 9/10 0.00 686900 1. Ra6+ Kb3 2. Rb6+ Ka3 >0:17 10/11 0.00 1733359 1. Ra6+ Kb3 2. Rb6+ Ka3 >2:52 10/11 1.36 17416616 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 > Kc3 4. Kd1 Kd3 5. Ke1 Ke3 6. Kf1 > Rxh5 7. g8=Q f5 >6:30 11/12 1.30 38386917 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 > Kc3 4. Kd1 Kd3 5. Ke1 Ke3 6. Kf1 > Rxh5 7. g8=Q Rf5+ 8. Ke1 Ke4 >19:52 12/13 1.41 114787819 1. Rb1 axb1=Q+ 2. Kxb1 Kb3 3. Kc1 > Kc3 4. Kd1 Kd3 5. Ke1 Ke3 6. Kf1 > Rxh5 7. g8=Q Rf5+ 8. Ke1 Ke4 9. > Qg4+ Rf4 > >jm Impressive that CM chooses 1.Rb1+ that quick. Maybe it has something to do with lack of TB:s?! The last variation above is one of them 5 men endings I was talking about. Wonder if that position really is a win for white. The author of the study obviously believed so. Sune
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