Author: Paul
Date: 04:48:14 10/07/01
Go up one level in this thread
On October 07, 2001 at 02:09:40, John Merlino wrote: >On October 06, 2001 at 23:07:51, K. Burcham wrote: > >> >>bruce posted a position similiar to this, i modified it for a mate in 11. >>can your program see this mate in 11. >>slate if you read this, will you post your analysis. >> >> >> [D] 7b/q7/Pk3p1P/1Pp2pB1/K1P2P2/1Q6/8/8 w - - 0 1 >> >> >>kburcham > >CM8000 finds a Mate in 13 in a little less than an hour on my PIII-733: > >Time Depth Score Positions Moves >0:00 1/4 4.21 2858 1. Qf3 Qc7 2. Bh4 Ka7 3. Qd5 >0:00 2/5 4.63 16232 1. Qf3 Qc7 2. Bh4 Qd7 3. Bf2 Qc8 > 4. Qb7+ Qxb7 5. axb7 Kxb7 6. Bxc5 >0:01 2/6 4.80 42505 1. Qf3 Qd7 2. Bh4 Ka7 3. Bf2 Kb6 > 4. Qa8 Qd1+ 5. Ka3 Qa1+ 6. Kb3 >0:02 3/7 4.63 101647 1. Qf3 Qd7 2. Bh4 Ka7 3. Bf2 Kb6 > 4. Qb7+ Qxb7 5. axb7 Kxb7 6. Bxc5 >0:02 3/7 5.61 143859 1. Qd3 Qe7 2. Bh4 Qc7 3. Qxf5 Qf7 > 4. Qd5 Qe7 5. Qa8 >0:04 4/8 6.27 397376 1. Qd3 Qe7 2. Bh4 Kc7 3. Qd5 Qe4 > 4. Qxc5+ Kd7 5. Qd5+ Ke7 6. Qxe4+ > fxe4 >0:12 4/8 9.42 1168177 1. Qc3 Qd7 2. Bxf6 Ka7 3. Bxh8 > Qd1+ 4. Ka3 Kb6 5. h7 Qe2 6. Be5 >0:16 5/9 9.46 1653617 1. Qc3 Qd7 2. Bxf6 Ka7 3. Bxh8 > Qd1+ 4. Ka3 Kb6 5. h7 Qd6 6. Be5 >0:40 6/10 10.31 4509849 1. Qc3 Qd7 2. Bxf6 Ka7 3. Bxh8 > Qd1+ 4. Ka3 Ka8 5. Be5 Qd7 6. Bd6 > Ka7 7. Bxc5+ Kb8 >1:21 6/10 14.94 9642001 1. Qd3 Qc7 2. Bh4 Ka7 3. Bf2 Kb8 > 4. Bxc5 Qxc5 5. Qd8+ Qc8 6. a7+ > Kb7 7. Qxc8+ Kxc8 8. a8=Q+ Kc7 > 9. Qxh8 >4:08 7/11 17.22 30748147 1. Qd3 Qe7 2. Bh4 Ka7 3. Qd5 Qc7 > 4. Bf2 Kb8 5. Qg8+ Qc8 6. a7+ Kb7 > 7. Qxc8+ Kxc8 8. a8=Q+ Kc7 9. Qxh8 >8:44 8/12 18.26 63137709 1. Qd3 Qe7 2. Bh4 Ka7 3. Qd5 Qc7 > 4. Bf2 Kb8 5. Qg8+ Qc8 6. a7+ Kb7 > 7. Qxc8+ Kxc8 8. a8=Q+ Kc7 9. Qxh8 > Kd7 10. Qg7+ Ke6 11. Bxc5 >57:44 9/13 Mate13 432175230 1. Qd3 Qe7 2. Bh4 Kc7 3. a7 Qe8 > 4. Qd5 Qd7 5. Qxd7+ Kxd7 6. a8=Q > Kc7 7. Qc6+ Kd8 8. Bxf6+ Bxf6 9. > Qxf6+ Kc7 10. h7 Kb7 11. Qc6+ Ka7 > 12. Qc7+ Ka8 13. h8=Q# > >However, I have a suspicion that it's actually a Mate in 12. The improving move >that the above is missing 4.Ka5. If I force 1.Qd3 Qe7 2.Bh4 Kc7 3.a7 Qe8, then I >get: > >Time Depth Score Positions Moves >0:00 2/5 15.50 14900 4. Qd5 Qe4 5. Qxe4 fxe4 6. a8=Q > e3 7. Qxh8 >0:00 2/6 16.31 52634 4. Qd5 Qe4 5. Qc6+ Qxc6 6. bxc6 > Kxc6 7. a8=Q+ Kc7 8. Qxh8 Kd7 9. > Qxf6 >0:02 3/7 17.44 215703 4. Qd5 Qe4 5. Qxc5+ Kd8 6. Qd5+ > Qxd5 7. cxd5 Kc7 8. a8=Q Kd6 9. > Qd8+ Kc5 10. Bf2+ Kc4 11. Qxh8 > Kxd5 12. Qxf6 >0:05 3/7 24.76 629456 4. Ka5 Qe4 5. b6+ Kc8 6. Qd6 Qb7 > 7. Qf8+ Kd7 8. Qf7+ Kd6 9. Qxb7 > Ke6 10. Qd5+ Ke7 11. Qxc5+ Ke6 > 12. Qd5+ Ke7 13. a8=Q >0:07 4/8 Mate09 843073 4. Ka5 Qe4 5. b6+ Kc8 6. Qd6 Qb7 > 7. Qf8+ Kd7 8. Qf7+ Kd6 9. Qxb7 > Ke6 10. a8=Q Kd6 11. Qc7+ Ke6 12. > Qac6# >0:21 5/9 Mate09 2663784 4. Ka5 Qa8 5. b6+ Kc8 6. Qd6 Qb7 > 7. Qf8+ Kd7 8. Qf7+ Kd6 9. Qxb7 > Ke6 10. a8=Q Kd6 11. Qc7+ Ke6 12. > Qac6# >0:41 6/10 Mate09 5212517 4. Ka5 Qa8 5. b6+ Kc8 6. Qd6 Qb7 > 7. Qf8+ Kd7 8. Qf7+ Kd6 9. Qxb7 > Ke6 10. a8=Q Kd6 11. Qc7+ Ke6 12. > Qd5# > >Notice that the mating move is White's 12th move. Is there something better in >the first three moves that I'm missing? > >jm Hi John, Just ran the magnificent Chest of Heiner Marxen on this and it says it's a mate in 11 alright: Bh4 Qd7 Qf3 Ka7 Bf2 Kb6 Ka3 Qc8 Qd5 Kc7 Be1 Bg7 Ba5+ Kb8 hxg7 Ka7 Qf7+ Qc7 Qxc7+ Ka8 g8=Q# There are 3 possible keymoves: Bh4, Qd3 or Qf3. I don't have the line for Qd3 unfortunately, my own program is still in deep thought on Qd3, stuck at a 19.92 score at the moment ... yep, Chest won this race! :) Oh, and other programs probably have a hard time with this because check extensions don't work very well here. Groetjes, Paul
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