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Subject: Re: hard position ....

Author: F. Huber

Date: 09:57:34 03/27/05

On March 26, 2005 at 17:28:07, Mike Byrne wrote:

>White(1): [d]2r1k2r/1p2np2/q3p1p1/b2pPnN1/3p1P2/PR3N2/2P3QP/R1B4K b k - 0 1
...
>in case you're wondering
>
>Rxc2 Qxc2 leads to mate ...
>
>White(2): Qxc2
>              time used:   2:08
>              time surplus   0.00  time limit 100:00 (100:00)
>              depth   time  score   variation (1)
>               13     9.39  -5.96   2. ... Ng3+ 3. Kg2 Qf1+ 4. Kxg3 Nf5+
>                                    5. Qxf5 Be1+ 6. Nxe1 Qxe1+ 7. Kg2 Qe2+
>                                    8. Kg3 Qxh2+ 9. Kf3 Qh1+ 10. Kg3 Qg1+
>                                    11. Kf3 gxf5 12. Nh7 Qd1+ 13. Kg2 Qc2+
>                                    14. Kg1 Rg8+ 15. Ng5 Qxb3
>               13->  15.86  -5.96   2. ... Ng3+ 3. Kg2 Qf1+ 4. Kxg3 Nf5+
>                                    5. Qxf5 Be1+ 6. Nxe1 Qxe1+ 7. Kg2 Qe2+
>                                    8. Kg3 Qxh2+ 9. Kf3 Qh1+ 10. Kg3 Qg1+
>                                    11. Kf3 gxf5 12. Nh7 Qd1+ 13. Kg2 Qc2+
>                                    14. Kg1 Rg8+ 15. Ng5 Qxb3 (s=2)
>               14    15.95     -1   2. ... Ng3+!!
>               14    15.98     -3   2. ... Ng3+!!
>               14    16.28     -M   2. ... Ng3+!!
>               14     2:00 -Mat15   2. ... Ng3+ 3. Kg2 Qf1+ 4. Kxg3 Nf5+
>                                    5. Qxf5 Be1+ 6. Nxe1 Qxe1+ 7. Kg2 Qe2+
>                                    8. Kg3 Qxh2+ 9. Kf3 Qh1+ 10. Kg3 Qg1+
>                                    11. Kf3 gxf5 12. Nh7 Rxh7 13. Be3 Qg4+
>                                    14. Kf2 Rh2+ 15. Kf1 Qe2+ 16. Kg1 Qg2#
>?              14     2:00   2/42*  2. ... Qf1+
>Black(1): ?
>              time=2:10  cpu=187%  mat=3  n=511495719  fh=98%  nps=3.91M
>              ext-> chk=74357706 cap=273368 pp=604917 1rep=11881032 mate=93485
>              predicted=0  nodes=511495719  evals=6762150  50move=0
>              endgame tablebase-> probes=0  hits=0
>              SMP->  split=2604  stop=148  data=13/64  cpu=4:05  elap=2:10
>
>mate in 15 moves.

ChestUCI finds even #14:

ChestUCI Ver.4.0:
CPU: Celeron 400MHz
FEN: 4k2r/1p2np2/q3p1p1/b2pPnN1/3p1P2/PR3N2/2Q4P/R1B4K b k -
Search for Special-Mate [C2/R-2/K5/P6/X21] in 14 ...  (Hash=58MB)
  14	00:02	      99.349	47.535	+M14	2. ... Sg3+
Search completed ...  (Time=2.31s)
Mate in 14 found !  (00:02)
1... Ng3+ 2.Kg2 Qf1+ 3.Kxg3 Nf5+ 4.Qxf5 Be1+ 5.Nxe1 Qxe1+ 6.Kf3 Qh1+ 7.Kg3 Qxh2+
8.Kf3 Qh1+ 9.Kg3 Qg1+ 10.Kf3 gxf5 11.Bd2 Qg4+ 12.Kf2 Rh2+ 13.Kf1 Qg2+ 14.Ke1
Rh1#
1 Solution  (Mate in 14)

Regards,
Franz.

Re: hard position .... Mike Byrne 14:52:55 03/27/05
- Re: hard position .... F. Huber 16:46:46 03/27/05
  - Re: hard position .... Heiner Marxen 07:46:40 03/29/05

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