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Subject: Re: Test position - Mate-in-23 (even #21)

Author: F. Huber

Date: 10:49:52 08/28/05

Go up one level in this thread


On August 28, 2005 at 13:32:23, Mike Byrne wrote:

>Crafty Classic 2005
>
>Black(1): [d]8/2K1p3/8/3P4/8/8/pp6/kn4R1 w - -
>White(1): st 60000
>search time set to 60000.00.
>White(1): g
>              time surplus  40.00  time limit 1000:00 (1000:00)
>              depth   time  score   variation (1)
>               14->   0.50   2.03   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 Nb5+ 7. Kd7 Nd4
>                                    8. Rc4 (s=3)
>               15     0.52     +1   1. Re1!!
>               15     0.58   2.99   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kb6 Kb2 (s=2)
>               15->   0.74   2.99   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kb6 Kb2 (s=2)
>               16     0.91   2.87   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kd6 Qh6+ 9. Kc5 Kb2
>               16->   1.25   2.87   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kd6 Qh6+ 9. Kc5 Kb2 (s=3)
>               17     1.47   2.88   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qe1 8. Rd3 Qe5+ 9. Qd6 Qxd6+ 10. Rxd6
>                                    Kb2 (s=2)
>               17->   1.82   2.88   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qe1 8. Rd3 Qe5+ 9. Qd6 Qxd6+ 10. Rxd6
>                                    Kb2 (s=2)
>               18     1.86     +1   1. Re1!!
>               18     2.14   3.46   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kb6 Qb1+ 9. Kc5 Qf5+ 10. Kb4
>                                    Kb2 11. Rb3+ Kc2
>               18->   2.68   3.46   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kb6 Qb1+ 9. Kc5 Qf5+ 10. Kb4
>                                    Kb2 11. Rb3+ Kc2 (s=2)
>               19     3.83   3.44   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kb6 Qe4 9. Ka5 Qe5+ 10. Kb4
>                                    <HT>
>               19->   4.99   3.44   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qh7+ 8. Kb6 Qe4 9. Ka5 Qe5+ 10. Kb4
>                                    <HT> (s=2)
>               20     7.60   3.62   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qe1 8. Rc5 Qg3+ 9. Kc8 Qh3+ 10. Kb7
>                                    Qb3+ 11. Qb6 Qxb6+ 12. Kxb6 Kb2 13.
>                                    Rb5+ Kc3
>               20->  11.36   3.62   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qe1 8. Rc5 Qg3+ 9. Kc8 Qh3+ 10. Kb7
>                                    Qb3+ 11. Qb6 Qxb6+ 12. Kxb6 Kb2 13.
>                                    Rb5+ Kc3 (s=2)
>               21    18.52     -1   1. Re1
>               21    23.57   2.78   1. Re1 e5 2. d6 e4 3. d7 e3 4. d8=Q
>                                    e2 5. Rxe2 Nc3 6. Rc2 b1=Q 7. Rxc3
>                                    Qe1 8. Rc5 Qg3+ 9. Kc6 Qf3+ 10. Rd5
>                                    Qc3+ 11. Kd7 Qh3+ 12. Ke7 Qa3+ 13.
>                                    Ke6 Kb2
>               21    46.28     +1   1. Rh1!!
>               21    46.88     +3   1. Rh1!!
>               21    51.24   6.21   1. Rh1 e5 2. d6 e4 3. d7 e3 4. d8=B
>                                    e2 5. Bh4 e1=Q 6. Bxe1 Na3 7. Bf2+
>                                    Nb1 8. Bg1 Nc3 9. Bd4+ Nb1 10. Rh2
>                                    Na3 11. Kd8 Kb1 12. Rxb2+ Kc1 13. Rxa2
>               21->  51.24   6.21   1. Rh1 e5 2. d6 e4 3. d7 e3 4. d8=B
>                                    e2 5. Bh4 e1=Q 6. Bxe1 Na3 7. Bf2+
>                                    Nb1 8. Bg1 Nc3 9. Bd4+ Nb1 10. Rh2
>                                    Na3 11. Kd8 Kb1 12. Rxb2+ Kc1 13. Rxa2
>                                    (s=3)
>               22    59.63   6.21   1. Rh1 e5 2. d6 e4 3. d7 e3 4. d8=B
>                                    e2 5. Bh4 e1=Q 6. Bxe1 Na3 7. Bf2+
>                                    Nb1 8. Bg1 Nc3 9. Bd4+ Nb1 10. Rh2
>                                    Na3 11. Kd8 Kb1 12. Rxb2+ Kc1 13. Rxa2
>                                    (s=2)
>               22->   1:39   6.21   1. Rh1 e5 2. d6 e4 3. d7 e3 4. d8=B
>                                    e2 5. Bh4 e1=Q 6. Bxe1 Na3 7. Bf2+
>                                    Nb1 8. Bg1 Nc3 9. Bd4+ Nb1 10. Rh2
>                                    Na3 11. Kd8 Kb1 12. Rxb2+ Kc1 13. Rxa2
>                                    (s=3)
>               23     1:41     +1   1. Rh1!!
>               23     1:43     +3   1. Rh1!!
>               23     1:58   8.01   1. Rh1 e5 2. d6 e4 3. d7 e3 4. d8=B
>                                    e2 5. Bh4 e1=Q 6. Bxe1 Na3 7. Bf2+
>                                    Nb1 8. Bg1 Nc3 9. Bd4+ Nb1 10. Rh2
>                                    Na3 11. Rxb2 Nc2 12. Rxc2+ Kb1 13.
>                                    Rh2 a1=Q 14. Rh1+ Ka2 15. Bxa1 (s=2)
>               23->   3:20   8.01   1. Rh1 e5 2. d6 e4 3. d7 e3 4. d8=B
>                                    e2 5. Bh4 e1=Q 6. Bxe1 Na3 7. Bf2+
>                                    Nb1 8. Bg1 Nc3 9. Bd4+ Nb1 10. Rh2
>                                    Na3 11. Rxb2 Nc2 12. Rxc2+ Kb1 13.
>                                    Rh2 a1=Q 14. Rh1+ Ka2 15. Bxa1 (s=3)
>               24     3:24     +1   1. Rh1!!
>               24     3:26     +3   1. Rh1!!
>               24     3:27     +M   1. Rh1!!
>               24     4:07  Mat23   1. Rh1 e5 2. d6 e4 3. d7 e3 4. d8=B
>                                    e2 5. Bh4 e1=Q 6. Bxe1 Na3 7. Bf2+
>                                    Nb1 8. Bg1 Nc3 9. Bd4+ Nb1 10. Rh2
>                                    Na3 11. Rxb2 Nc4 12. Rb8+ Nb2 13. Bxb2+
>                                    <EGTB> (s=2)
>?              24     4:33   2/21*  1. Rg3
>White(1): ?
>              time=4:40  mat=0  n=270139659  fh=94%  nps=962K
>              ext-> chk=27485463 cap=332900 1rep=1303310 mate=67072
>              predicted=0  nodes=270139659  evals=77685778  50move=0
>              endgame tablebase-> probes=385120  hits=385120
>              SMP->  split=4571  stop=386  data=8/64  elap=4:40
>
>mate in 23 moves.

ChestUCI finds even a shorter one:

ChestUCI Ver.4.2:
CPU: Celeron 400MHz
FEN: 8/2K1p3/8/3P4/8/8/pp6/kn4R1 w - -
Position-Analysis:  C0/R0/K1/P1/X2
Search for Special-Mate [C0/R0/K3/P2/X6] in 21 ...  (Hash=32MB)
  21	00:16	   1.753.062	119.990	+M21	1.Th1
Search completed ...  (Time=25.27s)
Mate in 21 found !  (00:25)
1.Rh1 e5 2.d6 e4 3.d7 e3 4.d8B e2 5.Bh4 e1Q 6.Bxe1 Na3 7.Bf2+ Nb1 8.Bg1 Na3
9.Bd4+ Nb1 10.Rh2 Na3 11.Rxb2 Nc4 12.Rb3+ Nb2 13.Bc3 Kb1 14.Rxb2+ Kc1 15.Rxa2
Kd1 16.Rf2 Kc1 17.Kc6 Kd1 18.Kc5 Kc1 19.Kc4 Kd1 20.Kb3 Kc1 21.Rf1#
1 Solution  (Mate in 21)

Regards,
Franz.




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