Author: John Merlino
Date: 13:30:34 01/06/02
Go up one level in this thread
On January 06, 2002 at 14:45:04, Jeroen van Dorp wrote:
>[D]8/8/1n6/7P/2p5/2P5/p1K5/k7 w - - 0 1
>
>White to move and win.
>
>After trying to solve it myself I quickly came to the conclusion that this was
>an easy one, just steaming up with the pawn to h8, promote and checkmate. The
>black knight is helpless.
>When I checked the solution with a lot of ches engines I was pleased to find
>that -what's new- *I* had overlooked a clever move (as usual combined with a
>minor promotion) and that some chess engines had great difficulty in determining
>the right solution.
>
>The move 2...Nxc3 is crucial, as well as the solution to that move 3.h8R
>
>1. h6 Nd5 2. h7 Nxc3 3. h8=R (3. h8=Q {stalemate}) 3... Nb1 4. Rh1 c3 5. Rh4
>Na3+ 6.Kxc3 {from now on five men tablebase} 6... Nb1+ 7. Kc2 Na3+ 8. Kb3 Nb1 9.
>Rh2 Nd2+ 10. Rxd2 Kb1 11. Rd1# 1-0
>
>*Fritz 7* didn't find the shortest move from the start position. It was a
>special case walking through the variations. It jumped up and down and two and
>fro between alternative moves, from mate in 30 to mate in two, from equal
>position to advantage for white.
>*Fritz 7 (No MMX)* didn't do the job as well, yet was less jumpy in it's
>analysis.
>*Fritz 5.32* couldn't find the right solution as well (from the start) and
>*Fritz 6* came to the same conclusions as 5.32.
>*Shredder 6* was the only to find the solution immediately, and recognized the
>mate in 11 and the minor promotion from the startposition.
>*Junior 7* found it too after a short diversion, as did Gandalf 5.
>Also *Hiarcs 7.32* took some time, but found it quite rapidly.
>*Gambit Tiger 14* and *Chess Tiger 14* didn't find the minor promotion when
>analysing the start position, and stuck to 0.00 and 3.h8Q?
>It was also hard to convince *Nimzo 8*. It understood white to be winning, but
>couldn't find the mate quickly (or at all, I cut off the analysis after a few
>minutes)
>*Rebel Century 4.0* had no trouble finding the right move, the conclusion that
>white is on a winning streak, and the minor promotion, however the mate sequence
>wasn't found quickly. After 3 minutes 50 seconds it told me mate in 13.
>
>*Goliath Light 1.5* took 8 secs to draw the right conclusion.
>*Comet B37* took some 18 seconds to tell me a mate in 10, but that maybe because
>a different way to count until mate.
>And *Crafty 18.12* needed 7 seconds.
>*Yace 0.99.56* (I hope I didn't forget an essential number in it's name) found
>it in the blink of an eye (mate in 11)
>*SOS* did'n't see the minor promotion in it's analysis from the start position
>and gave it a big fat 0.00
>When loading Pepito v1.42 my machine crashed so...
>
>
>...then I got bored.
>
>J.
>
>all on PIII@840MHz
CM8000 (on a PIII-733) finds the underpromotion in one second, but doesn't find
the Mate in 11 until 0:37....
Time Depth Score Positions Moves
0:00 8/9 0.00 10459 1. h6 Nd5 2. h7 Nxc3 3. h8=Q
0:00 9/10 0.00 20756 1. h6 Nd5 2. h7 Nxc3 3. h8=Q
0:01 10/11 0.03 56858 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh3 c3 5. Rd3 Nd2 6. Rxc3 Ne4
7. Ra3
0:01 11/12 0.29 127201 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh3 c3 5. Kb3 c2 6. Kxc2 Nd2
7. Kxd2 Kb2
0:03 12/13 3.13 312271 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh1 c3 5. Rh4 Nd2 6. Kxc3 Nb1+
7. Kc2 Nd2 8. Kxd2 Kb2 9. Rb4+ Ka3
0:06 13/14 0.36 834881 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh3 c3 5. Kb3 Nd2+ 6. Kxc3 Ne4+
7. Kb3 Nd2+ 8. Kc2 Nf1 9. Ra3 Nd2
10. Kxd2 Kb2
0:11 14/15 3.26 1713301 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh3 c3 5. Kb3 Nd2+ 6. Kxc3 Ne4+
7. Kb3 Nd2+ 8. Kc2 Nf1 9. Rh6 Nd2
10. Kxd2 Kb2 11. Rb6+ Ka3 12. Kc2
0:21 15/16 3.57 3460509 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh1 c3 5. Rh4 Nd2 6. Kxc3 Nb1+
7. Kc2 Nd2 8. Rd4 Nb1 9. Kb3 Na3
10. Kxa3
0:37 16/17 Mate11 6005373 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh1 c3 5. Rh4 Nd2 6. Kxc3 Nb1+
7. Kc2 Nd2 8. Rd4 Nb1 9. Kb3 Na3
10. Rd2 Nb1 11. Rxa2#
0:46 17/18 Mate11 7176117 1. h6 Nd5 2. h7 Nxc3 3. h8=R Nb1
4. Rh1 c3 5. Rh4 Nd2 6. Kxc3 Nb1+
7. Kc2 Nd2 8. Rd4 Nb1 9. Kb3 Na3
10. Rd2 Nb1 11. Rxa2#
jm
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