Author: Frederic Friedel
Date: 07:01:03 04/13/00
Go up one level in this thread
On April 12, 2000 at 22:42:27, Christophe Theron wrote: >Incidentally, someone posted a position some time ago. It was a mate in 8. It >involved an underpromotion to a Knight at move 2 or 3 (I don't remember >exactly). > >Junior6 was able to solve this, so I deduce that it is able to handle >underpromotions correctly. It is an improvement over Junior5, which failed on >underpromotions problems. > > >I think I have found the position. Mate in 8 involving underpromotion to knight: > >[D]r7/p1pRpP1n/K3Pp1b/5B1n/4NkP1/2B5/2N1Pp2/1b6 w - - > Christophe, I ran it on Fritz (will do so with Junior as soon as my other computer is connected) and got the following. I have cut the initial plies to save bandwidth. On a PII-400 with 64 MB Hash Fritz6 takes 03:57 min to see the mate in eight, underpromotions and all. After that the rest is resolved in seconds. Underpromotion problem [D]r7/p1pRpP1n/K3Pp1b/5B1n/4NkP1/2B5/2N1Pp2/1b6 w - - 0 1 Analysis by Fritz 6: 1.Bc3-d2+ Kf4-e5 2.Ne4xf2 Bb1xc2 3.Bd2-c3+ Ke5-f4 +- (4.47) Depth: 8/31 00:00:01 470kN 1.Ne4xf2! +- (4.50) Depth: 8/31 00:00:01 607kN 1.Ne4xf2 Nh7-g5 2.Nc2-d4 c7-c5 3.Bc3-d2+ Kf4-g3 4.Nf2-h1+ Kg3-h2 5.g4xh5 c5xd4 +- (4.56) Depth: 9/30 00:00:08 3412kN 1.Bc3-d2+! +- (4.59) Depth: 9/30 00:00:08 3453kN 1.Bc3-d2+! Kf4-e5 2.Ne4xf2 Bb1xc2 3.Bd2-c3+ Ke5-f4 4.Bf5xc2 Nh7-f8 5.g4xh5 Nf8xd7 +- (4.88) Depth: 9/32 00:00:12 4970kN 1.Bc3-d2+ Kf4-e5 2.Ne4xf2 Bb1xc2 3.Bd2-c3+ Ke5-f4 4.Bf5xc2 Nh7-f8 5.g4xh5 Nf8xd7 +- (4.72) Depth: 10/35 00:00:24 10192kN 1.Ne4xf2! +- (4.75) Depth: 10/38 00:00:34 14399kN 1.Ne4xf2! Nh5-g7 2.Bf5xh7 Ng7xe6 3.Rd7xe7 Ne6-g5 4.Bc3-d2+ Kf4-g3 5.Bd2xg5 f6xg5 +- (5.00) Depth: 10/38 00:00:44 18211kN 1.Ne4xf2 Nh7-g5 2.Nc2-d4 Bb1xf5 3.Nd4xf5 Nh5-g3 4.Bc3-d2+ Kf4-e5 5.Nf2-d3+ Ke5xe6 +- (5.06) Depth: 11/33 00:01:18 31941kN 1.Bc3-d2+! +- (5.09) Depth: 11/33 00:01:19 32251kN 1.Bc3-d2+! Kf4-e5 2.Ne4xf2 Bb1xc2 +- (5.31) Depth: 11/39 00:01:40 41841kN 1.Bc3-d2+! +- (5.63) Depth: 12/39 00:03:26 88500kN 1.Bc3-d2+! Kf4-e5 2.Bd2-a5 Ra8-c8 3.f7-f8N Nh7xf8 +- (#8) Depth: 12/39 00:03:57 102298kN ------------------ 2.Bd2-a5 Ra8-c8 3.Ne4xf2 Bb1xc2 4.Ba5-c3+ Ke5-f4 5.Bf5xc2 Nh5-g3 6.Bc2xh7 Ng3xe2 +- (4.78) Depth: 10/34 00:00:15 6322kN 2.Bd2-a5! +- (5.09) Depth: 11/33 00:00:35 15395kN 2.Bd2-a5! Ra8-c8 3.f7-f8N Nh7xf8 +- (#7) Depth: 11/34 00:00:52 21819kN ------------------ 3.Ne4xf2! Bb1xc2 4.Ba5-c3+ Ke5-f4 5.Bf5xc2 Nh5-g3 6.Rd7xe7 Ng3xe2 +- (5.38) Depth: 9/28 00:00:04 2171kN 3.f7-f8N! +- (5.41) Depth: 9/33 00:00:09 4287kN 3.f7-f8N! Nh7xf8 +- (#6) Depth: 9/33 00:00:09 4376kN ------------------ 4.Ne4xf2 Bb1xc2 5.Ba5-c3+ Ke5-f4 6.Bf5xc2 Nf8xe6 7.Bc3-d2+ Kf4-g3 8.Nf2-e4+ Kg3xg4 ² (0.50) Depth: 7/20 00:00:00 129kN 4.Ba5-c3+! +- (#5) Depth: 7/31 00:00:00 181kN
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