Author: John Merlino
Date: 21:23:30 04/11/05
Go up one level in this thread
On April 11, 2005 at 23:36:27, chandler yergin wrote: >On April 11, 2005 at 13:00:10, Rob Basham wrote: > >>On April 11, 2005 at 12:24:18, John Merlino wrote: >>>>New game, >>>>[D]2r1r2k/4R1pp/pb6/1p6/2nqN1QB/P5PP/1PB4K/5R2 w - - 0 1 >>>> >>>>Analysis by Shredder 8: >>>> >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bc3 Be3 >>>> +- (9.95) Depth: 5/16 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 >>>> +- (9.95) Depth: 6/19 00:00:00 >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 5.Kg2 >>>> +- (10.04) Depth: 7/18 00:00:00 59kN >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.b3 Nd5 5.Qg5 Re5 >>>> +- (10.13) Depth: 8/20 00:00:00 130kN >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Nf6 Nd2 4.Rf5 Re2+ 5.Rf2 Nf1+ 6.Kg2 Rxf2+ 7.Kxf2 Ne3 >>>> +- (10.20) Depth: 9/20 00:00:01 259kN >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.Nd6 Na4 5.Nxe8 Rxe8 >>>> +- (10.45) Depth: 10/26 00:00:01 488kN >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Bxb6 Nxb6 4.Nd6 Re2+ 5.Kg1 Nd5 6.Nxe8 Rg2+ 7.Kxg2 Nf4+ >>>>8.gxf4 >>>> +- (10.95) Depth: 10/26 00:00:01 527kN >>>>1.Bf6 Rxe7 2.Bxd4 Ra8 3.Qh4 Re6 4.Nc3 h6 5.Bxg7+ Kg8 6.Bxh6 Nxb2 7.Qg4+ Rg6 >>>>8.Bxg6 >>>> +- (15.46) Depth: 10/34 00:00:04 1467kN >>>>1.Bf6 Rxe7 2.Bxd4 Rg8 3.Bxb6 Nxb6 4.Nd6 h6 5.Qg6 Nc4 6.Nf7+ Rxf7 7.Qh7# >>>> +- (15.70) Depth: 11/32 00:00:07 2343kN >>>>1.Bf6 Rxe7 2.Bxd4 Rg8 3.Ng5 Ne3 4.Bxe3 Bc7 5.Nf7+ Rxf7 6.Rxf7 >>>> +- (15.95) Depth: 12/41 00:00:14 4606kN >>>>1.Bf6 Rxe7 2.Bxd4 Rg8 3.Ng5 Ne3 4.Bxe3 Bc7 5.Nf7+ Rxf7 6.Rxf7 Be5 >>>> +- (16.45) Depth: 12/41 00:00:14 4749kN >>>>1.Bf6 Qxf6 2.Nxf6 Bg1+ 3.Kxg1 Rg8 4.Nxg8 Nxb2 5.Qxg7# >>>> +- (#152) Depth: 12/42 00:00:22 7641kN >>>>1.Bf6 Rxe7 2.Bxd4 Rd8 3.Qh4 Ree8 4.Nc3 Re2+ 5.Nxe2 h6 6.Kh1 Rxd4 7.Rf8# >>>> +- (#152) Depth: 13/18 00:00:23 7840kN >>>>1.Bf6 Rxe7 2.Bxd4 Rd8 3.Qh4 Bxd4 4.Qxe7 Rg8 5.Rf8 Bg1+ 6.Kxg1 Nd6 7.Qxd6 b4 >>>>8.Rxg8+ Kxg8 9.Qd8+ Kf7 >>>> +- (#150) Depth: 14/40 00:00:43 15586kN >>>>1.Bf6 Rxe7 2.Bxd4 Rd8 3.Qh4 Bxd4 4.Qxe7 Rg8 5.Rf8 Bc5 6.Nxc5 Nd6 7.Qxd6 b4 >>>>8.Rxg8+ Kxg8 9.Qe6+ Kf8 10.Nd7# >>>> +- (#150) Depth: 15/36 00:00:43 15751kN >>>>1.Bf6 Rxe7 2.Bxd4 Rd8 3.Qh4 h5 4.Qxe7 Ne5 5.Qxe5 Bxd4 6.Qxh5+ Kg8 7.Bb3+ Rd5 >>>>8.Bxd5# >>>> +- (#150) Depth: 16/38 00:00:47 17089kN >>>>1.Bf6 Rxe7 2.Bxd4 Rce8 3.Qf5 Kg8 4.Ng5 g6 5.Qd5+ Re6 6.Rf8+ Kxf8 7.Qf3+ Ke7 >>>>8.Qb7+ Bc7 9.Qxc7+ Kf8 10.Qg7# >>>> +- (#150) Depth: 17/36 00:00:49 17858kN >>>> >>>>(, 11.04.2005) >>> >>>Shredder's output is incredibly bizarre here. The position is a Mate in 9, but >>>not a single PV shows mate in 9 moves (although there are mates shown in 10, 7 >>>and even 5 moves!??). >>> >>>Conclusion: Shredder found the best move, but did NOT conclusively find the mate >>>in 9. > >THe Mate in 9 is not forced; Shredder gave all the variations leading to >Mate after the Key Move. > >With "Best PLay" by Black it's Mate in 9. > >If Black errs.. he gets Mated sooner. I understand that, but Shredder's output still makes no sense at all. What do you mean by "Shredder gave all the variations leading to Mate after the Key Move"? Take, for example, the next-to-last PV from Shredder: 1.Bf6 Rxe7 2.Bxd4 Rd8 3.Qh4 h5 4.Qxe7 Ne5 5.Qxe5 Bxd4 6.Qxh5+ Kg8 7.Bb3+ Rd5 8.Bxd5# Even this is not correct, because if Black plays 2...Rd8, then White has a Mate in 5 (total of 7 moves from the initial position). Shredder is clearly wrong in its output, although I am impressed at the speed at which it found the best move. jm
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