Author: chandler yergin
Date: 20:36:27 04/11/05
Go up one level in this thread
On April 11, 2005 at 13:00:10, Rob Basham wrote: >On April 11, 2005 at 12:24:18, John Merlino wrote: > >>On April 11, 2005 at 09:05:39, chandler yergin wrote: >> >>>On April 11, 2005 at 05:41:59, pavel wrote: >>> >>>>On April 10, 2005 at 20:52:17, John Merlino wrote: >>>> >>>>>On April 10, 2005 at 19:55:40, Rob Basham wrote: >>>>> >>>>>>[D]2r1r2k/4R1pp/pb6/1p6/2nqN1QB/P5PP/1PB4K/5R2 w - - 0 1 >>>>>> >>>>>> >>>>>>White mates in about 9 or 14... >>>>>> >>>>>>Best move is.. >>>>>> >>>>>>Qf5, Bf6, or Rxe8+.....? >>>>>> >>>>>>Thanks >>>>>> >>>>>>Rob >>>>>> >>>>>>Thanks to John Merlino for your help on these test diagrams...:-) >>>>> >>>>>It takes exactly one minute for CMX Yoda v25 on a P4-2.4 to announce Mate in 9 >>>>>with Bf6: >>>>> >>>>>Time Depth Score Positions Moves >>>>>0:00 1/3 10.52 4465 1.Bf6 Rxe7 2.Bxd4 Rd8 >>>>>0:00 1/4 10.39 9920 1.Bf6 Rxe7 2.Bxd4 Rd8 3.Qf3 >>>>>0:00 1/5 10.54 51151 1.Bf6 Rxe7 2.Bxd4 Rd8 3.Qg5 Red7 >>>>>0:00 1/5 12.04 189663 1.Qf5 Qe5 2.Rxe5 Nxe5 3.Nd6 Rxc2+ >>>>> 4.Qxc2 >>>>>0:01 1/6 13.31 312119 1.Qf5 Qe5 2.Rxe5 Nxe5 3.Nd6 Rxc2+ >>>>> 4.Qxc2 Rb8 5.Qe4 Ng6 >>>>>0:03 1/7 14.55 858973 1.Qf5 Qd5 2.Rxe8+ Rxe8 3.Qxd5 Ne3 >>>>> 4.Qf7 Nxf1+ 5.Qxf1 Bd4 6.Qf7 >>>>>0:11 1/8 16.40 2967418 1.Qf5 Qe5 2.Rxe5 Nxe5 3.Nd6 Rxc2+ >>>>> 4.Qxc2 Rb8 5.Nc8 Ng6 6.Nxb6 Nxh4 >>>>> 7.gxh4 >>>>>0:30 1/9 17.20 8063147 1.Qf5 Qe5 2.Rxe5 Nxe5 3.Nd6 Rxc2+ >>>>> 4.Qxc2 Rg8 5.Qf5 Bc5 6.Qxe5 Bxd6 >>>>> 7.Qxd6 a5 >>>>>1:00 1/9 Mate09 16434288 1.Bf6 Rxe7 2.Bxd4 Rg8 3.Ng5 Ne5 >>>>> 4.Qe4 Ng6 5.Qxe7 h6 6.Nf7+ Kh7 >>>>> 7.Bxg6+ Kxg6 8.Qe4+ Kh5 9.Qg4# >>>>>1:04 1/10 Mate09 17702274 1.Bf6 Rxe7 2.Bxd4 Rg8 3.Ng5 Ne3 >>>>> 4.Qe4 Nxf1+ 5.Kg2 Ne3+ 6.Bxe3 g6 >>>>> 7.Qxe7 Rg7 8.Qf8+ Rg8 9.Nf7# >>>>>1:34 1/11 Mate09 27485404 1.Bf6 Rxe7 2.Bxd4 Rg8 3.Ng5 Ne3 >>>>> 4.Qe4 Nxf1+ 5.Kg2 Ne3+ 6.Bxe3 g6 >>>>> 7.Qxe7 Rg7 8.Qf8+ Rg8 9.Nf7# >>>>> >>>>>It appears that both Rxe8+ and Qf5 are Mates in about 15 moves. >>>>> >>>>>jm >>>> >>>> >>>>Only Junior finds this mate faster. >>> >>>For comparison, here's Shredder >>>Finds Mate >>>Depth: 15/36 00:00:43 15751kN >>>Now that's fast.. >>> >>> >>> >>> >>>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. >>jm > >Thanks John.. > >Looks like Bf6 is the best move...:-) > >Rob
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