Author: leonid
Date: 15:27:11 09/29/01
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On September 29, 2001 at 14:42:10, Uri Blass wrote: >On September 29, 2001 at 07:33:59, leonid wrote: > >>Hello! >> >>This mate is probably very easy. There are good chance that you will solve it >>even by brute force wihtout too much waiting. >> >>[D]RQ2rqbb/4p2k/1KQQqQ1n/1R2qqpq/1P3P2/1BBPNN2/nq6/rq4QQ w - - >> >>Please indicate your result. >> >>Thanks, >>Leonid. > >Easy? >I do not understand why do you think that finidng mate in 11 is easy for chess >programs when there are so many possible moves that it is easy to get lost in >the wrong lines. It is true that this position will be not easy for every program but for few for sure. I saw very good branching factor (for brute force search) and expected that some programs with hash and quicker computer will do even better. 10 moves by brute force took 2 hours and 19 min to say no (Celeron 600Mhz, no hash). With hash and speedy computer, I expected that this position, even by brute force, could be solved 11 moves deep in some 20 or 25 min. With selective it should be expected to take only one or two seconds. Few program already found mate for similar positions in the past with branching factor very closed to mine, and more that in few occasions even better. Leonid. >Finding the mate is very hard for a lot of chess programs. >I tried the 2 programs that lead the ssdf for 5 minutes with no success. > >New position >RQ2rqbb/4p2k/1KQQqQ1n/1R2qqpq/1P3P2/1BBPNN2/nq6/rq4QQ w - - 0 1 > >Analysis by Deep Fritz: > >1.Nxe5! > -+ (-7.19) Depth: 1/36 00:00:00 554kN >1.Nxe5! Q5xf6 > -+ (-4.94) Depth: 1/41 00:00:27 23042kN >1.Bxe5! > -+ (-4.91) Depth: 1/41 00:00:29 25492kN >1.Bxe5! Rxb8+ 2.Qxb8 > -+ (-2.66) Depth: 1/41 00:00:46 39743kN >1.fxe5! > -+ (-2.62) Depth: 1/41 00:00:49 42594kN >1.fxe5! Rxb8+ 2.Rxb8 > -+ (-2.50) Depth: 1/41 00:00:53 45517kN >1.Rxe5! > -+ (-2.47) Depth: 1/41 00:01:23 72454kN >1.Rxe5! Rxb8+ 2.Rxb8 > -+ (-2.16) Depth: 1/41 00:01:56 102509kN >1.Rxe5 Rxb8+ 2.Rxb8 > -+ (-2.16) Depth: 2/39 00:02:11 116088kN > >(Blass, Tel-aviv 29.09.2001) >New position >RQ2rqbb/4p2k/1KQQqQ1n/1R2qqpq/1P3P2/1BBPNN2/nq6/rq4QQ w - - 0 1 > >Analysis by Gambit Tiger 2.0: > >1.Nxg5+ Qhxg5 > -+ (-5.94) Depth: 4 00:00:00 82kN >1.Nxg5+ Qhxg5 2.fxg5 Qxg1 3.g6+ Qfxg6 > -+ (-7.26) Depth: 4 00:00:00 122kN >1.Nxg5+ Qhxg5 2.Qxf5+ Q6xf5 3.Qcxe8 Qgxg1 4.Qxf8 Qxh1 5.Nxf5 exd6 > -+ (-12.48) Depth: 5 00:00:06 1235kN >1.Qxf5+ Q5xf5 2.Bxe6 Rxb8+ 3.Qxb8 Qxb8+ 4.Rxb8 > -+ (-10.06) Depth: 5 00:00:06 1335kN >1.Qxf5+ Qfxf5 2.Nxe5 Rxb8+ 3.Qxb8 Qxc6+ 4.Qxc6 Qxg1 5.Bxb2 Qxe3+ 6.Ka5 Bxe5 >7.fxe5 > -+ (-9.79) Depth: 6 00:00:09 1890kN >1.Qxf5+ > -+ (-8.89) Depth: 7 00:00:35 6795kN >1.Qxf5+ Qfxf5 2.Rxe5 Rxb8+ 3.Rxb8 Qxh1 4.Qxe7+ Bg7 5.Bxe6 > -+ (-7.92) Depth: 7 00:00:37 7142kN >1.Qxf5+ Qfxf5 2.Rxe5 Rxb8+ 3.Rxb8 Qxg1 4.Qxh5 Qxe3+ 5.Rxe3 Qxe3+ 6.Kb7 > -+ (-7.63) Depth: 8 00:01:19 14798kN >1.Qxf5+ > -+ (-6.73) Depth: 9 00:03:57 47088kN >1.Qxf5+ Qfxf5 2.Rxe5 Rxb8+ 3.Rxb8 Qxg1 4.Bxe6 Qgxh1 5.Qxe7+ Qff7 6.Qe4+ Nf5 >7.Bxf7 > -+ (-4.82) Depth: 9 00:04:39 55099kN > >(Blass, Tel-aviv 29.09.2001) > >Uri
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