Author: Will Singleton
Date: 13:26:57 11/11/99
Go up one level in this thread
On November 10, 1999 at 23:16:48, Bruce Moreland wrote: >On November 10, 1999 at 20:32:58, Will Singleton wrote: > >>r2r2k1/pp3ppp/2n2b2/4p3/2N5/1PP2B2/1P3PPP/R2R2K1 b - - >> >>This position gives my program fits. Some stronger progs solve it easily. It >>appears to be a simple case of extending on captures, and then doing the qsearch >>right, which I apparently am not. >> >>Here's the main line which should be found: >>Rxd1 Rxd1 Rd8 Rxd8 Nxd8 Nd6 b6 Nc8 Bg5 Nxa7 Bc1 and gets the pawn back. >> >>It appears that you need 13 ply to see that the bishop can get the pawn back. >>Extending on a capture that brings material back to nominal, there are 2 >>extensions in the above main line, so you now need 11 ply. The qsearch reduces >>this to 10. And that's what my program needs, 10 ply. Seems too long. >> >>I would love to find this sooner without blowing up the tree. >> >>(from a game on ICC today, Postmodernist vs Amateur) > >How do you do on Bratko Kopec #22? > >2r2rk1/1bqnbpp1/1p1ppn1p/pP6/N1P1P3/P2B1N1P/1B2QPP1/R2R2K1 b - - 0 1 > >The key is Bxe4. If you have recapture problems it may take a while to find, >especially on a slow machine. > >bruce BK 22 seems ok. 2 -34 0.02 1338 40140 3 -2 0.08 2911 21780 Nh7 Bd4 Bf6 4 -12 0.22 8769 23880 Nh7 Bd4 Bf6 Nc3 5 -16 1.14 37714 30540 Re8 Bd4 e5 Bc3 Nc5 Nxc5 Qxc5 6 56 4.22 145350 33240 Bxe4 Bxe4 Qxc4 Qxc4 Rxc4 Nxb6 Rxe4 Nxd7 Will
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