Author: Will Singleton
Date: 19:51:58 11/10/99
Go up one level in this thread
On November 10, 1999 at 22:15:49, James Robertson 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) > >Here are Insomniac's thoughts, on my P233 4MB hash. It doesn't like the line you >give, instead thinking white should play Re1 instead of Rxd8. It does choose >your line briefly at ply 6, but scores it as bad for black.... > >James > > >Depth Score Time Nodes PV > 1 -3 50 89 Rxd1+ Rxd1 > 2 7 50 298 Rxd1+ Rxd1 Rc8 > 3 -10 220 3521 Rxd1+ Rxd1 Rd8 Re1 Re8 Bxc6 bxc6 > 4 -26 270 7519 Rxd1+ Rxd1 Rd8 Rd6 Rc8 Rd7 > 5> -58 600 58625 Rab8 Rxd8+ Rxd8 Na5 Rb8 Nxc6 bxc6 Rxa7 Rxb3 > 5> -49 760 83021 a6 Bxc6 bxc6 Rxd8+ Rxd8 f3 Ra8 Kf2 > 5 -49 870 96031 a6 Bxc6 bxc6 Rxd8+ Rxd8 f3 Ra8 Kf2 > 6> -113 1150 138477 Rxd1+ Rxd1 Rd8 Rxd8+ Nxd8 Nd6 b6 Nc8 Ne6 Nxa7 > 6> -45 1750 214380 Rab8 Re1 Rd7 Bxc6 bxc6 Nxe5 Bxe5 Rxe5 Rxb3 > 6 -45 2360 298414 Rab8 Re1 Rd7 Bxc6 bxc6 Nxe5 Bxe5 Rxe5 Rxb3 > 7 -64 4060 543668 Rab8 Rxd8+ Rxd8 b4 a6 Bxc6 bxc6 f3 Ra8 Kf2 > 8> -37 5930 809628 Rxd1+ Rxd1 Rd8 Re1 Re8 Nd6 Re7 Nxb7 Rxb7 Bxc6 >Rxb3 > 8 -37 6860 944892 Rxd1+ Rxd1 Rd8 Re1 Re8 Nd6 Re7 Nxb7 Rxb7 Bxc6 >Rxb3 > 9 -36 11700 1649846 Rxd1+ Rxd1 Rd8 Re1 Kf8 Be4 g6 f3 Re8 Bxc6 bxc6 >Kf2 >10 -45 22840 3183442 Rxd1+ Rxd1 Rd8 Re1 a6 Kf1 Rb8 Bxc6 bxc6 Nxe5 >Rxb3 Nd3 Kf8 >11 -55 51410 7233401 Rxd1+ Rxd1 Rd8 Re1 Kf8 b4 a6 Bxc6 bxc6 f3 Re8 >Ra1 Ra8 Kf2 >Check Extensions: 68625. >Recapture Extensions: 82190. >EGTB probes: 0, EGTB hits: 0 Hi James, Congrats on your performance in the Dutch tourney. Must have been quite an experience! btw, if you'd like me to open an ICC account for Insomniac, I can run it on this Athlon we've just got. Might be interesting to look at. Your ply 6 line (Rxd1...) just comes up short of seeing the bishop retaking the pawn, hence the bad score there. That's my problem at ply 7. But by ply 8, IF white plays Rxd8 instead of Re1, black should realize the bishop can recapture. If I increase my capture extensions I get this at ply 8, but it runs too slowly. Will
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