Author: Richard Pijl
Date: 08:56:14 05/28/02
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On May 27, 2002 at 20:05:19, pavel wrote: >Hi, > >I don't know the proper English term for it but in Dutch it is called 'Dolle >Toren' (means something like mad rook) >Basically one party is in a stalemate position except for one rook. The party >with the rook tries to force his opponent to take the rook by giving continuous >check. Such a position could emerge from the following position (from a testgame >KnightX-Baron): > >[D]8/4kp1Q/5p2/4p3/5n2/3r4/r7/4R2K b - - > >The trap is 1..Rh3 2.Qxh3 Nxh3 3.Rxe5 and white continues to give check. >Much better would be 1..Kd6 and the trap is disabled. >The latest Crafty (18.15) cannot find the solution in a reasonable amount of >time (at least not on my machine (Mobile P-II 500Mhz), it's at ply 15 after 68 >minutes). >It's current pv: > >15 68:09 -5.31 1..Rb2 2.Qf5 Rh3+ 3.Qxh3 Nxh3 4.Rxe5+ Kd6 5.Rd5+ Kc6 6.Rd6+ Kb7 >7.Rxf6 Rf2 8.Rb6+ Kc7 9.Rc6+ Kd8 <HT> > The Baron is now improved and recognizes these type of positions very early on. The output of Baron follows below. It likes Rad2 a little better than Kd6: Baron version 0.32 beta 5, May 27, 2002 Copyright 2002 Richard Pijl Including 5-man Endgame Table Bases EGTB cache size is 16777216 bytes Transposition Hashtables set to 98304 kbytes Static Evaluation Hashtables set to 28672 kbytes Size of White book: 50529 entries Size of Black book: 65955 entries ply time nodes score pv 4& 0 4072 272 d3d2 e1g1 f4e2 g1f1 4& 0 6261 273 e7e6 h7h8 <HT> 4& 0 8136 278 a2a5 h1g1 d3d2 g1f1 4& 0 11511 300 a2a3 h7f5 d3h3 h1g1 a3a2 4. 0 13135 300 a2a3 h7f5 d3h3 h1g1 a3a2 5& 0 15209 292 a2a3 h7f5 d3h3 h1g1 a3g3 g1f1 5. 0 38747 292 a2a3 h7f5 d3h3 h1g1 a3g3 g1f1 6& 0 58802 286 a2a3 h7e4 d3h3 h1g1 a3g3 g1f1 g3f3 f1g1 f3a3 6& 0 188675 290 d3a3 e1b1 a2a1 h1g1 a1b1 h7b1 6& 1 215520 292 a2d2 h7h4 d2d1 h1h2 <HT> 6. 1 266362 292 a2d2 h7h4 d2d1 h1h2 <HT> 7& 1 305997 275 a2d2 h7h4 e7d7 h4g4 d7d8 g4f5 d3d6 f5h7 7& 1 436846 283 d3d2 h7h4 d2e2 e1d1 e2c2 d1g1 f4e2 7& 1 488512 284 a2a3 h7e4 <HT> 7. 2 851416 284 a2a3 h7e4 <HT> 8& 3 1033681 280 a2a3 h7e4 d3h3 h1g1 a3g3 g1f1 g3b3 e1c1 b3f3 f1g1 f4d3 8& 6 2016170 289 a2d2 h7f5 d2d1 e1d1 d3d1 h1h2 d1d3 h2g1 d3d2 8. 7 2635011 289 a2d2 h7f5 d2d1 e1d1 d3d1 h1h2 d1d3 h2g1 d3d2 9+ 8 2870235 319 a2d2 <HT> 9& 8 2881471 319 a2d2 <HT> 9& 15 5137601 323 e7d6 h7e4 d3h3 h1g1 a2g2 e4g2 f4g2 e1d1 d6e7 g1g2 h3a3 g2f2 9. 17 5947428 323 e7d6 h7e4 d3h3 h1g1 a2g2 e4g2 f4g2 e1d1 d6e7 g1g2 h3a3 g2f2 10& 22 7415723 338 e7d6 h7e4 d3h3 h1g1 a2g2 e4g2 f4g2 g1g2 h3a3 e1e2 d6e7 e2f2 10& 40 12340373 339 a2d2 h7e4 <HT> 10. 53 15517384 339 a2d2 h7e4 <HT> 11& 69 19281654 341 a2d2 h7e4 d3h3 h1g1 d2g2 e4g2 f4g2 g1g2 h3a3 g2f2 a3a4 11. 278 67007770 341 a2d2 h7e4 d3h3 h1g1 d2g2 e4g2 f4g2 g1g2 h3a3 g2f2 a3a4 12& 351 88043668 339 a2d2 h7e4 d3h3 h1g1 d2g2 e4g2 f4g2 g1g2 h3d3 g2f2 <HT>
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