Author: Alex Szabo
Date: 12:27:27 04/06/01
Go up one level in this thread
On April 06, 2001 at 04:08:59, Uri Blass wrote: >On April 05, 2001 at 23:52:19, Alex Szabo wrote: > >>On April 04, 2001 at 23:15:05, Robert Hyatt wrote: >> >>>On April 04, 2001 at 20:26:17, Stephane Daniel wrote: >>> >>>> >>>>Position 230 of the well known "Win At Chess" test suite. >>>> >>>>2b5/1r6/2kBp1p1/p2pP1P1/2pP4/1pP3K1/1R3P2/8 b - - 0 1 >>>> >>>>Right move is supposed to be Rb4 >>>> >>>> >>>>My program just can't solve this one. Is there an error in this particular test? >>>>What do your programs find for this position? Mine keeps telling me to play Rh7 >>>>with a score of -1.71 >>> >>> >>>It is the right move. But you have to evaluate passed pawns very highly to >>>get this one, as you really will not search it to a queen in any finite amount >>>of time, due to the checks. I have seen older versions of crafty solve it. >>>Someone reported that if you do "eval ppscale 200" then it will get it pretty >>>quickly... >> >>Rb4 does NOT win for black; it's a draw. > >Can you post the drawing line? > >Uri "Win at Chess" #230 main line (after 1... Rxb4) according to Szabo: 2. cxb4 a4 3. b5+ Kxb5 4. Ba3 c3 5. Re2! Kc4 6. f4 Kxd4 7. f5 exf5 8. e6 Kd3 9. e7 Bd7 10. Kf3 d4 11. Rh2 Kc4 12. Rh8 b2 13. Rb8 d3 14. Bxb2 cxb2 15. Rxb2 a3 16. Rb7 Be8 17. Ra7 Kb3 18. Ke3 a2 19. Kxd3 Kb2 20. Rb7+ Kc1 21. Ra7 = The key move for white to hold the game is Re2 with the plan of tying down the black bishop by generating a passed e (or g) pawn. Can you suggest a better move for black in this main line?
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