Author: Vincent Lejeune
Date: 17:10:13 01/14/98
Go up one level in this thread
On January 14, 1998 at 19:49:10, Stuart Cracraft wrote: >On January 14, 1998 at 18:24:54, Vincent Lejeune wrote: > >>On January 14, 1998 at 18:07:45, Stuart Cracraft wrote: >> >>>On January 14, 1998 at 16:53:06, Vincent Lejeune wrote: >>> >>>>I've red a book chess problem, and find the following position : >>>> >>>>[Event "?"] >>>>[Site "?"] >>>>[Date "??.??.????"] >>>>[Round "?"] >>>>[White "W"] >>>>[Black "B"] >>>>[Result "*"] >>>>[WhiteElo "?"] >>>>[BlackElo "?"] >>>>[FEN "8/7p/6pP/k4pP1/b1p1pP2/KpPpP3/1P1P4/7Q w - - 0 1"] >>>> >>>> >>>>and the book say : >>>> >>>>If it's white to moves, black are in zugzwang because after : >>>>1.Qd1 B moves 2.Qxc3 cxb3 3.Kxd3 , the 2 passed pawn win for white !!! >>>>I don't understand everything in the position (and I don't blame who >>>>don't understand like me ;) ). >>>> >>>>I look for someone who can analyse this position with a strong chess >>>>program... >>>> >>> >>>Well, don't know about the "strong", but here's my program's analysis. >>> >>>K2 1/13/98 0.19 >>>Type ? for help. >>>Transposition table: Entries=100K Size=6400K >>>Pawn transposition table: Entries=31K Size=2000K >>>? set time 60 >>>? test solve ../tests/testone.ci >>>60 seconds per problem. >>>lejeune >>>Qd1 >>> >>>white >>>. . . . . . . . >>>. . . . . . . p >>>. . . . . . p P >>>k . . . . p P . >>>b . p . p P . . >>>K p P p P . . . >>>. P . P . . . . >>>. . . . . . . Q >>> >>>Phase = Middlegame, Target search time = 60 sec, Root score = 442 >>> 1+ 0.0 697 3 Qh4 >>> 1. 0.0 603 17 Qh4 >>> 2- 0.1 431 56 Qh4 >>> 2& 0.1 426 64 Qh4 Kb5 >>> 2& 0.1 427 78 Qc1 Kb5 >>> 2. 0.1 431 86 Qd1 Kb5 >>> 3+ 0.1 697 161 Qd1 >>> 3. 0.1 603 202 Qd1 Kb5 Qa1 >>> 4- 0.1 446 266 Qd1 >>> 4. 0.1 446 311 Qd1 Kb5 Qe1 Ka5 >>> 5+ 0.1 697 531 Qd1 >>> 5. 0.1 603 706 Qd1 Kb5 Qe1 Ka5 Qa1 Kb5 >>> 6- 0.1 431 915 Qd1 >>> 6& 0.1 430 1160 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 >>> 6. 0.1 430 1414 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qe1 Kb5 >>>Qa1 >>> 7& 0.2 430 1699 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qe1 Kb5 >>>Qa1 >>> 7. 0.2 430 1942 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qe1 Kb5 >>>Qa1 >>> 8& 0.2 434 2571 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qf1 >>> 8. 0.2 434 2884 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qf1 >>> 9& 0.2 434 3271 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qf1 >>> 9. 0.2 434 3688 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qf1 >>>10& 0.3 430 4817 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qe1 Kb5 >>>Qa1 >>>10. 0.4 430 11420 Qd1 Kb5 Qe1 Ka5 Qf1 Kb5 Qa1 Ka5 Qe1 Kb5 >>>Qa1 >>>11+ 0.9 507 27335 Qd1 >>>11. 1.0 503 30122 Qd1 Kb5 Qf1 Ka5 Qh1 Kb5 Qa1 Ka5 Qh1 >>>12- 2.2 427 70920 Qd1 >>>12& 2.3 425 72688 Qd1 Bb5 Qa1 Ba6 Qf1 Kb5 Qe1 Ka5 Qa1 Kb5 >>>Qb1 >>> Ka5 Qa1 >>>12. 2.3 425 72756 Qd1 Bb5 Qa1 Ba6 Qf1 Kb5 Qe1 Ka5 Qa1 Kb5 >>>Qb1 >>> Ka5 Qa1 >>>13& 2.8 430 92382 Qd1 Bb5 Qa1 Be8 Qe1 Ba4 Qf1 Bb5 Qe1 Be8 >>>Qa1 >>> Bd7 Qe1 Bb5 Qa1 >>>13. 2.9 430 98266 Qd1 Bb5 Qa1 Be8 Qe1 Ba4 Qf1 Bb5 Qe1 Be8 >>>Qa1 >>> Bd7 Qe1 Bb5 Qa1 >>>14& 3.4 430 116144 Qd1 Bb5 Qa1 Be8 Qe1 Bb5 Qf1 Be8 Qa1 Bd7 >>>Qe1 >>> Bb5 Qf1 Be8 Qa1 Bd7 Qe1 Bb5 >>>14. 6.6 430 214074 Qd1 Bb5 Qa1 Be8 Qe1 Bb5 Qf1 Be8 Qa1 Bd7 >>>Qe1 >>> Bb5 Qf1 Be8 Qa1 Bd7 Qe1 Bb5 >>>15& 8.2 430 277129 Qd1 Bb5 Qa1 Be8 Qe1 Bb5 Qf1 Be8 Qa1 Bd7 >>>Qe1 >>> Bb5 Qf1 Be8 Qa1 Bd7 Qe1 Be8 Qa1 >>>15. 19.7 430 710557 Qd1 Bb5 Qa1 Be8 Qe1 Bb5 Qf1 Be8 Qa1 Bd7 >>>Qe1 >>> Bb5 Qf1 Be8 Qa1 Bd7 Qe1 Be8 Qa1 >>>16& 23.8 430 855943 Qd1 Bb5 Qa1 Ba4 Qh1 Be8 Qf1 Bd7 Qe1 Be8 >>>Qb1 >>> Bb5 Qa1 Ba4 Qh1 >>>16. 41.3 430 1430961 Qd1 Bb5 Qa1 Ba4 Qh1 Be8 Qf1 Bd7 Qe1 Be8 >>>Qb1 >>> Bb5 Qa1 Ba4 Qh1 Bb5 Qa1 >>>17& 49.1 430 1722280 Qd1 Bd7 Qa1 Ba4 Qb1 Bb5 Qe1 Bd7 Qa1 Ba4 >>>Qb1 >>> Bb5 >>>17. 54.6 430 1930188 Qd1 Bd7 Qa1 Ba4 Qb1 Bb5 Qe1 Bd7 Qa1 Ba4 >>>Qb1 >>> Bb5 Qa1 Be8 Qb1 Bb5 >>>18. 60.0 430 2144013 Qd1 Bd7 Qa1 Ba4 Qb1 Bb5 Qe1 Bd7 Qa1 Ba4 >>>Qb1 >>> Bb5 Qa1 Be8 Qb1 Bb5 >>> >>>My move is : Qd1 >>>Time = 60.0 Rate=35730 Nodes=[1536201/607812/2144013] >>>Eval=431520 RptCnt=11112 NullCut=100569 >>>Extensions: Check=151557 Recapture=15205 Pawn=135 OneMove=0 >>> Threat=0 DeepSearch=0 Mate=0 >>>Material=[1600/1000] Worst=[-1080/97] >>>Hash: Success=26% Collision=66% >>>Hash Counts: ReadHits=446157, ReadProbes=1658921, WriteColl=326019, >>>WriteTries=493572 >>>Pawn Hash: Success=98% Collision=12% >>>Pawn Counts: ReadHits=853541, ReadProbes=862338, WriteColl=1095, >>>WriteTries=8797 >>> >>>black >>>. . . . . . . . >>>. . . . . . . p >>>. . . . . . p P >>>k . . . . p P . >>>b . p . p P . . >>>K p P p P . . . >>>. P . P . . . . >>>. . . Q . . . . >>> >>>+++ Qd1 Qd1 >>> >>>Correct so far: 1 Total problems: 1 Percent: 100% >>> >>>********* Grand totals ********** >>>Time = 60.0 Rate=35730 Nodes=[1536201/607812/2144013] >>>EvalCnt=431520 RptCnt=11112 NullCut=100569 >>>Extensions: Check=151557 Recapture=15205 Pawn=135 OneMove=0 >>> Threat=0 DeepSearch=0 Mate=0 >>>Hash: Success=26% Collision=66% >>>Pawn Hash: Success=98% Collision=12% >> >> >>So your program don't make any progress in the position !? > >Nothing that involves a queen sacrifice in 60 seconds. > >However, funny that you should send that. I am adding some >passed pawn logic tonight and we'll see if that helps. > >--Stuart It's a very hard positon to solve because : 1) You should see that no progress is possible until you sacrifice the queen 2) You should see that the endgame with two passed pawns against the bishop is win for white (that the book said, but it's the first thing to verify)
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