Author: Uri Blass
Date: 14:12:34 10/10/01
Go up one level in this thread
On October 10, 2001 at 17:02:42, Dann Corbit wrote: >On October 10, 2001 at 12:12:27, Uri Blass wrote: > >>On October 10, 2001 at 12:02:11, John Merlino wrote: >> >>>On October 09, 2001 at 18:09:06, Dann Corbit wrote: >>> >>>>On October 09, 2001 at 13:01:13, Uri Blass wrote: >>>> >>>>>[D]8/1P6/8/5k2/2K4p/7r/1r4p1/6R1 b - - 0 61 >>>>> >>>>>This position is from the game Tao-Deep Junior7 in the last WMCCC >>>>> >>>>>Chest need some hours on p200 to see mate in 10(I used chest by the way that was >>>>>explained by paul some days ago >>>>> >>>>>see http://www.icdchess.com/forums/1/message.shtml?191857 >>>>> >>>>>Solution:61...Rg3 62.Kd4 h3 63.Kd5 h2 64.b8Q Rxb8 65.Re1 Rd3+ 66.Kc4 h1Q 67.Re5+ >>>>>Kxe5 68.Kxd3 Qd1+ 69.Kc3 Rb3+ 70.Kc4 Qc2# >>>>> >>>>>15961 seconds,292,407,791 nodes >>>>> >>>>>In the game Deep Junior7 missed the right move(Rg3) but it did not help Tao that >>>>>resigned after Rxb7. >>>>> >>>>>How much time does your program need to see mate in 10 with the full 5 piece >>>>>tablebases and without tablebases? >>>> >>>>Here is the CM8000 verbose explanation: >>>>"Analysis: You move your rook to g3, which moves it behind the passed pawn at >>>>g2. White counters with rook to d1. Your rook captures pawn, which removes the >>>>promote threat at b7. White responds by moving rook to d5, which checks your >>>>king. You move your king to e4, which moves it out of check. White counters by >>>>moving the rook to d4, which checks your king. You move your king to e5, which >>>>moves it out of check. White responds by moving rook to d5, which checks your >>>>king. You move your king to e6, which moves it out of check. White replies by >>>>moving the rook to d1. You move your rook to c7, which checks White's king. >>>>White responds with the king to b4, which moves it out of check. You move your >>>>pawn to g1 with a queen promotion, which threatens White's rook. White counters >>>>with rook captures queen. Your rook captures rook. White responds by moving king >>>>to a3. You move your pawn to h3, which pushes the passed pawn. White responds by >>>>moving the king to a4. You move your pawn to h2, which adds a promote threat at >>>>h2. White counters by moving the king to a5. You move your pawn to h1 with a >>>>queen promotion. >>>> >>>>As a result of this line of play, you win a rook and a pawn. Additionally, you >>>>gain a queen through promotion. Also, White's King is driven away from the >>>>middle of the board. With this material, you should be able to force a mate." >>>> >>>>Here is the SAN output for CM8000: >>>>Time Depth Score Positions Moves >>>>9:09 10/11 -20.85 91605523 1...Rg3 2. Rd1 Rxb7 3. Rd5+ Ke4 4. Rd4+ Ke5 5. Rd5+ >>>>Ke6 6. Rd1 Rc7+ 7. Kb4 g1=Q 8. Rxg1 Rxg1 9. Ka3 h3 10. Ka4 h2 11. Ka5 h1=Q >>> >>>Very amusing that you put the text analysis in there. I don't think I've ever >>>seen anybody else bother to do that on this board. >>> >>>Here's what I got with CM8000 on a PIII-733 (default personality, 32MB hash) >>> >>>Time Depth Score Positions Moves >>>0:00 3/4 -11.28 3940 1...Rg3 2. Kd4 h3 3. b8=Q Rxb8 >>>0:00 4/5 -11.60 14839 1...Rg3 2. Kc5 h3 3. Kd4 Rb4+ 4. >>> Kd5 Rxb7 >>>0:00 5/6 -11.79 38085 1...Rg3 2. Kc5 h3 3. Kd4 Rb4+ 4. >>> Kc5 Rxb7 5. Kd4 >>>0:02 6/7 -13.99 149165 1...Rg3 2. Rxg2 Rgxg2 3. Kd5 h3 >>> 4. Kd4 h2 5. b8=Q Rg4+ 6. Ke3 Rxb8 >>>0:04 7/8 -14.23 418052 1...Rg3 2. Rxg2 Rgxg2 3. Kd5 Rgd2+ >>> 4. Kc6 h3 5. Kc5 Rxb7 >>>0:15 8/9 -15.92 1834376 1...Rg3 2. Rxg2 Rgxg2 3. Kd5 h3 >>> 4. b8=Q Rxb8 5. Kc6 h2 6. Kc7 Rg7+ >>> 7. Kxb8 h1=Q >>>1:44 9/10 -18.15 12919471 1...Rg3 2. Rd1 Rxb7 3. Rd5+ Ke4 >>> 4. Rd4+ Ke5 5. Rd5+ Kf6 6. Rd1 >>> h3 7. Kc5 h2 8. Kc6 h1=Q 9. Rd6+ >>> Ke5 >>>4:54 10/11 -20.83 35997947 1...Rg3 2. Rd1 g1=Q 3. Rxg1 Rxg1 >>> 4. b8=Q Rxb8 5. Kd4 h3 6. Kc5 Rc1+ >>> 7. Kd4 h2 8. Ke3 Re8+ 9. Kd4 h1=Q >>>28:16 11/12 -Mate11 202470478 1...Rg3 2. b8=Q Rxb8 3. Kc5 h3 >>> 4. Kd5 h2 5. Re1 g1=Q 6. Re5+ Kg6 >>> 7. Re6+ Kf7 8. Kc4 Qc1+ 9. Kd4 >>> Qc3+ 10. Kd5 h1=Q+ 11. Kd6 Rd3# >>> >>>At least it chose the right move the whole time.... >>> >>>jm >> >>I believe that using bigger selectivity is better for finding mates faster. >>I always use ss=10 for chessmaster6000 because I believe based on my experience >>that ss=10 is simply faster in finding mates than ss=6. >> >>I do not have chessmaster8000 so I can only guess that ss=10 is better for mates >>problem. > >Here is output for CM8000 with SS=10. I don't think it helps in this case. > >Time Depth Score Positions Moves >8:39 10/11 -20.85 91605523 1...Rg3 2. Rd1 Rxb7 3. Rd5+ Ke4 4. Rd4+ Ke5 > 5. Rd5+ Ke6 6. Rd1 Rc7+ 7. Kb4 g1=Q 8. Rxg1 > Rxg1 9. Ka3 h3 10. Ka4 h2 11. Ka5 h1=Q > > >I didn't wait for final solution. I know that in chessmaster6000 I get in endgames a difference of 5 in the depthes and not a difference of 1 after changing the selective search from 6 to 10. Depth 10/11 in endgame is typical for selective search=6 in chessmaster6000. It is also possible that big hash tables halped my chessmaster6000(I used 128 mbytes hash tables on the p850) Uri
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