Author: Uri Blass
Date: 09:12:27 10/10/01
Go up one level in this thread
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. Uri
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