Author: John Merlino
Date: 18:04:43 06/17/02
Go up one level in this thread
On June 17, 2002 at 20:42:28, Jeremiah Penery wrote: >On June 17, 2002 at 20:16:01, John Merlino wrote: > >>Here's an amusing little Mate in 9 King chase that I had when testing >>Chessmaster 9000: >> >>[D]r6r/ppp1bQpp/2k1B1q1/4P3/4p3/2P1B3/PP3P1P/2K2R2 w - - 0 20 >> >>Chessmaster announces Mate in 10 in three seconds on my PIII-600, then switches >>to Mate in 9 after ten seconds: >> >>Time Depth Score Positions Moves >>0:00 1/3 5.29 2701 20.Qxe7 b6 21.Qd7+ Kb7 22.Bd5+ >> Kb8 23.Bxa8 Kxa8 24.Qxc7 >>0:00 1/3 5.65 5976 20.Rd1 b6 21.Qxe7 Kb7 22.Bd5+ Kb8 >> 23.Bxa8 Kxa8 24.Qxc7 >>0:00 1/4 5.19 11659 20.Rd1 b6 21.Qxe7 Rhd8 22.Rxd8 >> Rxd8 23.Qxd8 Qxe6 24.Qa8+ Kb5 25.Qxe4 >> Qxa2 26.Qxh7 >>0:01 2/5 14.85 74968 20.Rd1 b6 21.Bd5+ Kb5 22.Qxe7 Qd6 >> 23.exd6 Raf8 24.Bxe4 >>0:01 2/6 15.35 145320 20.Rd1 b6 21.Bd5+ Kb5 22.Qxe7 Qd6 >> 23.exd6 c6 24.c4+ Ka6 25.Bxc6 >>0:03 3/7 Mate10 374294 20.Rd1 b6 21.Bd5+ Kb5 22.Bc4+ Ka5 >> 23.Qxe7 c5 24.Qd7 a6 25.b4+ cxb4 >> 26.Rd5+ b5 27.Rxb5+ Ka4 28.Rxb4+ >> Ka5 29.Qa4# >>0:10 3/8 Mate09 1098190 20.Rd1 b6 21.Bd5+ Kb5 22.Bc4+ Ka5 >> 23.Qd5+ Bc5 24.Bxc5 Qg5+ 25.Kc2 >> Qd2+ 26.Rxd2 bxc5 27.Qxc5+ Ka4 >> 28.Qb4# >> >>Since four of the nine moves are not checking moves, can anybody else do better? > >Here's an interesting result. Not as fast as CM (almost 50 times slower, given >the hardware difference) to find mate, but it finds a shorter one. This is >modified Crafty 18.15 with singular extensions, AthlonXP 1600MHz: > >analyze.Black(1): r6r/ppp1bQpp/2k1B1q1/4P3/4p3/2P1B3/PP3P1P/2K2R2 w - - 0 20 > clearing hash tables > time surplus 0.00 time limit 30.00 (3:30) > nss depth time score variation (1) > 6 0.32 ++ 1. Rd1!! > 6 0.77 9.57 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 c5 4. > c4+ Ka6 5. Qb7+ Ka5 6. Bd2+ Ka4 7. > Bxe4 <HT> > 6-> 0.84 9.57 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 c5 4. > c4+ Ka6 5. Qb7+ Ka5 6. Bd2+ Ka4 7. > Bxe4 <HT> > 7 1.54 ++ 1. Rd1!! > 7 6.58 14.16 1. Rd1 b6 2. Bd5+ Kd7 3. Bb7+ Qd6 4. > Qf5+ Kd8 5. exd6 cxd6 6. Bxa8 Kc7 7. > Bd5 Kb8 8. Qxe4 > 7-> 6.78 14.16 1. Rd1 b6 2. Bd5+ Kd7 3. Bb7+ Qd6 4. > Qf5+ Kd8 5. exd6 cxd6 6. Bxa8 Kc7 7. > Bd5 Kb8 8. Qxe4 > 8 9.93 ++ 1. Rd1!! > 8 16.26 17.17 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 Qd6 4. > exd6 c6 5. c4+ Ka6 6. Bxc6 Rad8 7. > Qb7+ Ka5 8. Qxa7+ > 8-> 16.82 17.17 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 Qd6 4. > exd6 c6 5. c4+ Ka6 6. Bxc6 Rad8 7. > Qb7+ Ka5 8. Qxa7+ > 9 26.31 ++ 1. Rd1!! > 9 46.19 Mat09 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4. > Qxc7 Rac8 5. Bc4+ Ka4 6. Bb3+ Kb5 7. > Rd5+ Ka6 8. Bc4+ b5 9. Bxb5# > 9-> 48.39 Mat09 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4. > Qxc7 Rac8 5. Bc4+ Ka4 6. Bb3+ Kb5 7. > Rd5+ Ka6 8. Bc4+ b5 9. Bxb5# > 10 1:15 Mat08 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4. > Qxc7 Rac8 5. Bc4+ Ka4 6. Kb1 Rxc7 7. > b3+ Ka3 8. Bc1# > 10-> 1:21 Mat08 1. Rd1 b6 2. Bd5+ Kb5 3. Qxe7 a5 4. > > >Is the given line correct? It is correct! I guess I didn't let the analysis go long enough. It is a Mate in 8, which Chessmaster 9000 will announce in 1:48 on my PIII-600: Time Depth Score Positions Moves 0:00 1/3 5.29 2709 20.Qxe7 b6 21.Qd7+ Kb7 22.Bd5+ Kb8 23.Bxa8 Kxa8 24.Qxc7 0:00 1/3 5.65 5984 20.Rd1 b6 21.Qxe7 Kb7 22.Bd5+ Kb8 23.Bxa8 Kxa8 24.Qxc7 0:00 1/4 5.19 11667 20.Rd1 b6 21.Qxe7 Rhd8 22.Rxd8 Rxd8 23.Qxd8 Qxe6 24.Qa8+ Kb5 25.Qxe4 Qxa2 26.Qxh7 0:01 2/5 14.85 75172 20.Rd1 b6 21.Bd5+ Kb5 22.Qxe7 Qd6 23.exd6 Raf8 24.Bxe4 0:01 2/6 15.35 145579 20.Rd1 b6 21.Bd5+ Kb5 22.Qxe7 Qd6 23.exd6 c6 24.c4+ Ka6 25.Bxc6 0:04 3/7 Mate10 374470 20.Rd1 b6 21.Bd5+ Kb5 22.Bc4+ Ka5 23.Qxe7 c5 24.Qd7 a6 25.b4+ cxb4 26.Rd5+ b5 27.Rxb5+ Ka4 28.Rxb4+ Ka5 29.Qa4# 0:10 3/8 Mate09 1094329 20.Rd1 b6 21.Bd5+ Kb5 22.Bc4+ Ka5 23.Qd5+ Bc5 24.Bxc5 Qg5+ 25.Kc2 Qd2+ 26.Rxd2 bxc5 27.Qxc5+ Ka4 28.Qb4# 0:29 4/9 Mate09 3138341 20.Rd1 b6 21.Bd5+ Kb5 22.Bc4+ Ka5 23.Qd5+ Bc5 24.Bxc5 Qg5+ 25.Kc2 Qd2+ 26.Rxd2 bxc5 27.Qxc5+ Ka4 28.Qb5# 1:48 4/10 Mate08 12212845 20.Rd1 b6 21.Bd5+ Kb5 22.Qxe7 a5 23.Qxc7 Rac8 24.Bc4+ Ka4 25.Kb1 Rxc7 26.b3+ Ka3 27.Bc1# Sorry about that! jm
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