Author: Dann Corbit
Date: 01:12:07 12/09/03
Go up one level in this thread
On December 08, 2003 at 18:30:57, Steven Edwards wrote: >I've been testing Symbolic's low level search on the BWTC test suite. Althouh >the program can solve almost all of the 1,001 positions in a few seconds or less >each, there are a few holdouts. > >Specifically: > >(BWTC.0057 BWTC.0134 BWTC.0317 BWTC.0544 BWTC.0548 BWTC.0570 BWTC.0624 >BWTC.0640) > >resist solution even after up to 600 seconds wall time each on an 800 MHz PPC >G4. > >Here are the first two missed problems. Note that in both cases the key move >was selected, but then rejected for a better scoring move. Can these be >considered valid best move results? > >[D]2k4r/1pp1q1p1/2n1b3/1Q3p1p/2Pr2n1/6P1/3NPPBP/R4RK1 w - - > >(BWTC.0057: Qxb7+) > >[SI] [01] (1. Bxc6 bxc6) Score: -3.330 >[SI] [01] (1. Nb1) Score: -3.250 >[SI] [02] (1. Bxc6 bxc6) Score: -3.330 >[SI] [02] (1. Ra2 Nb8) Score: -3.250 >[SI] [02] (1. Ra8+) Score: -2.250 >[SI] [02] (1. Ra8+ Kd7 2. Rxh8 Rxd2 3. Qxb7 Rxe2 4. Rxh5 Bxc4 5. Rxf5) Score: >-0.500 >[SI] [03] (1. Ra8+ Kd7 2. Rxh8 Rxd2 3. Qxb7 Rxe2 4. Rxh5 Bxc4 5. Rxf5) Score: >-0.500 >[SI] [04] (1. Ra8+ Kd7 2. Rxh8 Rxd2 3. h3 Rxe2 4. hxg4 hxg4 5. Qxb7 Bxc4) >Score: -0.250 >[SI] [05] (1. Ra8+ Kd7 2. Rxh8 Rxd2 3. Qxb7 Rxe2 4. Rxh5 Bxc4 5. Rxf5) Score: >-0.500 >[SI] [06] (1. Ra8+ Kd7 2. Rxh8 Rxd2 3. Qxb7 Nge5 4. Rxh5 Rxe2) Score: -0.500 >[SI] [07] (1. Ra8+ Kd7 2. Rxh8 Rxd2 3. Qxb7 Nge5 4. Rxh5 Rxe2) Score: -0.500 >[SI] [07] (1. Nb3) Score: +0.500 >[SI] [07] (1. Nb3 Kd8 2. Bxc6 Rd6 3. Bxb7) Score: +1.000 >[SI] [08] (1. Nb3 Re4 2. Nc5 Qxc5 3. Qxc5 Rxc4 4. Qa3 Kd7) Score: +1.500 >[SI] [09] (1. Nb3) Score: +2.500 >[SI] [09] (1. Nb3 Re4 2. Nc5 Qxc5 3. Qxc5 Rxc4 4. Ra8+ Nb8 5. Qe7 Bd7 6. Qxg7) >Score: +2.500 >[SI] [09] (1. Qxb7+ Kxb7 2. Rfb1+ Kc8 3. Bxc6 Qa3 4. Rxa3 Kd8 5. Rb8+ Ke7 6. >Rxh8 Rxd2 7. Rxh5 Rxe2) Score: +2.750 >[SI] [10] (1. Qxb7+ Kxb7 2. Rfb1+ Qb4 3. Rxb4+ Kc8 4. Bxc6 Kd8 5. Rb8+ Ke7 6. >Rxh8 Rxd2 7. Rxh5 Rxe2) Score: +2.750 >[SI] [10] (1. Nb3 Nge5 2. Nxd4 Bxc4 3. Nxc6 bxc6 4. Ra8+ Kd7 5. Bxc6+ Kd6 6. >Qb4+ Ke6 7. Qxe7+ Kxe7 8. Rxh8 Nxc6 9. Rxh5 Bxe2 10. Rxf5 Bxf1 11. Kxf1) Score: >+2.912 >[SI] [11] (1. Nb3 Kd8 2. Ra8+ Bc8 3. Qxb7 Qe6 4. Nc5 Ke7 5. Qxc7+ Rd7 6. Nxe6 >Rxc7 7. Nxc7) Score: +3.750 >[SI] [11] (1. Bxc6) Score: +3.912 >[SI] [11] (1. Bxc6 bxc6 2. Qxc6 Kd8 3. Ra8+ Bc8 4. Rxc8+ Kxc8 5. Ra1 Qa3 6. >Rxa3) Score: +5.000 > >[D]r1bq1r2/ppp2pkp/3p2nn/2bN2NQ/2B1P3/8/PPp3PP/R1B2R1K w - - > >(BWTC.0134: Qxh6+) > >[SI] [01] (1. Bb3) Score: -2.000 >[SI] [01] (1. Bf4 Nxf4 2. Rxf4 c1=Q+ 3. Rxc1) Score: -1.080 >[SI] [02] (1. Bf4 Bb6 2. Nxb6 Nxf4 3. Rxf4 axb6) Score: -2.000 >[SI] [02] (1. Ne6+ fxe6 2. Bxh6+ Kg8 3. Bxf8 Nxf8) Score: -0.330 >[SI] [02] (1. Qxh6+) Score: -0.080 >[SI] [02] (1. Qxh6+ Kxh6 2. Nxf7+ Kh5 3. Nxd8 Rxd8 4. Nxc7) Score: Even >[SI] [03] (1. Qxh6+ Kxh6 2. Nxf7+ Kh5 3. Nxd8 Rxd8 4. Nxc7) Score: Even >[SI] [03] (1. Rxf7+) Score: +1.000 >[SI] [03] (1. Rxf7+ Rxf7 2. Qxh6+ Kxh6 3. Nxf7+ Kh5 4. Nxd8) Score: +2.250 >[SI] [04] (1. Rxf7+ Rxf7 2. Qxh6+ Kxh6 3. Nxf7+ Kh5 4. Nxd8) Score: +2.250 >[SI] [05] (1. Rxf7+ Rxf7 2. Qxh6+ Kxh6 3. Nxf7+ Kh5 4. Nxd8 c6) Score: +2.250 >[SI] [06] (1. Rxf7+ Rxf7 2. Qxh6+ Kxh6 3. Nxf7+ Kg7 4. Nxd8 c6 5. Nc7) Score: >+2.250 >[SI] [07] (1. Rxf7+ Rxf7 2. Qxh6+ Kxh6 3. Nxf7+ Kg7 4. Nxd8 c6 5. Nc7 Rb8) >Score: +2.250 >[SI] [07] (1. Qxh6+ Kxh6 2. Nxf7+ Kg7 3. Bh6+ Kg8 4. Nxd8 Rxd8 5. Nxc7+ d5 6. >Bxd5+ Rxd5 7. exd5) Score: +2.670 >[SI] [07] (1. Nxh7 Ng4 2. Nxf8 Kxf8 3. Rxf7+ Kxf7 4. Nxc7+ Ke7 5. Nxa8) Score: >+2.750 >[SI] [08] (1. Nxh7 Ng4 2. Nxf8 Kxf8 3. Qxg6 Nf2+ 4. Rxf2 Bxf2 5. Bg5 fxg6 6. >Bxd8 c1=Q+ 7. Rxc1) Score: +3.250 >[SI] [08] (1. Qxh6+ Kxh6 2. Nxf7+ Kg7 3. Bh6+ Kg8 4. Nxd8 Rxd8 5. Nxc7+ d5 6. >Bxd5+ Rxd5 7. exd5 c1=Q 8. Raxc1) Score: +3.670 >[SI] [09] (1. Qxh6+ Kxh6 2. Ne6+ Nf4 3. Nxd8 Rxd8 4. Bxf4+ Kh5 5. Nxc7 Rb8) >Score: +3.250 >[SI] [09] (1. Nxh7 Ng4 2. Nxf8 Kxf8 3. Qxg6 Ne5 4. Bh6+ Ke8 5. Qg8+ Kd7 6. Qxd8+ >Kxd8) Score: +4.000 >[SI] [10] (1. Nxh7 Ng4 2. Ng5 Nh6 3. Nh7) Score: +4.000 It took Chest 241 seconds on AMD 950 MHz to confirm that there are exactly two best solutions (direct mate in 9) for that problem. 1k1r4/1bp2p2/1p6/2r1PB1p/PQ4pP/6B1/5PP1/6K1 b - - acn 22816802; acs 241; bm Rc1+ Rd1+; ce 32750; dm 9; pv Rd1+ Kh2 Rcc1 Qf8+ Ka7 Qb8+ Kxb8 Bf4 Rh1+ Kg3 Rh3+ gxh3 Rg1+ Kh2 Rh1+ Kg3 Rxh3#;
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