Author: Anthony Cozzie
Date: 10:53:22 09/29/02
Go up one level in this thread
On September 29, 2002 at 09:02:17, Charlie GOLD wrote: > > What machines find the mate? This is from Chess Life, Sep. 2002, page >42. > [D] 7K/7P/8/8/4Q2p/8/4R1rp/6rk w - - This one is pretty easy, even zappa finds it in less than a second. I'm sure it would find the shorter mate if it searched longer, but zappa stops when it finds 'a' mate - in this case mate in 8. Zappa requires 2 pieces [King + Something] on the board to test for null move so it has no problems. 1. Rxg2 Rxg2 2. Qxh4 Rg1 3. Qh3 = (4.85) Depth: 5 00:00:00.02 10kN 1. Rxg2 Rxg2 2. Qxh4 Rg1 3. Qh3 Ra1 = (4.85) Depth: 6 00:00:00.05 23kN 1. Rxg2 Rxg2 2. Qxh4 Rg1 3. Qh3 Rg2 4. Qe3 Rg1 = (4.85) Depth: 7 00:00:00.10 45kN 1. Rxg2 h3 2. Rxg1 Kxg1 3. Qe3 Kg2 4. Qe2 Kh1 5. Qa2 + (5.10) Depth: 8 00:00:00.12 56kN 1. Rxg2 h3 2. Rxg1 Kxg1 3. Qe3 Kg2 4. Qe2 Kh1 5. Qa2 + (6.60) Depth: 8 00:00:00.13 59kN 1. Rxg2 Re1 2. Rxh2 Kg1 3. Rh1 Kf2 4. Rxe1 h3 5. Kg7 + (13.60) Depth: 8 00:00:00.38 157kN 1. Rxg2 Rxg2 2. Qb1 Rg1 3. Qb7 Rg2 4. Qe4 h3 5. Qb1 Rg1 6. Qb7 Rg2 7. Qe4 Kg1 8. Qe1 = (99.84) Depth: 8 00:00:00.59 244kN Time: 594ms, Nodes: 244k, Quiescence Nodes: 44k [18%] Table Hits: 84k [34%], Table Pings: 107k [44%], NPS: 411k, Null Cuts: 0k Zappa 0.41, AMD 1900+, 128MB hash
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