Author: Will Singleton
Date: 23:24:54 12/31/04
Go up one level in this thread
On December 31, 2004 at 18:47:03, Anthony Cozzie wrote: >[d]r7/4kppp/4pn2/P7/3R4/qr6/3B1PPP/3Q1K1R b - - bm Rab8 > >The first one is pretty easy: > >1... Ra8-b8 2. Bd2-f4 Qa3xa5 3. Bf4-d6 Ke7-e8 4. Bd6xb8 Qa5-b5 5. Kf1-e1 Rb3-b1 >6. Bb8-f4 Rb1xd1 7. Ke1xd1 > = (0.65) Depth: 10/26 00:00:06.95 7125kN (1025 KN/s, 285 splits, 19 aborts) >1... Ra8-b8 2. Bd2-f4 Qa3xa5 3. Bf4xb8 Qa5-b5 4. Kf1-e1 Rb3-b1 5. Bb8-d6 Ke7-e8 >6. f2-f3 Rb1xd1 7. Rd4xd1 Nf6-d5 8. Rd1-d2 Qb5-b1 9. Rd2-d1 > = (1.22) Depth: 14/36 00:01:04.01 89710kN (1401 KN/s, 1136 splits, 101 aborts) > >I was a little skeptical, but it does seem like Black can win. If I go down the >tree a bit the score improves to almost 2.0. The above position is very hard for most programs. You must have made some improvements since zappa 0.8, since my copy takes 4 minutes (ply 12) on a p4 2.8ghz to find it. > >[d]rr6/4kppp/3qpn2/8/P1Rp4/1P6/3B1PPP/3Q1K1R b - - bm Qa3 > >This one is pretty hard, partially because Zappa keeps changing its mind :( > >1... e6-e5 2. f2-f3 Ke7-f8 3. Kf1-f2 e5-e4 4. Bd2-c3 Nf6-g4 5. f3xg4 Qd6-f4 6. >Kf2-g1 Qf4-e3 7. Kg1-f1 d4xc3 8. Qd1-e2 Qe3-f4 9. Qe2-f2 Qf4-c1 > = (0.27) Depth: 15/39 00:07:18.35 538477kN (1228 KN/s, 1358 splits, 129 aborts) >1... Ke7-f8 2. Kf1-g1 Kf8-g8 3. b3-b4 Nf6-e4 4. Bd2-e1 Rb8-d8 5. a4-a5 Qd6-d5 6. >Qd1-d3 Ra8-c8 7. Rc4xc8 Rd8xc8 8. f2-f3 Rc8-c1 > = (0.48) Depth: 15/39 00:09:31.17 705530kN (1235 KN/s, 1414 splits, 133 aborts) >1... Qd6-a3 2. g2-g3 e6-e5 3. Qd1-e1 Qa3xb3 4. Qe1xe5 Ke7-f8 5. Qe5xd4 Qb3-f3 6. >Rh1-g1 Rb8-d8 7. Qd4-c5 Kf8-g8 8. Bd2-e1 Nf6-g4 9. Rg1-g2 Rd8-d1 > = (0.58) Depth: 15/39 00:12:16.78 927828kN (1259 KN/s, 1551 splits, 136 aborts) > >Not exactly a winning score :) > >From your diagrams I guess the game continued Qa3 Rxd4 Rxb3 a5. Zappa does not >really agree with Rxd4, so your opponent may have helped out a bit here. Kf8 >and e5 both seem like reasonable alternatives, but I suspect Qa3 is the >strongest. You peeked at the game, I think. :) Anyway, alternatives to Rxd4 exist, but Qa3 still applies more pressure, I think.
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