Author: John Merlino
Date: 10:25:40 12/31/05
Go up one level in this thread
On December 31, 2005 at 06:36:25, George Tsavdaris wrote: >On December 30, 2005 at 22:26:15, Zappa wrote: > >>On December 30, 2005 at 20:14:04, George Tsavdaris wrote: >> >>>On December 30, 2005 at 19:59:30, Will Singleton wrote: >>> >>>>Some computer just played this move against amateur on ICC, worked, but I wonder >>>>if it's really sound. >>>> >>>>r3kb1r/pp3ppp/2p5/q3n1B1/3pN3/5Q1P/PPP2PP1/R4RK1 w kq - bm Nf6+? >>> >>>A quick/small analysis gives that all variations result in a white win but one >>>leads to a white being better but Q+2P Vs 2R not very easy....: >>> >>>1. Nf6+ gxf6 2. Qxf6 Kd7 3. Rad1 Bg7 (3... Re8 4. Rxd4+ Kc8 5. Qxh8 Nf3+ 6. >>>gxf3 Qxg5+ 7. Rg4 Qd5 8. Qd4 $18) (3... Rg8 4. Rxd4+ Kc7 5. Bf4 Kb6 6. Bxe5 Re8 >>>7. Bg3 Rg7 8. Rfd1 Rxg3 9. fxg3 Bc5 10. R1d3 $18) 4. Rxd4+ Kc7 5. Qe7+ Kb8 6. >>>Rfd1 Nf3+ 7. gxf3 Bxd4 8. Rxd4 Rg8 9. Kh2 Qxg5 10. Rd8+ Rxd8 11. Qxg5 Kc7 12. >>>Qf4+ Kb6 13. Qxf7 $16 * >>> >>>The best line gives: >>>r2r4/pp3Q1p/1kp5/8/8/5P1P/PPP2P1K/8 b - - 0 13 >> >>After Bg7 why not Qxg7, intending >> >>1. Nf6+ gxf6 2. Qxf6 Kd7 3. Rad1 Bg7 4. Qxg7 Rag8 5. Qf6 Nf3+ (Rxg5 6. f4 Rhg8 >>7. Rxd4) 6. Qxf3 Qxg5 7. Rxd4+ Kc8 > >Zappa played the the moves with different order. First 4...Nf3 and then >5...Rag8. >that means your line with Qxg7 leads to: >1. Nf6+ gxf6 2. Qxf6 Kd7 3. Rad1 Bg7 4. Qxg7 Nf3 5.gxf3 Rag8 and now 6.Qxf7 is >the best but that leads to a worse position that my 4.Rxd4 does..... > >Please correct me if i'm wrong...... > >PS:Notice that the 7. Qxf7 Qxg5+ 8. Rg4 Qd8 9. Re1 h5 10. Rxg8 Rxg8+ 11. Kh2 Rf8 >doesn't work well due to the attack on the somewhat exposed white King.... First, to comment on George's main line, CM9_R1 says that after 4.Rxd4 Kc7 5.Qe7+, Black should play 5...Kc8, and the score is not very convincing for White, compared to scores after the 4.Qxg7 line: Time Depth Score Positions Moves 0:00 1/3 -0.24 1926 5...Kb8 6.Bf4 Qc7 0:00 1/4 -0.33 6247 5...Kb8 6.Rfd1 Rc8 7.Rd8 Qc7 0:00 1/5 -0.19 19003 5...Kb8 6.Rfd1 Rc8 7.Rd8 Qc7 8.Qb4 0:00 1/6 0.85 47845 5...Kb8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Bf4+ Kc8 9.Rxd4 Rd8 10.Rxd8+ Qxd8 11.Qxf7 0:00 1/7 1.30 104526 5...Kb8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Bf4+ Kc8 9.Qxf7 Rd8 10.Qe6+ Rd7 11.Rxd4 0:00 1/7 0.93 164969 5...Kc8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Rxd4 Rg8 9.h4 Qc7 0:02 1/8 -0.06 551019 5...Kc8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Rxd4 Qc7 9.Qe4 Rg8 10.f4 0:05 1/9 0.03 1297152 5...Kc8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Rxd4 Qc7 9.Qe4 Rg8 10.h4 h6 0:12 1/10 0.02 3309633 5...Kc8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Rxd4 Qc7 9.Qe4 Rg8 10.Qf5+ Kb8 11.Kf1 c5 12.Bf4 0:22 1/11 0.59 6024873 5...Kc8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Rxd4 Rg8 9.Qd7+ Kb8 10.Rg4 a6 11.Bf4+ Ka7 12.Qxf7 Qe1+ 13.Kg2 Rxg4+ 14.hxg4 0:41 1/12 0.73 11780049 5...Kc8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Rxd4 Qc7 9.Qe4 Qa5 10.h4 h6 11.Bxh6 Qxa2 12.Qe5 Rg8+ 13.Bg5 1:24 1/13 1.21 24061872 5...Kc8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Rxd4 Rg8 9.Kh1 Qxg5 10.Rd8+ Rxd8 11.Qxg5 Kc7 12.Qf4+ Rd6 13.Qxf7+ Rd7 14.Qf4+ Rd6 15.Qf5 Also on that main line, The King prefers 9.Rg4 over 9.Kh2: Time Depth Score Positions Moves 0:00 1/4 1.37 22348 9.f4 a6 10.Rd7 Ra7 11.Qxf7 0:00 1/5 0.85 48288 9.f4 a6 10.Rd7 Ra7 11.Kh2 Qf5 0:00 1/5 1.12 82889 9.h4 a6 10.Rd7 Qb5 11.Kh2 Qxb2 12.Qxf7 0:00 1/5 1.29 85668 9.Kh2 Qxg5 10.Rd8+ Rxd8 11.Qxg5 Kc7 12.Qf4+ Rd6 13.Qxf7+ Rd7 0:00 1/6 1.35 103368 9.Kh2 Qxg5 10.Rd8+ Rxd8 11.Qxg5 Kc7 12.Qf4+ Kb6 13.Qxf7 0:00 1/6 1.79 207610 9.Rg4 Kc8 10.Bh4 Rh8 11.Rg7 Qc7 0:01 1/7 1.73 278746 9.Rg4 Kc8 10.Bf4 Qd8 11.Rxg8 Qxg8+ 12.Kh2 Qd8 13.Qxf7 h5 14.Qf5+ Qd7 15.Qxh5 0:02 1/8 2.05 608764 9.Rg4 Kc8 10.Bf6 Rxg4+ 11.fxg4 b5 12.Be5 Qd8 13.Qxf7 Qd7 0:05 1/9 1.77 1437335 9.Rg4 Kc8 10.Bf4 Qd8 11.Rxg8 Qxg8+ 12.Kh2 Qd8 13.Qxf7 b6 14.Qxh7 Qd7 15.Qg8+ Kb7 0:13 1/10 2.12 3716988 9.Rg4 Kc8 10.Bf4 Qd8 11.Qxf7 Rf8 12.Qxh7 a5 13.Kg2 a4 14.Be5 Qd7 15.Qg7 Qxg7 16.Rxg7 0:31 1/11 2.11 8717170 9.Rg4 Kc8 10.Qxf7 Qd5 11.Qxh7 Rf8 12.Bf4 Qd8 13.Bg3 c5 14.Rg5 Qd1+ 15.Kh2 1:14 1/12 2.41 21131657 9.Rg4 Kc8 10.Qxf7 Qd5 11.Qxh7 Rf8 12.Bf4 Qd8 13.Bg3 Rh8 14.Qf5+ Qd7 15.Qxd7+ Kxd7 16.Rg7+ Ke6 17.Rxb7 Rxh3 18.Kg2 Finally, CM9_R1 also prefers 4.Qxg7 (this is on a P4-2.4): Time Depth Score Positions Moves 0:00 1/3 2.74 1775 4.Rxd4+ Kc8 5.Qxg7 Re8 6.Qxh7 Qxa2 0:00 1/4 2.61 5442 4.Rxd4+ Kc8 5.Qxg7 Re8 6.Bf6 Qc5 0:00 1/5 2.93 17839 4.Rxd4+ Kc8 5.Qxg7 Re8 6.Qf6 Qc5 7.c3 0:00 1/6 2.80 75317 4.Rxd4+ Kc7 5.Qxg7 Rhg8 6.Qf6 Kb6 7.Rfd1 Rae8 0:00 1/7 0.99 191192 4.Rxd4+ Kc7 5.Qe7+ Kb8 6.Rfd1 Nf3+ 7.gxf3 Bxd4 8.Bf4+ Kc8 9.Rxd4 Rd8 10.Rxd8+ Qxd8 11.Qxf7 0:02 1/8 1.50 596573 4.Rxd4+ Kc7 5.Qxg7 Rag8 6.Qxe5+ Qxe5 7.Bf4 f6 8.Bxe5+ fxe5 9.Re4 0:05 1/9 1.94 1190170 4.Rxd4+ Kc7 5.Qxg7 Rag8 6.Qf6 Rxg5 7.b4 Nf3+ 8.Qxf3 Qf5 9.Rf4 0:11 1/10 1.72 2737072 4.Rxd4+ Kc7 5.Qxg7 Rag8 6.Qxe5+ Qxe5 7.Bf4 f6 8.Bxe5+ fxe5 9.Ra4 a6 10.Re1 0:21 1/10 2.18 4899527 4.Qxg7 Rag8 5.Qf6 Rxg5 6.Qxh8 Qd5 7.f3 d3 8.Kh1 d2 9.Qxh7 Ng6 0:56 1/11 2.55 12473466 4.Qxg7 Rag8 5.Qf6 Rxg5 6.f4 Rgg8 7.fxe5 Kc8 8.Rxd4 Rd8 9.Rfd1 Rxd4 10.Rxd4 2:03 1/12 2.43 27820307 4.Qxg7 Nf3+ 5.gxf3 Rag8 6.Qxf7+ Kc8 7.f4 h6 8.b4 Qd8 9.Qe6+ Kb8 10.Qe5+ Qc7 11.Qxc7+ Kxc7 12.h4 hxg5 13.hxg5 jm
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